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1.
Odovtos (En línea) ; 25(3): 32-42, Sep.-Dec. 2023. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia, SaludCR | ID: biblio-1529067

RESUMO

Abstract The aim of this study was to compare the filling capacity in curved root canal using a new continuous wave of condensation technique (Termo Pack II, Easy Dental Equipments, Brazil) or lateral compaction. The percentage of voids in the filling of mesial root canals of mandibular molars was assessed by micro-computed tomography (micro-CT). Mesial root canals (n=24) of mandibular molars with a degree of curvature between 20° and 40° were prepared using rotary system (ProDesign Logic, Easy, Brazil) up to #35, .05 taper. The root canals were filled by using the continuous wave of condensation system or lateral compaction and AH Plus sealer (n=12). Scanning at 9 µm was performed after preparation and after filling by using micro-CT SkyScan 1176. The volumetric percentage of filling material and voids (total length and in each root canal third) were calculated. Data were analyzed using ANOVA/ Tukey and Student's t tests (α=0.05). Before the filling techniques, the root canals volume after preparation was similar (p>0.05). The root canals filled by the continuous wave of condensation technique presented the lowest percentage of voids, and the greatest percentage of filling material in total length and thirds (cervical, middle and apical) (p<0.05). Both techniques were not able of completely filling the root canals. The continuous wave of condensation technique Termo Pack II promoted better root canal filling in curved root canals, when compared with lateral compaction.


Resumen El objetivo de este estudio fue comparar la capacidad de obturación en conductos radiculares curvos utilizando una nueva técnica de condensación de onda continua (Termo Pack II, Easy Dental Equipments, Brasil) vs compactación lateral. El porcentaje de brechas en la obturación de los conductos radiculares mesiales de los molares mandibulares se evaluó mediante microtomografía computarizada (micro-CT). Se prepararon conductos radiculares mesiales (n=24) de molares mandibulares con un grado de curvatura entre 20° y 40° utilizando un sistema rotatorio (ProDesign Logic, Easy, Brasil) al #35, conicidad 0,05. Los conductos radiculares se obturaron utilizando un sistema de condensación de onda contínua o compactación lateral y cemento AH Plus (n=12). Se realizó un escaneo de 9 µm después de la preparación y después de la obturación usando el micro-CT SkyScan 1176. Se calculó el porcentaje volumétrico de material de obturación y vacíos (longitud total y en cada tercio del conducto radicular). Los datos se analizaron utilizando las pruebas ANOVA/Tukey y t de Student (α=0,05). Antes de las técnicas de obturación, el volumen de los conductos radiculares después de la preparación fue similar (p>0,05). Los conductos radiculares obturados con la técnica de condensación por onda contínua presentaron el menor porcentaje de vacíos y el mayor porcentaje de material de obturación en longitud total y en tercios (cervical, medio y apical) (p<0,05). Ambas técnicas no fueron capaces de llenar completamente los conductos radiculares. La técnica de condensación de onda contínua Termo Pack II promovió un mejor relleno del conducto radicular en conductos radiculares curvos en comparación con la compactación lateral.


Assuntos
Obturação do Canal Radicular/instrumentação , Condensação , Polpa Dentária , Microtomografia por Raio-X/instrumentação
2.
Braz. j. oral sci ; 22: e231400, Jan.-Dec. 2023. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1524336

RESUMO

Aim: This study aimed to assess the shaping ability of Reciproc Blue in the apical third and apical foramen of moderately curved canals at different working lengths (WLs), by micro-computed tomography. Methods: Thirty-six mesial roots (mesiobuccal and mesiolingual canals) were included, each with 2 separate root canals and independent apical foramina, according to type IV of Vertucci's classification of first and second mandibular molars. The canals were instrumented at three different WLs: G-1, 1mm short of the major apical foramen; G0, at the major apical foramen; G+1, 1mm beyond the major apical foramen. The groups were assessed for changes in root canal volume and untouched wall area in the apical third. Groups G0 and G+1 were also compared for percentage of untouched walls at the apical foramen. One-way ANOVA (post hoc Tukey test) and Student's t-test adopted a 5% level of significance. Results: Root canal volumes (mm3) in the apical third were 22.86±10.46, 44.48±24.91, and 55.71±21.32 in G-1, G0 and G+1, respectively. G-1 volume following instrumentation increased significantly less than that of G0 or G+1 (P>.05); G0 did not differ from G+1. The percentage of untouched wall area in the apical third did not differ among the three groups (P>.05). G0 and G+1 did not differ regarding untouched walls in the major apical foramem walls. Conclusion: Extending the WL from 1mm short of the apical foramen to a point at and beyond the WL increases the apical third volume without increasing the prepared area. Untouched surface areas of the apical foramen were not modified by instrumentation at or beyond the foramen


Assuntos
Periodontite Periapical , Tratamento do Canal Radicular , Ápice Dentário , Cavidade Pulpar , Microtomografia por Raio-X
3.
São José dos Campos; s.n; 2023. 58 p. ilus, tab.
Tese em Português | BBO - Odontologia | ID: biblio-1531598

RESUMO

O objetivo deste estudo foi avaliar a efetividade de preparo do canal radicular utilizando instrumentos reciprocantes com indicações semelhantes e diferentes conicidades. Foram selecionados 30 dentes humanos extraídos, separados aleatoriamente em 3 grupos: grupo WaveOne Gold (WG), grupo R-Motion (RM) e grupo Reciproc Blue (RB). Foram realizados procedimentos de acesso, exploração e preparo dos canais radiculares com dois instrumentos, separadamente, em cada uma das amostras, utilizando instrumentos de calibres semelhantes e diferentes conicidades de cada sistema: WaveOne Gold Primary (#25/.07) e WaveOne Gold Medium (#35/.06) (WaveOne Gold ­ Dentsply Sirona); R-Motion 25 (#25/.06) e R-Motion 40 (#40/.04) (R-Motion - FKG Dentaire); e R25 (#25/.08) e R40 (#40/.06) (Reciproc Blue ­ VDW). Cada amostra foi submetida a três escaneamentos por microtomografia computadorizada, pré-operatório e após cada preparo com os instrumentos selecionados, para identificar superfícies de preparo não tocadas, grau de transporte do canal e mensuração de alterações nos volumes total e apical do canal radicular. Os resultados indicam que não houve diferença estatística significativa em nenhum dos parâmetros avaliados entre os grupos. Entretanto, apenas o grupo R-Motion evidenciou uma diminuição significativa na porcentagem de áreas não tocadas após a segunda instrumentação. Os resultados demonstram que, mesmo com a utilização de instrumentos com calibre semelhante e menor conicidade, foram obtidos resultados satisfatórios, abrangendo as mensurações de volume e área total do canal radicular, grau de transporte e capacidade de centralização (AU)


