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1.
Rev. cuba. estomatol ; 57(3): e2945, jul.-set. 2020. tab, graf
Artigo em Espanhol | LILACS, CUMED | ID: biblio-1126522

RESUMO

RESUMEN Introducción: Los selladores endodónticos desempeñan un papel crucial en la obturación, dado que dichos materiales, no solo actúan en el momento de su aplicación, sino que continúan haciéndolo con posterioridad, protegiendo al periodonto apical contra los organismos microbianos presentes. Precisamente, una de las propiedades deseadas en los selladores endodónticos es que posean acción antimicrobiana, para eliminar las bacterias remanentes después de la irrigación e instrumentación. Objetivo: Realizar una revisión sistemática del efecto antibacteriano de diferentes selladores endodónticos más utilizados en odontología contra Enterococcus faecalis (E. faecalis). Métodos: Esta revisión sistemática se llevó a cabo siguiendo los lineamientos PRISMA. La búsqueda se realizó en las bases de datos PubMed y Science Direct. Se revisaron los artículos de estudios antimicrobianos in vitro de selladores endodónticos y se excluyeron aquellos de fuente secundaria, como los de revisión de la literatura, así como artículos sobre cementos para otros usos. Desarrollo: Los cementos a base de hidróxido de calcio, resina o biocerámicos son biocompatibles y presentan algún porcentaje de actividad antimicrobiana; sin embargo, se puede apreciar que existe variabilidad en los resultados obtenidos en los estudios incluidos en la revisión, debido al uso de condiciones diferentes para la evaluación antibacteriana, excepto en los selladores endodónticos a base de silicona, los cuales tuvieron, de forma consistente, un efecto antibacterial nulo contra E. faecalis. Conclusión: De acuerdo a la bibliografía revisada, los selladores AH Plus, AH 26, TotalFill, BC Sealer y MTA Fillapex exhibieron efecto antimicrobiano, sin embargo, algunos de ellos mostraron escasa actividad contra E. faecalis(AU)


ABSTRACT Introduction: Endodontic sealers play a crucial role in sealing, for they not only act at the moment of their application, but continue to do so later, protecting the apical periodontium against microbial organisms. One of the properties desired in endodontic sealers is precisely their antimicrobial action against bacteria remaining after irrigation and instrumentation. Objective: Carry out a systematic review about the antibacterial effect of the endodontic sealers most commonly used in dental practice against Enterococcus faecalis (E. faecalis). Methods: The systematic review was based on PRISMA guidelines. The search was conducted in the databases PubMed and Science Direct. Papers were reviewed which dealt with in vitro antimicrobial studies about endodontic sealers, excluding secondary sources such as literature reviews and papers about cements used for other purposes. Discussion: Cements based on calcium hydroxide, resin or bioceramic are biocompatible and display some percentage of antimicrobial activity. However, variability was observed in the results obtained by the studies in the review, due to the use of different conditions for antibacterial evaluation, except for silicone-based endodontic sealers, which consistently displayed no antibacterial activity against E. faecalis. Conclusion: According to the bibliography reviewed, the sealers AH Plus, AH 26, TotalFill, BC Sealer and MTA Fillapex had an antimicrobial effect. However, some of them displayed scant activity against E. faecalis(AU)


Assuntos
Humanos , Selantes de Fossas e Fissuras/uso terapêutico , Tratamento do Canal Radicular/métodos , Cimentos Dentários/uso terapêutico , Antibacterianos/efeitos adversos , Literatura de Revisão como Assunto , Bases de Dados Bibliográficas
2.
Pain Res Manag ; 2020: 5853412, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32676136

