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1.
Braz. j. oral sci ; 21: e224013, jan.-dez. 2022. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1354702

RESUMO

Aim: The aim of the study was to evaluate the cleaning of mandibular incisors with WaveOne Gold® (WO) under different preparation techniques. Methods: A total of 210 human mandibular incisors were selected and divided into seven groups (n = 30), prepared by WO single-files (Small 20/.07 ­ WOS; Primary 25/.07 ­ WOP; Medium 35/.06 ­ WOM; or Large 45/.05 - WOL) and sequential-file techniques (WOS to WOP; WOS to WOM; and WOS to WOL). Further subdivision was made according to irrigation protocol: control group (manual irrigation - CON), E1 Irrisonic® - EIR, and EDDY® - EDD. Debris removal and the smear layer were evaluated by scanning electron microscopy. Data were analyzed by using Spearman's correlation test. The significance level was set at 5%. Results: For debris and smear layer removal, WOS and WOP, EIR differed from CON and EDD (p <0.05). Conclusion: Regardless of the instrumentation used, the agitation of the irrigant solution provided better cleanability. These findings reinforce the need for agitation techniques as adjuvants in cleaning root canal systems in mandibular incisors


Assuntos
Irrigantes do Canal Radicular , Microscopia Eletrônica de Varredura , Preparo de Canal Radicular , Endodontia
2.
Braz Dent J ; 33(2): 12-21, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35508032

RESUMO

The purpose of this in vitro study was to evaluate the shaping ability of reciprocating and continuous rotary systems after root canal retreatment. After preparation and root canal filling, mesial canals of 54 mandibular molars were distributed into 3 groups (n=18), according to the filling material removal and re-instrumentation protocols: WOG group - WaveOne Gold system; PTN group - ProTaper Next system; and PTU group - ProTaper Universal system. Cone-beam computed tomographic (CBCT) images acquisition of the mesial root canals was performed at different moments: (1) before instrumentation (unprepared root canals), (2) after preparation and filling, (3) after filling material removal and (4) re-instrumentation. The apical transportation (AT), centering ability (CA) and change in root canal diameter were assessed by CBCT analysis. The remaining filling material quantification was performed by radiographic examination. The statistical analyses were performed using the 3-way ANOVA, Tukey-Kramer, Kruskal-Wallis and Dunn multiple Comparison tests (p<0.05). The tested instruments did not show full CA (=1.0). PTN group had greater AT at the 5th mm in comparison with the WOG group (p<0.05). After re-instrumentation, WOG group had greater root canal diameter change at the 1st and 5th mm than PTN and PTU groups (p<0.05). There was no significant difference among groups when comparing the amount of remaining filling material after re-instrumentation (p>0.05). The tested systems provided minimal alteration in root canal morphology at the apical portion after root canal retreatment. However, WOG promoted greater change in root canal diameter.


Assuntos
Materiais Restauradores do Canal Radicular , Tomografia Computadorizada de Feixe Cônico Espiral , Cavidade Pulpar/anatomia & histologia , Desenho de Equipamento , Dente Molar/anatomia & histologia , Dente Molar/diagnóstico por imagem , Retratamento , Obturação do Canal Radicular , Preparo de Canal Radicular/métodos , Microtomografia por Raio-X/métodos
3.
Artigo em Inglês | MEDLINE | ID: mdl-35410096

RESUMO

In this study, we compare and analyze the scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), morphometry and cyclic fatigue resistance of Endogal, PathMax, and Smarttrack novel brands of nickel-titanium (NiTi) alloy endodontic files. Material and Methods: Thirty sterile NiTi endodontic rotary files were randomly selected and assigned to one of the following study groups: A: 25.08 F2 Endogal (EDG) (n = 10); B: 25.08 F2 Path Max Pro (PMP) (n = 10); and C: 25.06 Smarttrack (ST) (n = 10). Dynamic cyclic fatigue tests were conducted using a cyclic fatigue device in stainless steel artificial root canal systems with an apical diameter of 250 µm, curvature angle of 60°, radius of curvature of 3 mm, and taper of 6%. Additionally, we analyzed the NiTi endodontic rotary files using EDX, SEM, and morphometry after micro-CT scanning. The results were analyzed using Weibull statistical analysis and ANOVA testing. Results: SEM, EDX, and morphometric analyses showed differences between the three novel brands of NiTi endodontic rotary files. Moreover, statistically significant differences were observed between the number of cycles to failure and time to failure of the three novel brands of NiTi endodontic rotary files (p < 0.001). Conclusions: Smarttrack NiTi alloy endodontic reciprocating files display greater resistance to cyclic fatigue than Endogal and Path Max Pro NiTi alloy endodontic rotary files, due to the reciprocating movement and metallurgical composition.