The purpose of this study is to evaluate the effectiveness of root canal shaping procedure, using reciprocating instruments with similar indication and different taper sizes. Thirty extracted human teeth were selected and separated equal and randomly in three groups: WaveOne Gold group (WG), R-Motion group (RM), and Reciproc Blue group (RB). Cavity access, scouting and shaping of root canals were performed with two instruments, separately, in each of the specimen, using instruments of similar tip and different taper sizes of each system: WaveOne Gold Primary (#25/.07) and WaveOne Gold Medium (#35/.06) (WaveOne Gold ­ Dentsply Sirona); R-Motion 25 (#25/.06) and R- Motion 40 (#40/.04) (R-Motion - FKG Dentaire); and R25 (#25/.08) and R40 (#40/.06) (Reciproc Blue ­ VDW). Each specimen would be scanned by computed microtomography by to three times, preoperatively and after every step of the preparation phases with the selected instruments, to identify untouched surfaces, degree of transportation of the original conduit and measurement of changes in total and apical volumes of the root canal. The results indicate that there was no statistically significant difference in any of the parameters evaluated between the groups. However, only the R-Motion group showed a significant decrease in the percentage of areas not touched after the second instrumentation The results demonstrate that, even with the use of instruments with a similar caliber and smaller conicity, satisfactory results were obtained, covering the measurements of volume and total area of the root canal, degree of transport and centralization capacity.(AU)


Assuntos
Preparo de Canal Radicular , Endodontia , Microtomografia por Raio-X
4.
Pesqui. bras. odontopediatria clín. integr ; 23: e210162, 2023. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1431047

RESUMO

ABSTRACT Objective: To compare the agreement of images in white light (WL), fluorescence (FL), and digital radiographs (DR), on the diagnosis and treatment decisions for occlusal caries lesions against a micro-CT gold standard. Material and Methods: Ten extracted third molars, with enamel and/or dentin caries (ICDAS 2-4), were included. Occlusal surface images were acquired with an intraoral camera (SoproLife®) in WL and FL modes. DR was obtained using an intraoral X-ray and a semi-direct digital system. A total of 780 images were needed, organized in a template, to be later examined by twenty-six dentists invited to compose the study. The Generalized Estimation Equations model was used to compare the proportions of the correct answers between the three methods and the gold standard. When significant, Bonferroni post-hoc test was used to identify differences (α=5%). Results: Most of the examiners were specialists (76.9%) with 14.5 years of experience. All diagnostic methods were similar and showed low agreement (DR 12.7%, WL 16.5%, and FL 16.5%) compared with gold standard caries diagnostic scores. Regarding treatment decisions, mean agreement for all diagnostic methods was higher (43.2%; p<0.001), and among all methods, WL (48.1%) and FL (51.2%) modes performed better than DR (30.4%, p<0.001). Conclusion: SoproLife® images could help clinicians to propose rational, minimally invasive treatments for occlusal caries lesions.


Assuntos
Humanos , Cárie Dentária/diagnóstico por imagem , Microtomografia por Raio-X/métodos , Fluorescência , Tomada de Decisão Clínica , Dente Serotino/lesões , Efetividade , Técnicas In Vitro/métodos , Estudos Transversais/métodos , Radiografia Dentária Digital/métodos
5.
Braz. j. oral sci ; 22: e231303, Jan.-Dec. 2023. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1442844

RESUMO

Aim: To evaluate the potential of inducing mineral density changes of indirect pulp capping materials applied to demineralized dentin. Methods: A total of 50 cavities were prepared, 5 in each tooth, in extracted ten molars without caries, impacted or semi-embedded. The cavities were scanned by microcomputed tomography (µ-CT) after creating artificial caries by microcosm method (pre-treatment). Each cavity was subjected to one of 5 different experimental conditions: control (dental wax), conventional glass ionomer cement (Fuji IX GP Extra), resin-modified calcium silicate (TheraCal LC), resin-modified calcium hydroxide (Ultra-Blend Plus), MTA (MM-MTA) and the samples were kept under intrapulpal pressure using simulated body fluid for 45 days. Then, the second µ-CT scan was performed (post-treatment), and the change in dentin mineral density was calculated. Afterward, elemental mapping was performed on the dentinal surfaces adjacent to the pulp capping agents of 5 randomly selected samples using energy dispersive X-ray spectroscopy (EDS) apparatus attached to a scanning electron microscope (SEM). The Ca/P ratio by weight was calculated. Friedman test and Wilcoxon Signed Ranks test were used to analyze the data. Results: There was a significant increase in mineral density values of demineralized dentin after treatment for all material groups (p<0.05). Resin-modified calcium silicate had similar efficacy to MTA and conventional glass ionomer cement, but was superior to resin-modified calcium hydroxide in increasing the mineral density values of demineralized dentin. Conclusions: Demineralized dentin tissue that is still repairable can be effectively preserved using materials with remineralization capability


Assuntos
Espectrometria por Raios X , Hidróxido de Cálcio , Silicatos , Compostos de Cálcio , Microtomografia por Raio-X , Cimentos de Ionômeros de Vidro
6.
Rio de Janeiro; s.n; 2022. 129 p.
Tese em Português | BBO - Odontologia | ID: biblio-1415074