RESUMO

This equivalence, randomized, clinical trial aimed to compare the postoperative pain of root canal therapy (RCT) with pulpotomy with mineral trioxide aggregate (PMTA) or calcium-enriched mixture (PCEM) in permanent mature teeth. In seven academic centers, 550 cariously exposed pulps were included and randomly allocated into PMTA (n = 188), PCEM (n = 194), or RCT (n = 168) arms. Preoperative "Pain Intensity" (PI) on Numerical Rating Scale and postoperative PIs until day 7 were recorded. Patients' demographic and pre-/intra-/postoperative factors/conditions were recorded/analysed. The arms were homogeneous in terms of demographics. The mean preoperative PIs were similar (P=0.998), the mean sum PIs recorded during 10 postoperative intervals were comparable (P=0.939), and the trend/changes in pain relief were parallel (P=0.821) in all study arms. The incidences of preoperative moderate-severe pain in RCT, PMTA, and PCEM arms were 56.5%, 55.7%, and 56.7%, which after 24 hours considerably decreased to 13.1%, 10.6%, and 12.9%, respectively (P=0.578). The time span of endodontic procedures was statistically different; RCT = 69.73, PMTA = 35.37, and PCEM = 33.62 minutes (P < 0.001). Patients with greater preoperative pain, symptomatic apical periodontitis, or presence of PDL widening suffered more pain (P=0.002, 0.035, and 0.023, resp.); however, other pre-/intra-/postoperative factors/conditions were comparable. Pulpotomy with MTA/CEM and RCT demonstrate comparable and effective postoperative pain relief.


Assuntos
Dor Pós-Operatória/etiologia , Pulpotomia/métodos , Materiais Restauradores do Canal Radicular/uso terapêutico , Tratamento do Canal Radicular/métodos , Adulto , Compostos de Alumínio/uso terapêutico , Compostos de Cálcio/uso terapêutico , Cimentos Dentários/uso terapêutico , Combinação de Medicamentos , Feminino , Humanos , Masculino , Dente Molar , Óxidos/uso terapêutico , Dor Pós-Operatória/epidemiologia , Prevalência , Pulpotomia/efeitos adversos , Tratamento do Canal Radicular/efeitos adversos , Silicatos/uso terapêutico , Resultado do Tratamento
3.
Oper Dent ; 45(5): 473-483, 2020 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-32352353

RESUMO

CLINICAL RELEVANCE: At 24 months, the dentin pretreatment with epigallocatechin-3-gallate did not impair the clinical performance of the adhesive Single Bond Universal regardless of the bonding strategy used. SUMMARY: Purpose: To evaluate the two-year effect of dentin pretreatment with epigallocatechin-3-gallate (EGCG) on the clinical performance of restorations of noncarious cervical lesions (NCCLs) with Single Bond Universal, applied in two different modes (self-etch and etch-and-rinse).Methods and Materials: In this randomized clinical trial, 33 volunteers were selected, and 156 NCCLs were assigned to four groups: ER, etch-and-rinse; ER-EGCG, 0.1% EGCG dentin pretreatment + etch-and-rinse; SE, self-etch; and SE-EGCG, 0.1% EGCG dentin pretreatment + self-etch. The NCCLs were restored with a nanofilled resin composite and evaluated at baseline and at six, 12, 18, and 24 months using FDI criteria for retention, marginal staining, marginal adaptation, caries, and postoperative sensitivity. Two evaluators were blinded to the treatments performed, and impressions were taken for resin replicas to allow indirect observations. Statistical analyses were performed with Kruskal-Wallis and McNemar tests with a significance level of 5%.Results: Six restorations (one from ER, two from SE, one from ER-EGCG, and two from SEEGCG) were lost at 24 months with no significant differences (p>0.05). The retention rates were 97.0% (ER and ER-EGCG), 94.1% (SE), and 94.2% (SE-EGCG). For marginal adaptation, a significant difference was detected between the baseline and 24 months for the SE group (p=0.0313). There were no statistical differences among all other evaluated criteria at 24 months, neither for each group at baseline nor for 24-month comparisons (p>0.05).Conclusions: The pretreatment with EGCG provided no benefit in the clinical performance of the adhesive regardless of the bonding strategy used. In addition, it adds an additional required step to the restorative procedure.