Assuntos
Níquel , Titânio , Ligas , Desenho de Equipamento , Falha de Equipamento , Microscopia Eletrônica de Varredura , Níquel/química , Preparo de Canal Radicular , Titânio/química
4.
Braz Oral Res ; 36: e053, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35442382

RESUMO

This study assessed the ability of XP-endo Finisher R (FKG, La Chaux-de-Fonds, Switzerland) to remove filling remnants from curved mesiobuccal canals of maxillary molars, using the passive ultrasonic irrigation (PUI) technique as a comparison. Twenty-four curved main mesiobuccal canals (MB1) of maxillary molars were instrumented with Wave One (#25/07) and filled with gutta-percha points and AH Plus Sealer. Samples were then re-treated with a standardized protocol with Wave One (#35/06) as the master apical file. Micro-CT scans measured baseline volume of remaining filling material (in mm3). Samples were divided into two groups (n = 12) according to the supplementary cleaning approach: (PUI) or XP-endo Finisher R. Statistics compared baseline and final volume of filling material (within-group); and the percentage of filling material reduction (between-group). Mean baseline volumes, final volumes, and percentages of reduction (%) of filling material for XP-endo Finisher R and PUI were respectively: 0.060 mm3, 0.042 mm3, and 31.28%; and 0.064 mm3, 0.054 mm3, and 16.57%. Both tested protocols reduced the amount of filling material (p < 0.05). XP-endo Finisher R had higher percentage of reduction as compared to PUI (p < 0.05). XP-endo Finisher R and PUI used as supplementary cleaning protocols during re-treatment improved the removal of root filling material in curved canals; but XP-endo Finisher R was approximately twice more efficient. The complete filling material removal during re-treatment procedures is still a challenge. Supplementary cleaning protocols may help to remove the remaining material after the complete mechanical preparation of curved canals. XP-endo Finisher R was approximately twice more efficient than PUI.


Assuntos
Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Retratamento , Materiais Restauradores do Canal Radicular/uso terapêutico , Preparo de Canal Radicular , Ultrassom
6.
J Indian Soc Pedod Prev Dent ; 40(1): 9-18, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35439877

RESUMO

Aim: This study aimed to systematically review available literature of in vitro studies on apical extrusion of debris through rotary instrumentation in comparison to manual instrumentation in pediatric endodontics, and also to perform a comparison between various rotary instrumentation systems for assessment of debris extrusion. Materials and Methods: A comprehensive search was conducted on PubMed, Medline, Cochrane Library, Embase, Scopus, and Google Scholar without any language restriction and year of publication. A planned search strategy was made for PubMed and applied to other databases. After full-text reading, 7 articles were selected for quantitative synthesis. Modified CONSORT checklist of items for reporting in vitro studies of dental materials was used for quality assessment of included studies. Results: Root canal preparation with rotary instrumentation led to lesser apical debris extrusion than manual instrumentation. Self-adjusting file system was associated with the least debris extrusion among all included studies, followed by ProTaper Next, Kedo-S, ProTaper, K3, Mtwo, Revo-S, and Wave One. Conclusion: More apical debris extrusion was seen with manual instrumentation than rotary instrumentation. Furtrhermore, variance in debris extrusion was seen with different rotary file systems.