RESUMO

Objetivou-se elaborar um e-book aos cirurgiões-dentistas sobre as opções de sistema de instrumentação endodôntica para dentes decíduos e comparar os resultados biomecânicos de diferentes sistemas e seu tempo de preparo em protótipos de dentes decíduos por meio de uma análise em micro-CT. Para isso, foram realizados dois estudos. No primeiro, realizou-se uma busca bibliográfica em seis bases de dados por estudos laboratoriais e clínicos sobre protocolos de pulpectomia utilizando pelo menos uma técnica de instrumentação. Dados a respeito das características, cinemática, benefícios e orientações à cerca da utilização de acordo com as instruções dos fabricantes foram extraídos para elaboração do conteúdo teórico e diagramação do layout do e-book, confeccionado no programa Canva. Após finalizado, o mesmo foi avaliado por três pós-graduandos da Disciplina de Odontopediatria da FOUFRJ e as sugestões foram incorporadas. Elaborou-se o material intitulado ''Guia ilustrado de instrumentação endodôntica para dentes decíduos'' contendo 43 páginas, abordando 13 sistemas de instrumentação, com sequências ilustradas de protocolos para utilização. Para o segundo estudo foram utilizados 60 protótipos padronizados de segundos molares decíduos inferiores confeccionados em polímero transparente para avaliar os resultados biomecânicos da instrumentação com diferentes sistemas de limas. Foram utilizados os sistemas manual k-file e mecanizados ProTaper Nextâ (PTN), XP- Endoâ Shaper (XPS), XP- Endoâ Finisher (XPF), XP­Clean (XPC) e Sequence Baby file (SBF) (n= 10/cada). A instrumentação foi realizada por um único operador treinado e o tempo de utilização de cada sistema foi cronometrado. Realizouse a irrigação com um total de 16mL de soro fisiológico à 0,9% para cada canal instrumentado, associada a aspiração simultânea. Os protótipos foram escaneados antes e após da instrumentação através do micro-CT. A reconstrução foi padronizada os conjuntos de imagens iniciais e instrumentados foram registrados entre si. Alterações no volume do canal radicular, área não instrumentada, debris acumulados, volume de dentina removido e transporte do canal foram quantificados. Os dados foram tabulados no programa JAMOVI versão 1.6 e analisados através do teste Shapiro-Wilk para verificar a distribuição dos dados. Para distribuição normal foram realizados testes paramétricos e para aqueles que não seguiram a normalidade, testes não paramétricos foram utilizados, todos com um nível de significância de 5% (p<0,05). A instrumentação com sistemas mecanizados resultou em menos tempo de instrumentação (p< 0,001) do que com a k-file. A porcentagem de áreas não instrumentadas foi semelhante para todos os sistemas. O acúmulo de debris foi maior para K-file e XPS ao longo de todo o canal (p<0,05). Todos os grupos apresentaram aumento do volume do canal radicular após a instrumentação (p= 0,003) com valores mais elevados na lima K-file (p<0,05). A análise 3D revelou maior transporte da lima K-file. SBF e K-file apresentaram, respectivamente, o menor (0,01 ± 0,01 e 0,03 ± 0,04) e o maior (0,04 ± 0,05 e 0,32 ± 0,94) valor de transporte do canal nos protótipos. Diante das metodologias utilizadas, conclui-se que um material relevante e prático ficará disponível nas plataformas digitais da Disciplina de Odontopediatria da UFRJ, para livre acesso e ampla divulgação aos cirurgiões-dentistas. Além disso, com relação aos resultados de instrumentação mecânica, o SBF e o XPC resultaram em uma abordagem mais conservadora. A instrumentação mecânica pode levar à algum grau de transporte do canal e deixar partes das paredes do canal infectadas sem preparo mecânico. (AU)


The objective was to elaborate an e-book to dentists about the options of endodontic instrumentation system for primary teeth and to compare the biomechanical outcomes of the different systems and their instrumentation time in prototypes of primary teeth through micro-CT analysis. To this end, two studies were carried out. In developing the first, a bibliographic search was carried out in six databases. Laboratory and clinical studies with a pulpectomy protocol using at least one instrumentation technique were included. Data about features, kinematics, benefits, and guidelines on use according to the manufacturer's instructions were extracted to prepare the theoretical content and layout diagramming of the e-book using Canva software. Afterwards, it was evaluated by 3 postgraduate students of the Pediatric Dentistry Discipline-FOUFRJ and the suggestions for changes were incorporated. The product entitled 'Guia ilustrado de instrumentação endodôntica para dentes decíduos' contains 43 pages covering 13 instrumentation systems and illustrated sequence of protocols use for each. The second consists of 60 standardized prototype teeth of mandibular second primary molars made with transparent polymer to evaluate the outcomes of biomechanical instrumentation of different systems. Manual k-file, ProTaper Nextâ (PTN), XP-Endoâ Shaper (XPS), XP-Endoâ Finisher (XPF), XP ­ Clean (XPC) and Sequence Baby file (SBF) (n= 10/each) were used. The specimen instrumentation was performed by a single trained and the time spend was recorded. Irrigation was performed with a total of 16mL of 0.9% saline solution for each instrumented canal and simultaneous aspiration. The prototypes were scanned before and after the instrumentation using micro-CT. In addition, the reconstruction was standardized and initial and instrumented image sets were registered with each other. Next, changes in root canal volume, noninstrumented areas, accumulated debris, removed dentin volume and canal transportation were quantified. Data were tabulated in the JAMOVI program version 1.6 and analyzed using the Shapiro-Wilk test to verify the data distribution. For normal distribution, parametric tests were performed and that did not follow normality, nonnormal tests were used, all with a significance level of 5% (p<0.05). Instrumentation with rotary files resulted in less time-consuming (p <0.001) than manual k-file. The percentage of non-instrument areas were similar for all systems. Accumulated debris was higher for K-file and XPS along the entire canal. All groups showed an increase in root canal volume after instrumentation (p= 0.003) with higher values in K-file (p <0.05). 3D analysis revealed greater transportation in K-file. SBF and K-file showed, respectively, the lowest (0.01± 0.01 and 0.03 ± 0.04) and highest (0.04 ± 0.05 and 0.32 ± 0.94) canal transportation value in the prototypes. Given the methodology applied, it was concluded that: the didactic material will be available on the digital platforms of Pediatric Dentistry at UFRJ for free access and widespread. From the overall mechanical instrumentation outcomes, the SBF and XPC resulted in a more conservative approach. Mechanical instrumentation may lead transportation and leave preparation. (AU)


Assuntos
Pulpectomia/instrumentação , Dente Decíduo , Fenômenos Biomecânicos , Odontólogos , Endodontia/instrumentação , Fatores de Tempo , Técnicas In Vitro , Guias de Prática Clínica como Assunto , Microtomografia por Raio-X , Dente Molar
7.
Pesqui. bras. odontopediatria clín. integr ; 22: e210112, 2022. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1386810

RESUMO

Abstract Objective: To evaluate the efficacy of silver diamine fluoride (SDF) in arresting dentin caries lesions when applied under different concentrations and times. Material and Methods: Forty-two bovine blocks were selected and fixed in 24-well plates. Each well received a mixed bacterial inoculum added to the culture medium with 5% sucrose. The plates were incubated in microaerophilia (7 days) for caries formation, confirmed by micro-CT (M1). SDF was applied over the carious lesions for different times and concentrations (n=6): SDF 30% - immediate removal, 1 minute and 3 minutes; SDF 38%, - immediate removal, 1 minute and 3 minutes. The group without treatment was the control. Then, the samples were again scanned by micro-CT (M2) and submitted to a second cariogenic challenge for 21 days. Then, a final scan was performed (M3). Results: Mean pH at the culture medium and lesion depth were compared using Kruskal-Wallis and Wilcoxon tests. 38% SDF showed the lowest metabolic activity of the biofilm. All 38% groups and 30% 1 and 3 minutes did not show an increase in mean lesion depth comparing M3 with M1. However, only 30% 3 minutes and 38% 1 and 3 minutes showed a significant reduction of lesion depth. Conclusion: The minimum application time of 30% SDF to arrest dentin caries lesion was 1 minute, while 38% SDF arrested with application and immediate removal.