Assuntos
Catequina , Colagem Dentária , Resinas Compostas , Cimentos Dentários/uso terapêutico , Adaptação Marginal Dentária , Restauração Dentária Permanente , Dentina , Adesivos Dentinários , Humanos , Cimentos de Resina
4.
Gen Dent ; 68(3): 46-49, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32348243

RESUMO

Three-dimensional sealing of root canals is essential for long-term endodontic success. It is sometimes difficult to achieve a fluid-tight seal in cases such as furcation defects, resorption lesions, open apices, and root fractures. Such cases require restorative materials that not only are biocompatible and well accepted by the surrounding periodontium but also will set in the wet oral environment without losing their properties. This case series describes management of an open apex, a furcal perforation, and a horizontal root fracture with a bioactive calcium silicate‒based cement (Biodentine) as root repair material. To prevent extrusion of the cement, platelet-rich fibrin was used as an external matrix. The patients were followed for 2-3 years, and the teeth demonstrated remarkable healing.


Assuntos
Fibrina Rica em Plaquetas , Materiais Restauradores do Canal Radicular/uso terapêutico , Cálcio , Compostos de Cálcio/uso terapêutico , Cimentos Dentários/uso terapêutico , Cimentos de Ionômeros de Vidro , Humanos , Silicatos/uso terapêutico
5.
Endodoncia (Madr.) ; 37(2): 22-28, sept. 2019. graf, ilus
Artigo em Espanhol | IBECS | ID: ibc-186296

RESUMO

Objetivos. El propósito de este trabajo fue evaluar los efectos biológicos de MTA Repair HP y ProRoot MTA en células madre procedentes de ligamento periodontal (hPDLSCs) tras ser ex-puestos los cementos a ambiente ácido y neutro. Material y Métodos: Discos de cada material (n=30) fueron ex-puestos a un tampón fosfato-salino (pH 7.4) o a ácido butírico (pH 5.2) durante 7 días, posteriormente se realizaron pruebas biológicas in vitro usando hPDLSCs. A partir de eluatos de los diferentes materiales de obturación a retro, se analizaron pruebas de viabilidad celular y apoptosis. Para evaluar la adhesión celular, hPDLSCs se sembraron directamente sobre la superficie de los materiales y se observaron bajo microscopio electrónico de barrido. Para analizar estadísticamente los resultados se usaron los test ANOVA y Tukey test (p < 0.05). Resultados: Los cementos endodónticos expuestos a ambiente ácido mostraron un similar grado de adhesión celular, y sorprendentemente, MTA Repair HP a pH 5.2 exhibió una mayor viabilidad celular que ProRootMTA (p<0.05). A pH 7.4, ProRooT MTA obtuvo una tasa mayor de viabilidad celular que con MTA Repair HP. Conclusiones: Los materiales ProRoot MTA y MTA Repair HP presentaron adecuadas propiedades biológicas en los diferentes ambientes, en términos de viabilidad celular, apoptosis y adhesión


Objectives: The purpose of this work was to evaluate the biolo-gical effects of MTA Repair HP and ProRoot MTA on stem cells from periodontal ligament (hPDLSCs) after exposure to acidic and neutral environments. Material and Methods: Discs of each material (n=30) were ex-posed to phosphate buffered saline (pH = 7.4) or butyric acid (pH = 5.2) for 7 days, and biological testing was carried out in vitro on hPDLSCs. Cell viability and apoptosis assays were performed using eluates of each root-end filling material. To evaluate cell attachment to the different materials, hPDLSCs were directly seeded onto the material surfaces and analyzed by scanning electron microscopy. Statistical differences were assessed by ANOVA and Tukey test (p < 0.05).Results: Endodontic cements exposure to an acidic environment showed a similar degree of cell adherence, and, surprisingly, MTA Repair HP exhibited higher cell viability rates at pH 5.2 than Pro-Root MTA, whereas ProRoot MTA 7.4 showed higher cell viability rates than MTA Repair HP. Conclusions: Adequate biological properties of ProRoot MTA and MTA Repair HP in terms of cell viability, cell death and cell attach-ment were observed in both environments


Assuntos
Humanos , Adolescente , Adulto Jovem , Adulto , Cimentos Dentários/uso terapêutico , Concentração de Íons de Hidrogênio , Ligamento Periodontal , Células-Tronco , Reações Biológicas , Separação Celular , Sobrevivência Celular , Apoptose , Materiais Restauradores do Canal Radicular/classificação , Materiais Restauradores do Canal Radicular/uso terapêutico , Obturação do Canal Radicular/métodos
6.
Endodoncia (Madr.) ; 37(2): 40-44, sept. 2019. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-186298