Assuntos
Cavidade Pulpar , Ápice Dentário , Criança , Humanos , Preparo de Canal Radicular , Dente Decíduo
7.
Niger J Clin Pract ; 25(4): 524-530, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35439914

RESUMO

Background: One of the most important goal of non surgical endodontic retreatment is the successful removal of gutta percha and sealers from the root canal system. A variety of techniques have been recommended for retreatment procedures for the removal of gutta-percha and sealers with or without the help of adjunctive chemical solvents, by using stainless steel hand files or nickel-titanium rotary files, gate glidden burs, heated instruments, ultrasonic instruments, and lasers 1,3. The current advancements in the design of NiTi instruments have proved efficacious in the removal of filling materials from the root canal wall and various studies have also confirmed their cleaning ability and efficacy 4,5. Nevertheless, the use of rotary instrumentation can lead to the formation of dentinal cracks in the root canal dentin. Many researchers have reported the incidence of crack formation and propagation after the procedure with manual, rotary and reciprocating instruments. The behavior of rotary instruments in the generation of defects have been the point of greatest interest during many years 6. These dentinal cracks can be defined as defects with a complete crack line extending from inner root canal space up to the outer surface of the root when the tensile stress in the root canal wall exceeds the tensile stress of dentin 7. Aim: This study was conducted to investigate and to compare the amount of dentinal microcracks formation with various new instrumentation methods and conventional hand filing method. It also looks into amount of gutta-percha removed after retreatment from the canal and the time required for all the instrumentation technique. Methodology: Sixty extracted human maxillary first molars with curved roots were mounted on addition silicone impression material incorporated in an aluminium hollow block, then instrumented using step-back preparation with 35 size K files. Obturation was done using gutta-percha with AH plus sealer. These were stored for 14 days and divided into three groups Mani GPR, Endostar Re Endo and H file and were subjected to retreatment procedures. Retreatment was considered complete when no filling material was observed on the canal wall and the canal was smooth and free of visible debris. The samples were examined under scanning electron microscope and the number of cracks were calculated. The percentage of root canal filling material and time taken was recorded. Statistical Analysis: The data obtained were analyzed by using descriptive statistics, ANOVA (Analysis of Variance), chi-square test and Scheffe's post hoc test through SPSS for window (version 22.0). Result: All the techniques showed similar amount of crack propagation, with no statistical difference between the group. Retreatment done using H Files required more time and removed less material. The coronal third showed less amount of gutta-percha remnants than the apical third in all groups. Conclusion: All the groups showed a similar amount of crack propagation. Less number of cracks were observed in the coronal one third and more amount of cracks were found at the apical third. Endostar RE Endo rotary instrument proved to be most effective and least time-consuming. Hedstrom Files required more time and removed less material.


Assuntos
Guta-Percha , Materiais Restauradores do Canal Radicular , Cavidade Pulpar , Humanos , Retratamento , Obturação do Canal Radicular/métodos , Preparo de Canal Radicular/métodos , Solventes , Titânio
8.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 57(4): 384-389, 2022 Apr 09.
Artigo em Chinês | MEDLINE | ID: mdl-35368164

RESUMO

Objectives: To evaluate the diagnostic consistency of working lengths by observing endodontic files in root canals and periapical subtle structures in digital intraoral radiographs presented in two smartphones, a tablet and a laptop computer. Methods: A dried human skull embedded in an acrylic compound was used for exposing radiographs of the upper and lower second premolars and first molars with two endodontic files (Kerr files size 10 and 15) positioned to the full length of the roots or 1.5 mm short of apexes. A total of 100 radiographs were taken for each of the file sizes. Five observers were asked to assess all the 200 digital radiographs according to a 5-category scale in smartphone A (HUAWEI P9 Plus), smartphjone B (Apple iPhone 7), tablet (Apple iPad 2018) and laptop computer (Lenovo Thinkpad E480), respectively. The gold standard for receiver operating characteristic curve (ROC) analysis was determined with the endodontic Kerr file size 20. A total of 150 roots with files were radiographed, 75 of which with files reaching the radiographic apexes of the respective roots and 75 of which with files 1.5 mm short of the radiographic apexes for each endodontic file size. Results from ROC analysis was analyzed with one-way ANOVA and independent sample t test. Results: For the Kerr file size 10, the area under the ROC curve for laptop, tablet and two smartphones were 0.891±0.037, 0.869±0.037, 0.870±0.017 and 0.849±0.037, while for the Kerr file size 15 the ROC values were 0.957±0.02, 0.961±0.02, 0.961±0.01 and 0.961±0.02, respectively. There were no significant differences for diagnostic accuracy for observing endodontic file positions among digital radiographs presented in the two smartphones, one tablet and one laptop devices (endodontic file size 10: F=1.39, P=0.281; endodontic file size 15: F=0.05, P=0.985). A significant difference was found in the diagnostic accuracy of endodontic file positions between size 10 and 15 files in different display devices (t=-10.65, P<0.001). Conclusions: There was a high diagnostic consistency in the determination of working length and periapical subtle structures of roots by observing digital radiographs displayed on smartphones, tablet and laptop computer.