Assuntos
Animais , Bovinos , Remineralização Dentária , Cariostáticos/uso terapêutico , Cárie Dentária/epidemiologia , Dentina , Diaminas/química , Fluoretos/química , Prata/uso terapêutico , Técnicas In Vitro/métodos , Estudos Longitudinais , Estatísticas não Paramétricas , Biofilmes , Microtomografia por Raio-X/instrumentação
8.
Rev. odontol. UNESP (Online) ; 51: e20220045, 2022. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1424231

RESUMO

Introdução: o desafio no uso do Micro-Ct tem sido estabelecer e padronizar padrões adequados para escaneamento e tratamento das imagens, para que se obtenha o máximo desempenho do equipamento, e permitir a comparação dos achados entre diferentes estudos. Objetivo: o presente estudo tem como objetivo comparar a porcentagem de volume ósseo em regiões com perda óssea periodontal utilizando diferentes metodologias para definição da área a ser analisada (ROI). Material e método: dez ratos foram submetidos à indução de doença periodontal, e, após a eutanásia, as mandíbulas foram escaneadas com cortes de 9 µ e 18 µm de espessura, com passo de rotação de 0.3mm. As imagens foram reconstituídas utilizando o software NRecon, e em seguida, utilizando o software CTAnalyser - CTAn, foram definidas as áreas de interesse (ROI) ao redor dos segundos molares. A primeira área de interesse (ROI1) foi definida em um padrão retangular que se restringiu às regiões interproximais e furca, onde a área total de tecido ósseo foi obtida somando os resultados dos 3 ROIs. A segunda área (ROI2) foi definida no sentido corono/apical ao redor do segundo molar até suas limitações proximais com os dentes vizinhos, onde a porcentagem de tecido ósseo pertencente às raízes foram excluídas das avaliações. As análises foram realizadas com cinco diferentes valores de thresholds (130-50, 130-60, 130-70, 130-80, 130-90 e 130-100). Resultado: a análise entre os diferentes ROIs demonstrou que em ambas as análises foi observada a tendência a menor porcentagem de tecido ósseo quanto maior o contraste de tons de cinza utilizado, no entanto, nos resultados obtidos no ROI2 essa diferença não foi estatisticamente significante. Conclusão: com os resultados obtidos pode se concluir que a utilização de diferentes thresholds para quantificação óssea, em áreas onde houve doença periodontal, pode trazer resultados divergentes; a definição da área de interesse interfere com os resultados obtidos e que a obtenção de uma área de interesse com a remoção das raízes mostrou-se menos susceptível à variação dos parâmetros de escaneamento.


Introduction: the challenge in the use of Micro-Ct has been to establish and standardize adequate standards for scanning and image processing to obtain the maximum performance of the equipment and to allow the comparison of findings between different studies. Objective: this study aims to compare the percentage of bone volume in regions with periodontal bone loss using different methodologies to define the area to be analysed (ROI). Material and method: ten rats were submitted to periodontal disease induction, and, after euthanasia, the mandibles were scanned with slices of 9µ and 18 µm thickness, with a rotation step of 0.3mm. The images were reconstructed using the NRecon software, and then, using the CTAnalyser - CTAn software, the areas of interest (ROI) around the second molars were defined. The first area of interest (ROI1) was defined in a rectangular pattern that was restricted to the interproximal and furcation regions, where the total area of bone tissue was obtained by adding the results of the 3 ROIs. The second area (ROI2) was defined in the coronal/apical direction around the second molar to its proximal limitations with the neighboring teeth, in which the percentage of bone tissue belonging to the roots was excluded from the evaluations. Analyses were performed with five different threshold values (130-50, 130-60, 130-70, 130-80, 130-90, and 130-100). Result: the analysis between the different ROIs showed that, in both analyses, there was a tendency towards a lower percentage of bone tissue the greater the grayscale contrast used. However, in the results obtained in ROI2, this difference was not statistically significant. Conclusion: with the results obtained, it can be concluded that the use of different thresholds for bone quantification, in areas where there was a periodontal disease, can bring divergent results; the definition of the area of ​​interest interferes with the results obtained; and that obtaining an area of interest with the removal of the roots, proved to be less susceptible to the variation of the scanning parameters.


Assuntos
Animais , Ratos , Doenças Periodontais , Periodontite , Perda do Osso Alveolar , Microtomografia por Raio-X , Mandíbula , Dente Molar , Análise de Variância
9.
Rev. odontol. UNESP (Online) ; 51: e20220047, 2022. tab, ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1424238

RESUMO

Introduction: Primary stability is one of the goals of modern implant dentistry and if achieved, reduces treatment time for prosthetic rehabilitation and the number of interventions made in patients mouth. Several companies state as protocol for connical conection implants, a subcrestally positioning. Objective: This in vitro study aimed to evaluate the effect of placing a conical connection implant equicrestally and subcrestally on static and loading condition in two types of bone density. Material and method: A total of 200 bone cylinders were extracted from femur of pigs, standardized by means of x-rays and computerized microtomography scan (microCT) and separated in low and high density specimens. The implants were placed on the center of the bone cylinders and were evaluated before and after loading by means of microCT and histomorphometry. Result: The results showed that placing the evaluated implant subcrestally provided better primary stability and performance on static and loading situations on low and high density bone. Conclusion: Placing implant subcrestally improve primary stability outcomes under loading and static situations.