RESUMO

Objetivo. Evaluar la interfase entre tres cementos biocerámicos y la pared del conducto radicular, comparándolos con un cemento de resina. Material y Métodos: Se seleccionaron 80 dientes unirradiculares, los cuales se dividieron en 4 grupos de acuerdo al cemento de obturación: 1 (MTA FillApex), 2 (EndoSequence BC Sealer), 3 (Bio Root) y 4 (AHPlus). Los dientes se decoronaron dejando una longitud estándar de 15 mm; se instrumentaron con el sistema Mtwo hasta la lima 35/.04. Se irrigó con hipoclorito al 5’25%, EDTA al 17% y se finalizó la irrigación con solución salina. La obturación se realizó con gutapercha 35/.04 y técnica de cono único. Las muestras fueron cortadas a 3, 5 y 8 mm del ápice y se observaron con un estereomicroscopio. Obtenidas las imágenes, se midió el perímetro del conducto en el que hubo adaptación del cemento (expresado como porcentaje respecto a la longitud total del perímetro del conducto) a tres niveles: apical, medio y coronal. Los resultados se analizaron mediante el test de Kruskal Wallis, con una significación de p < 0,05. Resultados: El grupo 1 presentó significativamente peor adaptación a las paredes dentinarias que el resto de cementos estudia-dos en todos los tercios (apical, 63,71%; medio, 69,53%; coronal, 50,82%). Aunque no se encontraron diferencias significativas, el tercio que mejor adaptación presentó fue el apical. Conclusiones: MTA Fillapex, globalmente, se comportó significativamente peor que los otros cementos evaluados. No existen diferencias significativas entre la adaptación a las paredes dentinarias del BioRoot y el Endosequence y el AHPlus


Objective: To evaluate the interface between three bioceramic-based sealers and the root canal wall, comparing them with a resin-based sealer. Material and Methods: 80 single-rooted teeth were selected and divided into 4 groups according to the sealer: 1 (MTA FIllapex), 2 (EndoSequence BC Sealer), 3 (Bio Root) y 4 (AHPlus). Crowns were sectioned at 15mm from the apex; all the roots were instrumented with Mtwo system until 35/.04 file. Canals were irrigated with 5’25% sodium hypochlorite, 17% EDTA and a final rinse with saline solution. The roots were obturated with 35/.04 gutta-percha and single-cone technique. The samples were sectioned at 3, 5 and 8 mm from the apex and were observed with a stereo microscope. The images taken were analyzed; the root canal perimeter where there was adaptation was measure (expressed as a percentage regarding to the root canal total perimeter) at three levels: apical, middle and coronal. The results were analyzed statistically by the Kruskal Wallis test with a p<0,05 significance level. Results: Group 1 presented significantly worst adaptation to the canal walls than the other studied sealers (apical, 63,71%; middle, 69,53%; coronal, 50,82%). The third with the worst adaptation was the apical, even though there were no statistical differences. Conclusions: MTA Fillapex, overall, behaved worse than the other sealers studied. There was no statistical difference between AH Plus, BioRoot and EndoSequence on the canal wall adaptation


Assuntos
Humanos , Adaptação Marginal Dentária , Cimentos Dentários/uso terapêutico , Dente/inervação , Materiais Biocompatíveis/uso terapêutico , Cimentos Dentários/metabolismo , Materiais Restauradores do Canal Radicular , Guta-Percha , Ápice Dentário , Microscopia Eletrônica , Dente/anatomia & histologia
7.
J Appl Oral Sci ; 27: e20180700, 2019 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-31166415