Assuntos
Instrumentos Odontológicos , Cavidade Pulpar , Cavidade Pulpar/diagnóstico por imagem , Eletrônica , Humanos , Dente Molar , Variações Dependentes do Observador , Preparo de Canal Radicular
9.
Georgian Med News ; (324): 54-63, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35417863

RESUMO

The use of nickel-titanium instruments during endodontic treatment ensures high-quality treatment of root canals. However, during instrumentation in the curved root canals of nickel-titanium instruments experience cyclic loading, which leads to their breakage. The splinter of the tool in the root canal makes it difficult for high-quality processing and obturation of the root canal, which is a very urgent problem. To carry out instrumental processing in canals with various anatomical and topographic features, the files must have phenomenal flexibility, lack of straightening of the canal, and have a safe non-aggressive tip. And for this reason, one of the most popular nickel-titanium COXO SC PRO tools was selected as a study, which, according to the manufacturer, have all the listed properties. The aim of the study is to determine the limit of resistance to cyclic loading and signs of breakage of the nickel-titanium endodontic instrument COXO SC PRO. Sterilization treatment, which is based on autoclaving, significantly reduces the strength characteristics of COXO SC PRO nickel-titanium files, which limits the use of these tools to one-time use without the risk of their breakage.


Assuntos
Níquel , Titânio , Cavidade Pulpar/cirurgia , Desenho de Equipamento , Preparo de Canal Radicular
10.
Rev. Odontol. Araçatuba (Online) ; 43(1): 18-23, jan.-abr. 2022. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-1361569

RESUMO

O presente artigo tem como objetivo relatar um caso clínico de selamento de perfuração com uma técnica de inserção modificada do MTA. Após a anestesia, foi realizado o isolamento absoluto do dente e remoção do material presente na câmara, com o auxílio do inserto ultrassônico Smart X 1. Realizada a limpeza da perfuração utilizando hipoclorito de sódio e modelagem do canal com o instrumento rotatório, a obturação foi concebida com cone de guta percha e cimento AHPlus. Com broca Gates Glidden #3 foi removida a guta percha até o nível da perfuração. Em seguida, 5 mg de MTA branco foi manipulado, de acordo com recomendações do fabricante usando água destilada na proporção 1:1 e inserido na canaleta de uma régua endodôntica. Com o auxílio do instrumento de RHEM o material foi removido da canaleta e inserido na perfuração, concluindo o vedamento da mesma. Conclui-se neste caso clínico que o selamento de perfuração com MTA obteve sucesso clínico e radiográfico, utilizando a técnica de inserção com MTA modificada(AU)


This article aims to report a clinical case of sealing drilling rig with a modified MTA insertion technique. After anesthesia, the absolute isolation of the tooth and removing the material present in the Chamber, with the aid of ultrasonic Insert Smart X 1. Held drilling cleaning using sodium hypochlorite and modeling the canall with the Rotary instrument, the filling was designed with cone of gutta percha and cement AHPlus. With Gates Glidden bur #3 removed the gutta percha drilling level. Then 5 mg of white MTA was handled, according to manufacturer 's recommendations using distilled water in the ratio 1:1 and inserted in a canal endodontic ruler. With the aid of RHEM instrument the material was removed from the canal and inserted in drilling, completing the enclosure. It is concluded in this case that the sealing of drilling with clinical and radiographic success MTA, using the technique of does not avoid inserting rotating instrument. The obturation was performed with gutta percha cone and AHPlus cement. Removed gutta percha with Gates Glidden drill to drill level. Then, 5 mg of white MTA was handled, according to manufacturer 's recommendations using distilled water in the ratio 1: 1. Soon after, it was inserted in the caneleta of an endodontic ruler and with the aid of the instrument of RHEM the material was inserted in the indicated place. It is concluded in this clinical case that the perforation sealing with MTA obtained clinical and radiographic success, using the insertion technique with modified MTA(AU)