Introdução: A estabilidade primária é um dos objetivos da implantodontia moderna e, caso atingida, reduz o tempo de tratamento para a reabilitação protéticas e o número de intervenções realizadas. Diversas empresas preconizam a posição subcrestal no uso de implantes com conexão cônica interna. Objetivo: Este estudo in vitro avaliou o efeito do posicionamento de implantes de conexão conica interna sub e equicrestal sob condições estáticas e em função, considerando dois tipos de densidades ósseas. Material e método: um total de 200 espécimes de osso extraído do femur de suínos e padronizados por meio de radiografias e microtomografias computadorizadas foram separados em densidade alta e baixa. Implantes foram instalados no centro dos especimes e for a avaliados por meio de microCT e histomorfometria. Resultado: Os resultados demonstraram que a colocação de implante subcrestalmente promoveu melhor estabilidade primária e performance em todas as situações, irrespectivamente à densidade óssea. Conclusão: A colocação de implantes subcrestalmente melhora a estabilidade primária em todas as situações, sendo indicada quando da utilização de conexões cônicas internas.


Assuntos
Técnicas In Vitro , Densidade Óssea , Implantes Dentários , Microtomografia por Raio-X , Carga Imediata em Implante Dentário
10.
Braz. j. oral sci ; 20: e210432, jan.-dez. 2021. ilus
Artigo em Inglês | BBO - Odontologia, LILACS | ID: biblio-1254269

RESUMO

Aim: The aim of this study was to evaluate, by micro-computed tomography (micro-CT) analysis, the remaining filling material during endodontic retreatment performed with Protaper retreatment without solvent. Methods: Forty mandibular molars were divided into two groups (n = 20) according to the sealer used in the obturation: the bioceramic TotalFill BC (TF) or the resin-based AH Plus (AHP). The specimens were scanned before instrumentation, after obturation and after filling removal. Only the mesial roots were analysed. The filling volumes and the remaining filling material were calculated in the entire root canal and in the cervical, middle and apical thirds. Results: The volume of obturation and the volume of remaining filling material in the entire root canal and in the cervical, middle and apical thirds of the canal between the groups were not statistically different (independent t-test, p > 0.05). In the AHP group, there was a higher percentage of remaining filling material in the middle third than in the cervical third (p < 0.05). Conclusion: The filling material could not be entirely removed from any specimen


Assuntos
Materiais Restauradores do Canal Radicular , Retratamento , Microtomografia por Raio-X , Dente Molar
11.
Braz. dent. j ; 32(4): 1-7, July-Aug. 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1345516

RESUMO

Abstract This study evaluated the 3D quality of root-end filling, assessing the presence (volume and percentage) of marginal gaps and internal voids formed after retro-filling with three calcium silicate-based materials: MTA Angelus (Angelus Soluçoes Odontologicas, Londrina, PR, Brazil), Biodentine (Septodont Ltd., Saint Maur-des-Faussés, France) and Neo MTA Plus (Avalon Biomed Inc., Bradenton, Florida, US). Thirty human, extracted, single rooted teeth were used. Orthograde root canal treatment, root resection (3mm shorter than the apex) and retrograde cavity preparation with ultrasonic tips were performed. Teeth were divided into 3 groups (n =10 each) following a stratified randomization according to the initial volume of the root-end cavity. After retrofilling, samples were stored for 7 days. Then, two rounds of micro-CT scans were performed: soon after root-end preparation (with the cavity still empty) and 7 days after root-end filling. Marginal gaps, internal voids volume (mm3 and %), as well as, the overall defects (sum of gaps and voids) were evaluated. Statistics compared the three groups in relation to those defects. There was not statistical difference between groups regarding the marginal gaps (P≥ 0.05), the internal voids (P≥ 0.05), and the overall defects (P≥ 0.05). Median (mm3) and % of overall air-entrapment defects (gaps and/or voids) was: 0.004mm3 and 1.749% for MTA Angelus, 0.018mm3 and 6.660% for Biodentine, and 0.012mm3 and 4.079% for Neo MTA Plus. All materials had gaps and/or voids. No differences were found between MTA Angelus, Biodentine and Neo MTA Plus.


Resumo Este estudo avaliou a qualidade 3D de retro-obturações, avaliando a presença (volume e percentagem) de "gaps" marginais e "voids" internos formados a partir da retro-obturação com três materiais à base de silicato de cálcio: MTA Angelus (Angelus Soluções Odontológicas, Londrina, PR, Brasil), Biodentine (Septodont Ltd., Saint Maur-des-Faussés, França) and Neo MTA Plus (Avalon Biomed Inc., Bradenton, Flórida, US). Trinta dentes humanos unirradiculares extraídos foram usados. Após tratamento de canal ortrógrado, resecção radicular (3 mm apicais), o prepare da cavidade retrógrada com pontas ultrassônicas foi realizado. Os dentes foram divididos em três grupos (n= 10 cada) seguindo uma randomização estratificada, de acordo com o volume inicial da cavidade retrógrada. Depois da retro-obturação as amostras foram armazenadas por 7 dias. Duas rodadas de escaneamento de micro-CT foram realizadas: logo após o preparo retrógrado (com a cavidade ainda vazia) e 7 dias após a retro-obturação. O volume de "gaps" marginais e de "voids" internos (mm3 e %), bem como, os defeitos totais (soma de "gaps" e "voids") foram avaliados. Não houve diferença estatística entre os grupos em relação aos "gaps" marginais (P≥ 0,05), "voids" internos (P≥ 0,05), e aos defeitos totais (P≥ 0,05). A mediana (mm3) e porcentagem dos defeitos totais de aprisionamento de ar foi 0,004mm3 e 1,749% para o MTA Angelus, 0,018mm3 e 6,660% para o Biodentine, e 0,012mm3 e 4,079% para o Neo MTA Plus. Todos os materiais tiveram defeitos ("gaps"e/ou "voids"). Não houve diferença entre MTA Angelus, Biodentine e Neo MTA Plus.


Assuntos
Humanos , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular , Tratamento do Canal Radicular , Silicatos , Compostos de Cálcio , Microtomografia por Raio-X
12.
Braz. dent. j ; 32(1): 42-47, Jan.-Feb. 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1180727

RESUMO

Abstract New methodologies using micro-CT to evaluate solubility besides dimensional and morphological changes of endodontic materials are proposed. However, there is no standardization in the methods. The aim of this study was to assess the effect of different dimensions of test samples on volumetric change evaluation of different endodontic materials. AH Plus, FillCanal and Sealapex root canal sealers, Biodentine, IRM and MTA root-end filling cements were used in the tests. Samples of each material with a thickness of 1.5 mm and different diameters were manufactured: 6.3, 7.75, and 9.0 mm. The samples were scanned in micro-computed tomography (micro-CT) after setting and after 7 days of immersion in distilled water. The volumetric change was evaluated by means of the difference in the total volume of the specimens before and after immersion. Data were submitted to ANOVA and Tukey tests (p<0.05). The size of the samples did not affect the percentage of volumetric change of the materials (p>0.05). All sample sizes had greater volume loss for Sealapex among the sealers and Biodentine for the cements (p<0.05). In conclusion, Biodentine and Sealapex had the highest volume loss after immersion. Samples with 1.5 mm thickness, and diameters ranging between 6.3 and 9.0 mm can be used to assess the stability of endodontic materials using micro-CT without affecting the percentage of volumetric change.