RESUMO

INTRODUCTION: Alternatives for the treatment of caries disease, such as minimally invasive approaches, have been developed in recent years. OBJECTIVE: To carry out clinical and radiographic evaluations of three cavity liners after selective caries removal. METHODOLOGY: Thirty-six primary molars with deep occlusal caries lesions without pulp involvement (from children of both genders, aged between 5 and 8 years) were randomly divided into the following groups: calcium hydroxide cement (CHC) group; mineral trioxide aggregate (MTA) group and Portland cement with added zirconium oxide (PCZ) group. The following-up period was 6- and 12-month. The clinical and radiographic success rates were evaluated through chi-square test. The radiographic measurements were compared by ANOVA followed by Tukey's test (p<0.05). RESULTS: Thirty-six patients were included, but thirty-four returned for 12-month follow-up. The overall success rate of the therapy for the three groups was 94.11% and no statistically significant differences occurred in the comparison among groups (p>0.05). Nineteen radiographs were selected to measure the dentin barrier thickness. The intragroup comparison presented a statistically significant increase of the dentin barrier for all groups, at 12-month follow-up. However, the MTA group showed increase of the dentin barrier, over time, 6- to 12-month follow-up. The intergroup comparison revealed no statistically significant differences (p>0.05). CONCLUSION: The clinical and radiographic data showed that all cavity liners provided effective treatment of primary teeth after selective caries removal.


Assuntos
Compostos de Alumínio/uso terapêutico , Compostos de Cálcio/uso terapêutico , Hidróxido de Cálcio/uso terapêutico , Cárie Dentária/terapia , Forramento da Cavidade Dentária/métodos , Óxidos/uso terapêutico , Silicatos/uso terapêutico , Zircônio/uso terapêutico , Análise de Variância , Criança , Pré-Escolar , Cárie Dentária/diagnóstico por imagem , Cimentos Dentários/uso terapêutico , Cavidade Pulpar/anatomia & histologia , Cavidade Pulpar/efeitos dos fármacos , Restauração Dentária Permanente/métodos , Combinação de Medicamentos , Feminino , Seguimentos , Humanos , Masculino , Radiografia Dentária , Fatores de Tempo , Dente Decíduo , Resultado do Tratamento
8.
Braz Oral Res ; 33: e038, 2019 May 27.
Artigo em Inglês | MEDLINE | ID: mdl-31141036

RESUMO

This study aimed to evaluate the bond strength of a universal adhesive system to enamel surrounding real-life carious cavities. Twenty-eight permanent molars (n = 7) with carious lesions in dentin were subjected to selective carious tissue removal to firm dentin and had their crowns sectioned longitudinally. A universal adhesive system (Single Bond Universal [SBU] used in either etch-and-rinse and self-etch strategies) was compared with an etch-and-rinse Adper Single Bond 2 (ASB) and a self-etch Clearfil SE Bond (CSE) adhesive systems (control systems). Adhesives were applied on the enamel, assumed demineralized, surrounding the cavity margins and on sound enamel (control substrate). Composite cylinders were built (0.72 mm2) and microshear bond strength (µSBS) test was performed after 24 h of water storage. The µSBS values (MPa) were analyzed using two-way ANOVA and Tukey's post hoc tests (α = 0.05). Bond strength values obtained in demineralized enamel surrounding carious cavity margins were significantly lower than that obtained in sound enamel (distant from carious cavity margins) (p = 0.035). The bonding strategy of the SBU did not influenced the bond strength values, which were higher than that obtained with ASB. CSE showed similar µSBS values to ASB and SBU in the self-etch mode. In conclusion, the bond strength to enamel assumed demineralized is lower than to sound enamel. The enamel surrounding carious cavities jeopardize the bonding of universal adhesive system. The bond strength of universal adhesive is similar, regardless to bonding strategy.


Assuntos
Bis-Fenol A-Glicidil Metacrilato/química , Colagem Dentária/métodos , Cárie Dentária/terapia , Cimentos Dentários/química , Esmalte Dentário/efeitos dos fármacos , Análise de Variância , Bis-Fenol A-Glicidil Metacrilato/uso terapêutico , Cimentos Dentários/uso terapêutico , Dentina/efeitos dos fármacos , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Distribuição Aleatória , Reprodutibilidade dos Testes , Cimentos de Resina/química , Cimentos de Resina/uso terapêutico , Resistência ao Cisalhamento , Estatísticas não Paramétricas , Propriedades de Superfície
9.
Am J Orthod Dentofacial Orthop ; 155(4): 523-528, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30935607