Assuntos
Humanos , Masculino , Pessoa de Meia-Idade , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular , Tratamento do Canal Radicular , Hipoclorito de Sódio , Materiais Biocompatíveis , Preparo de Canal Radicular , Guta-Percha
11.
Eur Endod J ; 7(1): 40-46, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35353059

RESUMO

OBJECTIVE: The aim of the study was to examine the efficacy and debris extrusion of XP -Endo Finisher and XP-Endo Finisher R when used in the removal of root canal filling as supplementary files. METHODS: Sixty single-rooted mandibular premolars with single canals were selected. After root canal preparation and obturation, roots were distributed across four groups according to the method of retreatment (n=15): H files, D Race files, D Race +XP-Endo Finisher and D Race+ XP -Endo Finisher R. After retreatment completion, the debris was dried in a hot air oven and weighed. Later, the coronal, middle and apical thirds were assessed using the stereomicroscope. One-way ANOVA followed by Tukey's post hoc test was used to compare across all tested groups. The significance level was set at 0.05 (P<0.05). RESULTS: XP- Endo Finisher R exhibited significantly cleaner root canals than XP- Endo Finisher (41.58±10.56 and 52.68±9.94 respectively) and extruded more debris apically (16.56%±4.07 and 12.82%±3.41 respectively) (P<0.001). CONCLUSION: Although none of the tested approaches rendered root canals free of filling remnants, the XP-Endo Finisher R cleaned canals significantly more than the XP-Endo Finisher and extruded more debris apically.


Assuntos
Cavidade Pulpar , Materiais Restauradores do Canal Radicular , Instrumentos Odontológicos , Obturação do Canal Radicular , Preparo de Canal Radicular
12.
Eur Endod J ; 7(1): 33-39, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35353061

RESUMO

OBJECTIVE: The objective of the present study was to assess the effect of using Reciproc (RC), (VDW GmbH, Munich, Germany) files with reciprocating motion versus Twisted File Adaptive (TFA, Kerr, Orange, California, USA) system with adaptive motion on post-instrumentation and post-obturation pain of necrotic mandibular molars. METHODS: Fifty-eight patients with mandibular molar assessed at 3 intervals; 6, 12 and, 24 hrs. Mann Whitney U and Friedman test was used for data analysis, and the significance level was set to (P≤0.05). RESULTS: There was no statistically significant difference in the mean values of post-instrumentation pain at each time interval for the RC and TFA groups (P>0.05). Pain decreased in each group with a statistically significant difference from preoperative condition to all six post-instrumentation time intervals (P<0.001). In each group, post-instrumentation mean pain values at 6, 12, and 24 hrs were higher than post-obturation pain values at 6, 12, and 24 hrs with a statistically significant difference (P<0.001). CONCLUSION: TFA and RC had a similar impact on post-instrumentation and post-obturation pain. The post-instrumentation pain was higher than post-obturation pain in both groups.


Assuntos
Dente Molar , Preparo de Canal Radicular , Instrumentos Odontológicos , Humanos , Dente Molar/cirurgia , Movimento (Física) , Dor Pós-Operatória/etiologia
13.
Eur Endod J ; 7(1): 1-10, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35353062

RESUMO

Minimally invasive endodontic access cavities have gained popularity in academic discussions for their clinical applications in recent years. Although some studies showed an improved fracture resistance of endodontically-treated teeth accessed with a minimally invasive access cavity design, the resulting effectiveness and efficiency of subsequent root canal treatment procedures may be impaired. Aspects that may be impaired are canal detection and negotiation, chemomechanical debridement of the root canal system, quality of the obturation. These are potentially complicated by the increased incidence of procedural mishaps and compromised aesthetic outcomes. In addition, the inherent flaws presented in the methodology of some in vitro studies and the lack of a universal classification system are also of concern. This literature review aims to present a comprehensive overview of the development of the minimally invasive endodontic access cavity and summarise the currently available from a clinical context.