Resumo Novas metodologias utilizando micro-CT são propostas para avaliar a solubilidade além de alterações dimensionais e morfológicas em materiais endodônticos. No entanto, não há padronização nos métodos. O objetivo deste estudo foi avaliar o efeito de diferentes dimensões de corpos de prova na avaliação da alteração volumétrica de diferentes materiais endodônticos. Os cimentos obturadores AH Plus, FillCanal e Sealapex e os cimentos retrobturadores Biodentine, IRM e MTA foram utilizados nos testes. Foram confeccionadas amostras de cada material com espessura de 1.5 mm e diâmetros diferentes: 6.3, 7.75 e 9.0 mm. As amostras foram escaneadas em microtomografia computadorizada (micro-CT) após a presa e após 7 dias de imersão em água destilada. A alteração volumétrica foi avaliada por meio da diferença no volume total dos corpos de prova antes e após a imersão. Os dados foram submetidos aos testes ANOVA e Tukey (p<0,05). A dimensão das amostras não afetou o percentual de alteração volumétrica dos materiais (p>0,05). Todos os diâmetros de amostra mostraram maior perda de volume para Sealapex entre os cimentos obturadores e Biodentine entre os cimentos retrobturadores (p<0,05). Como conclusão, Biodentine e Sealapex mostraram a maior perda volumétrica após a imersão. Amostras com 1.5 mm de espessura e diâmetros variando entre 6.3 e 9.0 mm podem ser usadas para avaliação da estabilidade de materiais endodônticos utilizando micro-CT, sem influenciar no percentual de alteração volumétrica.


Assuntos
Materiais Restauradores do Canal Radicular , Óxidos , Obturação do Canal Radicular , Teste de Materiais , Compostos de Cálcio , Combinação de Medicamentos , Resinas Epóxi , Microtomografia por Raio-X
13.
Braz. oral res. (Online) ; 35: e028, 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1153621

RESUMO

Abstract The aim of this study was to evaluate the filling ability of a new ready-to-use calcium silicate-based sealer using thermoplastic or single-cone technique in flattened root canals. Twenty-four flattened distal canals of mandibular molars with a buccolingual diameter 4 or more times larger than the mesiodistal diameter were selected. The root canals were prepared and filled (n = 12), according to the following techniques: thermoplastic or single-cone technique using Bio-C Sealer. The teeth were scanned using Skycan 1176 micro-computed tomography (micro-CT) - voxel size 8.74 µm, before and after filling the root canal. The percentage of voids in the filled root canals was evaluated, and the data were statistically analyzed using the unpaired t-test (α = 0.05). The root canals filled using the thermoplastic technique created a smaller percentage of voids in the cervical/middle thirds than those filled using the single-cone technique (p < 0.05). There was no difference in the percentage of voids using either technique in the apical third (p > 0.05). The flattened root canals in the cervical/middle thirds were better filled using the ready-to-use calcium silicate-based sealer associated to the thermoplastic technique, compared with the single-cone technique. In the apical third, the techniques showed similar filling ability.


Assuntos
Materiais Restauradores do Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Obturação do Canal Radicular , Preparo de Canal Radicular , Microtomografia por Raio-X , Guta-Percha , Dente Molar
14.
Braz. dent. sci ; 24(1): 1-8, 2021. tab, ilus
Artigo em Inglês | BBO - Odontologia, LILACS | ID: biblio-1145442

RESUMO

Objetivo: Estudos demostraram que a zircônia monolítica um dos materiais restauradores desenvolvidos recentemente, resolveu vários problemas de restauração de zircônia. Portanto, a precisão marginal e o ajuste interno são necessários para o sucesso clinico e para a qualidade da restauração, e o espaço do cimento pode influenciar o ajuste marginal. Assim, o presente estudo teve como objetivo investigar os efeitos da espessura do cimento e o tipo de restauração na discrepância marginal. Material e métodos: foram usadas para fabricação de coroa total. Dois tipos de materiais incluindo Zirconia monolítica (Zolid) e Sintron foram usadas para produzir a coroa total. As amostras de cada grupo foram digitalizadas em laboratório dentário por um scanner 3D, projetadas e acessadas usando CAD-CAM. As amostras foram divididas em quatro grupos de cinco com espaço de 30 e 50 mícrons de cimento. Para avaliar a discrepância marginal, as coroas foram colocadas em seus respectivos dentes sem o uso de qualquer intermediário e examinados em micro-CT. Os dados foram avaliados pelo software SPSS. Resultados: Descobriu-se que a discrepância marginal do Sintron é maior que a discrepância da zircônia monolítica. Na verdade, a zircônia monolítica com espaço de 50 µm de cimento exibiu uma menor discrepância marginal, e o espaço de cimento do Sintron não influenciou significantemente na discrepância marginal. Conclusão: Concluiu-se que os tipos de material e o espaço do cimento influencia na discrepância marginal da restauração construída pelo fluxo digital (AU)


Objective: Studies demonstrated that as one of then ewly developed restorative materials, monolithic zirconia resolved several issues of zirconia restoration. Therefore, marginal accuracy and internal fit are necessary for clinical success and quality of restorations, and cement space may influence the marginal fit. Thus, the present research aimed to investigate the effects of the cement thickness and kind of restoration on the marginal discrepancy. Material and methods: In this study, 20 maxillary left first molars, prepared by DRSK Co., were used to fabricate a full crown. Two types of material included monolithic zirconia (Zolid) and Sintron were used to make a full crown. Samples from each group were scanned by dental laboratory 3D scanner and designed and processed using CAD-CAM. The samples were divided into four groups of five with 30-and 50- µm cement spaces. In order to assess the vertical marginal discrepancy, the crowns were fittedon their respective teeth without using any mediator and examined by a micro-CT scanner. Data were analyzed by SPSS software. Results: It has been found that marginal discrepancy in Sintron is higher than the discrepancy of monolithic zirconia. In fact, monolithic zirconia with 50-micron cement space exhibited the least marginal discrepancy and the cement space in Sintron did not significantly influence the marginal discrepancy. Conclusion: It has been concluded that the material kinds and cement space influence the restoration marginal discrepancy constructed by digital workflow (AU)