RESUMO

OBJECTIVE: To compare the clinical bracket failure rate and bonding time differences between Adhesive Precoated Flash-Free (APCF) and Adhesive Precoated Plus (APCP) bracket systems. METHODS: Thirty-three patients (7 male and 26 female) with a mean age of 17.2 ± 3.6 years and permanent dentition were included in the study. Total of 660 brackets were bonded by 1 operator with the use of a split-mouth design, and bracket failure rates were observed over 6 months. Bracket bonding time of each group was also evaluated. Bracket failure rates were evaluated by means of chi-square test. One-way analysis of variance (ANOVA) and Tukey honestly significant difference tests were used to evaluate the bonding time differences between groups. RESULTS: The overall, APCF, and APCP bracket failure rates were 1.21%, 1.81%, and 1.51%, respectively. Chi-square test revealed significant differences (P <0.01) between groups in bracket failure rates. The upper left APCP group showed significantly (P <0.05) more failure than the other groups. One-way ANOVA test (P <0.001) showed statistically significant bonding time differences between groups. Bonding time of APCF brackets was significantly shorter than the bonding time of APCP brackets for the same quadrants. Chi-square test did not reveal significant differences (P >0.05) between groups according to adhesive remnant index scores. CONCLUSIONS: Compared with APCP brackets, APCF brackets can reduce the bonding time without increasing bracket failure rate.


Assuntos
Colagem Dentária , Cimentos Dentários/uso terapêutico , Braquetes Ortodônticos , Colagem Dentária/efeitos adversos , Colagem Dentária/métodos , Cimentos Dentários/efeitos adversos , Feminino , Humanos , Masculino , Má Oclusão de Angle Classe I/terapia , Má Oclusão de Angle Classe II/terapia , Braquetes Ortodônticos/efeitos adversos , Falha de Tratamento , Adulto Jovem
10.
Bull Tokyo Dent Coll ; 60(1): 17-27, 2019 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-30700646

RESUMO

The purpose of this study was to investigate the influence of differences in axial thickness and type of cement on fracture load in CAD/CAM crowns. Assuming the mandibular first premolar to be the abutment tooth, 4 types of crown with different axial thicknesses and radii of curvature were prepared. To unify external design, the morphology of the crown margins was set at 0.15, 0.30, 0.45, or 0.60 mm, thus maintaining uniform axial form of the crowns. The CAD/CAM crowns and abutment teeth were bonded using each of 2 types of resin cement or polycarboxylate cement. The fracture load value was measured using a universal testing machine and the destruction phase observed.No significant difference was observed with change in axial thickness. The fracture load values with each of the 2 types of resin cement used were significantly higher than that with polycarboxylate cement (p<0.01). These results suggest that the fracture load values of CAD/CAM crowns are not influenced by differences in the axial thickness of the crown, and that they are higher when bonding is achieved with resin rather than polycarboxylate cement.


Assuntos
Resinas Compostas/uso terapêutico , Desenho Assistido por Computador , Coroas , Cimentos Dentários/uso terapêutico , Planejamento de Prótese Dentária/métodos , Falha de Restauração Dentária , Análise do Estresse Dentário , Humanos , Suporte de Carga
11.
J Prosthodont ; 28(1): e74-e81, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29314449

RESUMO

PURPOSE: To assess the correspondence of shades between try-in pastes and resin cements and their influence on the final color of veneers. MATERIALS AND METHODS: Bovine teeth (n = 140) were prepared and divided into 2 groups (a or b) according to ceramic veneer thickness (0.35 or 0.70 mm). Seventy teeth (n = 70) were distributed in 7 groups (groups 1 to 7a and groups 1 to 7b; n = 10). Try-in pastes and their corresponding resin cements were used according to the value: groups 1a and 1b (value -3); groups 2a and 2b (-2); groups 3a and 3b (-1); groups 4a and 4b (0); groups 5a and 5b (+1); groups 6a and 6b (+2); groups 7a and 7b (+3). Color measurements were performed with spectrophotometer, and the coordinates L* , a* , and b* were obtained. The final color change (ΔE) was calculated from these coordinates: ΔE0 (trial - substrate), ΔE1 (cementation - substrate), and ΔE2 (cementation - trial). The data were analyzed using the Kolmogorov-Smirnov test, the Wilcoxon test, or t-test for paired samples and repeated-measures ANOVA, post hoc Bonferroni, or the Friedman test (p < 0.05). RESULTS: The results indicated no statistically significant difference between the groups comparing ΔE0 and ΔE1 for 0.35 mm thickness laminate veneers, except for groups 2a and 5a. For 0.70 mm thickness laminate veneers, no statistically significant differences were observed between the groups comparing ΔE0 and ΔE1. ΔE2 values for 0.35 mm and 0.70 mm thickness laminate veneers ranged from 1.77 ± 0.81 to 4.99 ± 3.80 and from 1.01 ± 0.73 to 4.66 ± 2.96, respectively. CONCLUSIONS: Try-in pastes correspond with their respective resin cements for most colors investigated. The color of the resin cement may influence the final color of laminate veneers. Thickness of the ceramic was the most relevant variable for color change.