Assuntos
Cárie Dentária , Dente não Vital , Estética Dentária , Humanos , Preparo de Canal Radicular/métodos , Tratamento do Canal Radicular
14.
Int Endod J ; 55 Suppl 2: 281-294, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35347726

RESUMO

Outcome studies have repeatedly shown that the apical endpoint of root canal preparation and filling is a determinate factor for the outcome of root canal treatment. Accurate determination of root canal length enhances the efficacy of chemo-mechanical disinfection and prevents over-/under-instrumentation and over-/under-filling in relation to the canal terminus. Long and short root canal fillings are consistently reported to be associated with higher rates of post-treatment endodontic disease. Although standards for undertaking and reporting diagnostic accuracy studies are available, publications dealing with the determination of root canal length are highly heterogeneous and describe procedures inconsistently. The aim of this review is to critically assess the methodology of publications in the past three decades. The process of planning, performing and analysing working length studies are presented stepwise with suggestions to optimize research methods.


Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Modelos Teóricos , Odontometria , Tratamento do Canal Radicular , Ápice Dentário
15.
J Endod ; 48(5): 659-668, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35227729

RESUMO

INTRODUCTION: The purpose of this study was to evaluate the influence of a contracted endodontic cavity (CEC) on dentin preservation, biomechanical property, and instrumentation efficacy of first permanent molars in comparison with a traditional endodontic cavity (TEC). METHODS: Forty-eight extracted intact maxillary and mandibular first molars were selected and scanned by micro-computed tomographic (micro-CT) imaging. Each tooth type was anatomically matched and assigned to the CEC group or the TEC group (n = 12). After root canal instrumentation with the ProGlider (Dentsply Maillefer, Ballaigues, Switzerland) and WaveOne Gold (Dentsply Maillefer), the specimens were scanned by micro-CT again. Pre- and postpreparation micro-CT imaging was used to evaluate the dentin preservation and instrumentation efficacy. The results on volume and thickness reduction in the coronal dentin and pericervical dentin (PCD), root canal volume and surface area, percentage of unprepared surface area, canal transportation and centering ratio, and canal wall thickness in the "danger zone" were measured and analyzed with the Shapiro-Wilk and independent sample t tests. Based on micro-CT imaging of maxillary and mandibular first molars, CEC and TEC models were constructed on the intact tooth, and 2 different static loads were applied to the occlusal load points. The stress distribution patterns and von Mises stress on the occlusal surface and cervical region were assessed by 3-dimensional finite element analysis. RESULTS: The CEC had a significantly lower volume and thickness reduction of coronal dentin and PCD above the alveolar crest compared with the TEC group (P < .05), whereas no difference was observed in PCD below the alveolar crest between the 2 groups (P > .05). There was no difference regarding all instrumentation efficacy outcomes (root canal volume and surface area, percentage of unprepared surface area, canal transportation and centering ratio, and canal wall thickness) in the danger zone between the 2 groups (P > .05). The CEC effectively reduced the maximum von Mises stress and stress concentration area on the occlusal surface and cervical region compared with the TEC. CONCLUSIONS: The CEC preserved more coronal dentin and PCD above the alveolar crest and thus reduced stress concentration on the occlusal surface and cervical region. The CEC had no significant adverse effects on the instrumentation efficacy compared with the TEC given that the instrumentation procedures were performed with ProGlider and WaveOne Gold files.


Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Cavidade Pulpar/diagnóstico por imagem , Dentina/diagnóstico por imagem , Ouro , Microtomografia por Raio-X/métodos
16.
Sci Rep ; 12(1): 4894, 2022 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-35318365

RESUMO

This study compared the effectiveness of GentleWave system (GWS) and passive ultrasonic irrigation (PUI) in removing lipopolysaccharides (LPS) from infected root canals after minimally invasive (MIT) and conventional instrumentation (CIT) techniques. Sixty first premolars with two roots were inoculated with fluorescent LPS conjugate (Alexa Fluor 594). Of those, twelve were dentin pretreated, inoculated with fluorescent LPS conjugate, and submitted to confocal laser scanning microscopy (CLSM) to validate the LPS-infection model. Forty-eight teeth were randomly divided into treatment groups: GWS + MIT, GWS + CIT, PUI + MIT, and PUI + CIT (all, n = 12). Teeth were instrumented with Vortex Blue rotary file size 15/0.04 for MIT and 35/0.04 for CIT. Samples were collected before (s1) and after a root canal procedure (s2) and after cryogenically ground the teeth (s3) for intraradicular LPS analysis. LPS were quantified with LAL assay (KQCL test). GWS + MIT and GWS + CIT were the most effective protocols against LPS, with no difference between them (p > 0.05). PUI + CIT was more effective than PUI + MIT (p < 0.05) but less effective than GWS + MIT and GWS + CIT. GWS was the most effective protocol against LPS in infected root canals using MIT and CIT techniques.


Assuntos
Irrigantes do Canal Radicular , Preparo de Canal Radicular , Cavidade Pulpar , Lipopolissacarídeos , Hipoclorito de Sódio , Ultrassom
17.
Sci Rep ; 12(1): 4897, 2022 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-35318418

RESUMO

We investigated the biofilm removal effects of laser activated irrigation (LAI) using a pig model, focusing on the impact of the fiber tip position, and used a high-speed camera to observe the occurrence and positioning of the cavitation associated with laser irradiation. A total of 16 roots of deciduous mandibular second premolars from 4 pigs were used. After a pulpectomy, the canals were left open for 2 weeks and sealed for 4 weeks to induce intraradicular biofilm. Root canal irrigation was then performed with Er:YAG laser activation. The fiber tip was inserted at two different positions, i.e., into the root canal in the intracanal LAI group and into the pulp chamber in the coronal LAI group. Intracanal needle irrigation with saline or 5% NaOCl was utilized in the positive control and conventional needle irrigation (CNI) groups. SEM and qPCR were carried out to evaluate treatment efficacy. Statistical analysis was performed using ANOVA and a Tukey-Kramer post-hoc test for qPCR and with a Steel-Dwass test to compare the SEM scores, with α = 0.05. A high-speed camera was used to observe the generation of cavitation bubbles and the movement of the induced bubbles after laser irradiation. The intracanal and coronal LAI groups showed significantly lower amounts of bacteria than either the positive control or CNI groups. There was no significant difference found between the intracanal and coronal LAI groups. SEM images revealed opened dentinal tubules with the destruction of biofilm in both LAI groups. High-speed camera images demonstrated cavitation bubble production inside the root canal after a single pulse irradiation pulse. The generated bubbles moved throughout the entire internal multi-rooted tooth space. Coronal LAI can generate cavitation in the root canal with a simply placed fiber inside the pulp chamber, leading to effective biofilm removal. This method could thus contribute to the future development of endodontic treatments for refractory apical periodontitis caused by intraradicular biofilm.


Assuntos
Lasers de Estado Sólido , Dente , Animais , Biofilmes , Lasers de Estado Sólido/uso terapêutico , Irrigantes do Canal Radicular , Preparo de Canal Radicular , Tratamento do Canal Radicular , Hipoclorito de Sódio/farmacologia , Suínos
18.
Aust Endod J ; 48(1): 202-218, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35255170

RESUMO

This systematic review and meta-analysis evaluated whether single-file endodontic instrumentation systems with the reciprocating type of motion are responsible for more debris extrusion than single-file endodontic instrumentation systems with the full rotational type of motion. Electronic and manual searches were performed following the recommendations of Preferred Reporting Items for Systematic Reviews and Meta-Analysis - PRISMA. We included studies comparing rotary (Neoniti and/ OneShape) versus reciprocating (WaveOne and/ Reciproc) systems. We evaluated the quality of studies and performed statistical analysis using R-Project software. Eight studies of high quality were included to perform the meta-analysis. Subgroup analysis was also done. The overall risk of bias was too low. In conclusion, single-file reciprocating systems tend to generate more extrusion of debris than single-file rotary systems.