Assuntos
Adaptação Marginal Dentária , Cimentos Dentários , Microtomografia por Raio-X
15.
Rio de Janeiro; s.n; 2021. 44 p. tab, ilus.
Tese em Português | BBO - Odontologia | ID: biblio-1400618

RESUMO

A irrigação final auxilia na remoção da smear layer e do material obturador remanescente nos retratamentos endodônticos. Nestes casos, as paredes dos canais estão mais finas e desgastes desnecessários podem ser prejudiciais à sobrevida do dente. Desta forma, o objetivo do estudo foi avaliar por meio de imagens de microtomografia computadorizada (micro-CT) a quantidade de desgaste dentinário ocasionado pela Irrigação Ultrassônica Passiva (PUI) e pelo instrumento Easy Clean (EC) em movimento rotatório contínuo, quando utilizados na remoção final do material obturador durante o retratamento endodôntico. Foram utilizadas 36 raízes mesiais de primeiros molares inferiores humanos, divididos em 4 grupos (n= 9) de acordo com o cimento utilizado na obturação e o sistema de agitação usado na irrigação final do retratamento: Grupo PUI/AH Plus; Grupo EC/AH Plus (Easy Clean/AH Plus); Grupo PUI/TF (PUI/TotalFill BC Sealer); Grupo EC/TF (Easy Clean/TotalFill BC Sealer). As amostras foram escaneadas por micro-CT após a desobstrução do canal e após o uso da PUI ou do instrumento EasyClean. Os volumes dos canais foram avaliados por inteiro e por terços (coronário, médio e apical) e as imagens foram analisadas estatisticamente. O teste de Kolmogorov-Smirnov foi utilizado para avaliar a normalidade dos dados. O teste de Kruskal-wallis foi utilizado para comparar os valores de volume inicial (Vi), volume final (Vf) e Δv entre os grupos e o teste de Wilcoxon pareado foi usado pra comparar os valores de vi, vf em cada grupo. Quando o canal inteiro foi considerado, não houve diferença estatisticamente significativa entre os Vi, Vf e ΔV dos canais nos diferentes grupos (Wilcoxon pareado, p>0,05) e entre os grupos (Kruskal-Wallis, p>0,05). Porém, quando os canais foram divididos em terços, houve diferença entre os valores de Vi e Vf em todos os grupos (p<0,05), exceto no terço coronário do grupo PUI/TF (p>0,05). Os terços coronário e médio apresentaram maiores desgastes que o terço apical, e os maiores desgastes encontrados neste terço foram nos grupos onde foram utilizados o instrumento Easy Clean, com ambos os cimentos. Apesar dos diferentes cimentos utilizados, não foram encontradas diferenças quanto ao nível de desgaste nos diferentes grupos. Os instrumentos se mostraram seguros quanto ao desgaste dentinário, quando avaliado o canal por inteiro. Na avaliação por terços, o instrumento Easy Clean obteve o maior desgaste no terço apical, não havendo diferença entre os cimentos. (AU)


The final irrigation helps to remove the smear layer and the remaining filling material in the endodontic retreatments. In these cases, the canal walls are thinner and unnecessary wear can be detrimental to the tooth's lifespan. Thus, the objective of the study was to evaluate by means of computerized microtomography (micro-CT) images the amount of tooth wear caused by Passive Ultrasonic Irrigation (PUI) and the Easy Clean (EC) instrument in continuous rotational movement, when used in the final removal of obturator material during endodontic retreatment. Were used 36 mesial roots of human lower first molars, divided into 4 groups (n = 9) according to the cement used in the filling and the agitation system used in the final irrigation of the retreatment: Group PUI/AH Plus; Group EC/AH Plus (Easy Clean/AH Plus); Group PUI/TF (PUI/TotalFill BC Sealer); Group EC/TF (Easy Clean/TotalFill BC Sealer). Samples were scanned by micro-CT after canal cleaning and after using the PUI or Easy Clean instrument. The volumes of the canals were evaluated in the whole and in thirds (coronary, middle and apical) and the images were analyzed statistically. The Kolmogorov-Smirnov test was used to assess data normality. The Kruskal-Wallis test was used to compare the initial volume (Vi), final volume (Vf) and Δv values between groups and the paired Wilcoxon test was used to compare the values of vi, vf in each group. When the entire canal was considered, there was no statistically significant difference between the Vi, Vf and ΔV of the canals in the different groups (Wilcoxon paired, p>0.05) and between groups (Kruskal-Wallis, p>0.05). However, when the canals were divided into thirds, there was a difference between the values of Vi and Vf in all groups (p<0.05), except for the coronary third of the PUI/TF group (p>0.05). The coronary and middle thirds showed greater wear than the apical third, and the highest wear found in this third were in the groups where the Easy Clean instrument was used, with both cements. Despite the different cements used, no differences were found regarding the level of wear in the different groups. The instruments proved to be safe regarding dentinal wear, when the entire canal was evaluated. In the evaluation by thirds, the Easy Clean instrument had the highest wear in the apical third, with no difference between the cements. (AU)


Assuntos
Humanos , Irrigantes do Canal Radicular , Tratamento do Canal Radicular/instrumentação , Retratamento , Microtomografia por Raio-X , Desgaste dos Dentes , Tratamento do Canal Radicular/métodos , Camada de Esfregaço , Dente Molar
16.
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1351219

RESUMO

ABSTRACT Objective: To determine in vitro the frequency, shape, type, diameter, and patency of accessory canals in the primary molars pulp chamber floor. Material and Methods: Sixteen healthy primary molars were evaluated by micro-computed tomography and scanning electron microscopy. Descriptive analyses of the frequency, shape (round, oval, or irregular), type (blind, true, or hidden), patency and diameter of the accessory canals were performed. Results: Half of the teeth presented accessory canals, 62.5% of which were located in the upper molars and 37.5% in the lower molars. The most frequent shape was irregular. In three-dimensional analysis, blind accessory canals (12.5%) and with patency (18.7%) of the teeth were observed. The average accessory canal diameter was 51.97 µm (± 26.03 µm). Conclusion: Upper molars showed a higher frequency of accessory canals with larger diameters. The irregular shape was the most frequent. 18.7% of accessory channels showed patency.


Assuntos
Humanos , Masculino , Feminino , Criança , Técnicas In Vitro/métodos , Microscopia Eletrônica de Varredura/instrumentação , Preparo de Canal Radicular/instrumentação , Microtomografia por Raio-X/instrumentação , Dente Molar , Brasil/epidemiologia , Estatísticas não Paramétricas , Cavidade Pulpar/anatomia & histologia
17.
Braz. oral res. (Online) ; 35: e060, 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1249378

RESUMO

Abstract: This study aimed to describe the morphometric relationship of root canal orifices on the pulp floor in the presence/absence of mesiobuccal second canal (MB2) in the maxillary first molars and other aspects of its internal anatomy. Sixty-two maxillary first molars were scanned by micro-CT. The presence of the MB2 canal was verified. The distance between the center points of the MB1, MB2, distobuccal (DB), and palatal (P) canal orifices on the pulp floor were measured (MB1-MB2, MB1-DB, MB2-DB, MB1-P, and DB-P). The MB1-P to DB-P ratio was calculated. The distances between the anatomic apex and the MB1 and MB2 apical foramina were measured. The length of the band-shaped isthmus was also measured. Student's t-test was applied to verify the association between the presence of an MB2 canal, the interorifice distances, and the ratio of the MB1-P to DB-P distance (α = 5%). The MB2 canal was present in 43 roots (69.35%). Statistics showed significant differences when MB2 was present for the largest MB1-P distance (p < 0.05) and higher values for the MB1-P to DB-P ratio (p < 0.05). A band-shaped isthmus was detected in 25.8% of MB roots. The mean distance from the apical foramen to the isthmus floor ranged from 1.74 for MB1 canals to 1.42 for MB2 canals. Canal orifice distances on the pulp floor may predict the presence of MB2 canals. There was a high incidence of isthmus, accessory canals, and apical delta in the critical apical zone in MB roots of maxillary first molars.


Assuntos
Raiz Dentária/diagnóstico por imagem , Maxila/diagnóstico por imagem , Cavidade Pulpar/diagnóstico por imagem , Microtomografia por Raio-X , Dente Molar/diagnóstico por imagem
18.
Braz. oral res. (Online) ; 35: e064, 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1249380

RESUMO

Abstract: Sixty moderately curved canals of mandibular molars classified as Vertucci's type IV canal configuration were selected by micro-CT 1174. The teeth were divided into two groups according to the kinematics used, whether reciprocating or rotary motion (n=30, totaling 60 mesial root canals). The instruments used to perform the glide path procedures had identical features (0.15 mm of tip size, 0.04 mm/mm taper, thermal treatment, and square cross-section), but differed in the direction of the cutting blade. The duration of the procedure and the absolute and percentage frequency of the instruments to reach the full working length were recorded. The torsional test (3630-1; 1992) was performed on both used and unused instruments, to evaluate a possible reduction in the torsional resistance when using the glide path procedure. Statistical analysis was performed using the unpaired t-test and the chi-square test, and the level of significance was set at 5%. The type of kinematics used affected the duration of glide path procedures, and the reciprocating motion seemed to induce less torsional stress during glide path procedures.


Assuntos
Preparo de Canal Radicular , Cavidade Pulpar , Fenômenos Biomecânicos , Desenho de Equipamento , Microtomografia por Raio-X , Dente Molar/diagnóstico por imagem
19.
Braz. oral res. (Online) ; 35: e008, 2021. tab, graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1132748

RESUMO

Abstract: The aim of this study was to assess the influence of micro-computed tomography (micro-CT) voxel size on the evaluation of debris accumulation after passive ultrasonic irrigation (PUI) in curved root canals prepared with rotary nickel-titanium files. Mesial root canals (n = 24) of mandibular molars with curvature between 25° and 35° were prepared using ProDesign Logic 30/.05 (PDL) or HyFlex EDM 25/.08 (HEDM). PUI was performed after root canal preparation of all root canals. The specimens were scanned using high-resolution (5 μm voxel size) micro-CT imaging before and after experimental procedures. The percentage of debris was analyzed in the middle and apical thirds using images with 5, 10 and 20 μm voxel sizes. Data were compared using unpaired and paired Student's t-test, ANOVA and Tukey's statistical tests (α = 0.05). There were no differences among the debris analyses performed at different voxel sizes (5, 10 and 20 μm) (p > 0.05). The percentage of debris was similar between the root canals prepared by PDL and HEDM before and after PUI (p > 0.05). In both groups, the percentage of debris decreased in the middle third after PUI (p < 0.05). Within the limitations of this ex vivo study, it can be concluded that the voxel sizes evaluated did not have a significant impact on the analysis of accumulated debris. However, the results showed a tendency for detection of more debris in the analysis performed using a lower voxel size. PUI decreased the debris accumulation in the middle third of curved root canals.


Assuntos
Humanos , Preparo de Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Microtomografia por Raio-X , Dente Molar/diagnóstico por imagem
20.
Braz. oral res. (Online) ; 35: e080, 2021. graf
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1278598

RESUMO

Abstract: This research evaluated, in vivo, the accuracy of three electronic apex locators - EALs (Root ZXII, E-PEX and FIND) in teeth with vital pulp submitted to biopulpectomy, preserving the periodontal stump. For this study, 90 single-rooted teeth with extraction indication were selected. After positive pulpal cold sensitivity test, pulp chamber access was performed. The cervical and middle thirds of root canals were instrumented with Reciproc R25, and the K#15 file was used as a standard instrument to determine working length, forming 2 groups: Constriction (insertion of the instrument until the apical constriction limit) and Foramen (insertion of the instrument until the foramen and then repositioning at constriction, without removing the file from the canal). The hand file was stabilized with a light-cured flow resin. After extraction, the samples were analyzed through microCT SkyScan 1272, with CTAN software, which evaluated the proximity between the tip of the file to the apical constriction, providing data for comparative analysis using Kruskal-Wallis and Dunn tests (p<0.05). There was a statistically significant difference in the abilities of the EALs to detect the apical constriction after reaching the foramen with Root ZX II showing higher accuracy (89%). However, there was no difference in the accuracy of the three EALs in detecting the apical constriction without reaching the foramen. Based on the present results, we conclude that EALs may show accurate measures in detecting apical constriction and foramen, even without damaging the periodontal stump in biopulpectomy.


Assuntos
Ápice Dentário/diagnóstico por imagem , Cavidade Pulpar , Raiz Dentária , Preparo de Canal Radicular , Microtomografia por Raio-X , Odontometria
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