Assuntos
Preparo de Canal Radicular , Ápice Dentário , Instrumentos Odontológicos , Projetos de Pesquisa , Rotação
19.
Int Endod J ; 55(5): 531-543, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35263803

RESUMO

AIM: To evaluate the effect of various rotational motions on the torque/force generation, surface wear, and shaping ability of the ProGlider glide path instrument (Dentsply Sirona). METHODOLOGY: Mesiobuccal and mesiolingual canals of mandibular molars were selected based on the canal volume, length, angle of curvature (25°-40°), and radius of curvature (4-8 mm) after micro-computed tomographic scanning. The samples were randomly assigned to four groups (n = 13, each) according to movement kinematics [continuous rotation (CR; 300 rpm), optimum torque reverse motion (OTR; 180° forward and 90° reverse when torque >0.4 N cm), time-dependent reciprocal motion (TmR; 180° forward and 90° reverse), and optimal glide path motion (OGP; a combination of 90° forward, 90° reverse, 90° forward, and 120° reverse)]. Instrumentation was performed with an automated root canal instrument and torque/force analysing device. Maximum torque/force values, canal volume changes, and canal-centring ratios at 1, 3, 5, and 7 mm were evaluated. Surface defects (pits, grooves, microcracks, blunt cutting edges, and disruption of cutting edges) and spiral distortion on the ProGlider instrument were scored at the tip and 5 mm short of the tip before and after five consecutive uses with scanning electron microscopy. The Kruskal-Wallis test followed by Dunn's post-test with Bonferroni correction and Wilcoxon signed-rank test were used to analyse the data (α = 0.05). RESULTS: Optimal glide path motion generated significantly less clockwise torque and greater upward force than other groups (p < .05). OGP resulted in significantly fewer surface defects than CR (p < .05). In OGP and CR, the tip exhibited more surface defects than 5 mm short of the tip (p < .05). CR resulted in greater volume changes than OGP and TmR (p < .05) and greater centring ratios (i.e., more deviation) than OGP at 1 mm and OTR at 3 mm (p < .05). CONCLUSIONS: Under laboratory conditions using the ProGlider instrument, OGP generated significantly less clockwise torque and greater upward force than the other rotatory motions. OGP generated fewer superficial defects than CR, and the three modes of reciprocal rotation better maintained the apical curvature of root canals than CR with the ProGlider instrument.


Assuntos
Níquel , Preparo de Canal Radicular , Fenômenos Biomecânicos , Cavidade Pulpar , Desenho de Equipamento , Titânio , Torque
20.
PLoS One ; 17(3): e0265226, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35303004

RESUMO

Nickel-titanium (NiTi) instruments used to treat root canal infections are affected by autoclave sterilization in various ways. The aim of this study was to compare the effect of autoclave sterilization on two NiTi rotary instruments that undergo different manufacturing treatments: The electro-polished Race and the heat-treated Race Evo, using scanning electron microscope analysis. In this in-vitro study, Race and Race-Evo instruments were subjected to a number of autoclaving cycles (0, 1, 3, 5, and 10). Scanning electron microscopy images were obtained at 3 mm from the tip of the file at 450x and 1000x magnifications. Surface roughness parameters were measured using ImageJ software. The results showed that autoclave sterilization caused a significant decrease in conventional NiTi Race surface roughness. While in Race Evo, surface roughness increased following the first autoclaving cycle. After 10 autoclaving cycles, surface roughness significantly decreased for both Race and Race Evo files.


Assuntos
Níquel , Titânio , Ligas Dentárias , Instrumentos Odontológicos , Cavidade Pulpar , Desenho de Equipamento , Temperatura Alta , Teste de Materiais , Preparo de Canal Radicular , Esterilização/métodos , Propriedades de Superfície
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