Assuntos
Cimentos Dentários/uso terapêutico , Facetas Dentárias , Pigmentação em Prótese , Cimentos de Resina/uso terapêutico , Animais , Bovinos , Cor , Cimentos Dentários/efeitos adversos , Cimentos de Resina/efeitos adversos
12.
Am J Orthod Dentofacial Orthop ; 155(1): 88-97, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30591172

RESUMO

INTRODUCTION: The aim of this study was to determine the effect of an orthodontic bonding adhesive containing benzalkonium chloride (BAC) on enamel demineralization. METHODS: Eighteen female Sprague-Dawley rats, aged 8 to 10 weeks, were inoculated with Streptococcus sobrinus for 5 days. The animals were randomly divided into the control, non-BAC, and BAC groups. The 6 animals in each group did not receive any brackets, received brackets on the maxillary left first molars bonded with conventional adhesive, or received brackets on the maxillary left and right first molars bonded with adhesive incorporated with 0.25% and 0.75% BAC (wt/wt), respectively. After 7 weeks, the maxillae were soaked in murexide stain to observe the surface area (mm2) and percentages of enamel demineralization on the palatal, mesial, buccal, and occlusal surfaces of the maxillary molars using color-based image analysis. RESULTS: The non-BAC and BAC groups exhibited greater enamel demineralization compared with the control group. The surface areas and percentages of enamel demineralization in the BAC group were less compared with the non-BAC group. Less enamel demineralization was noted in the animals treated with 0.75% BAC compared with those given 0.25% BAC in all areas; however, these differences were not great enough to attain statistical significance at the 0.05 level. CONCLUSIONS: The addition of BAC to an orthodontic composite has the potential to reduce the amount and percentage of enamel demineralization. In addition to being an antibacterial agent, BAC may also have an anticariogenic effect. Increased sample sizes and testing of more concentrations of BAC are recommended.


Assuntos
Anti-Infecciosos Locais/uso terapêutico , Compostos de Benzalcônio/uso terapêutico , Cimentos Dentários/uso terapêutico , Desmineralização do Dente/prevenção & controle , Animais , Anti-Infecciosos Locais/farmacologia , Compostos de Benzalcônio/farmacologia , Cárie Dentária/prevenção & controle , Cimentos Dentários/farmacologia , Feminino , Humanos , Ratos , Ratos Sprague-Dawley , Dente/efeitos dos fármacos
13.
J Prosthodont ; 28(1): e332-e336, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29578300

RESUMO

PURPOSE: The apical seal provided by a root canal filling may be breached via coronal leakage. This study aimed to compare the teeth restored with custom-made cast metal posts and cores cemented with different luting agents in terms of coronal microleakage after thermocycling. MATERIALS AND METHODS: This in vitro study was conducted on 32 extracted single-canal teeth. Root canals were prepared by step-back technique and filled with gutta percha and sealer. The coronal 7 mm of gutta percha was removed, and post space was prepared using peeso reamers #2 and #3 consecutively. After fabricating the acrylic resin patterns of the posts and cores, they were cast using Ni-Cr metal alloy. The specimens were divided into 4 groups in which the castings were cemented using one of the following luting agents: zinc phosphate (ZP), glass ionomer (GI), Panavia F 2.0, and Speed CEM. After cementation, the teeth were immersed in distilled water and incubated for 7 days. Then, the teeth were subjected to thermocycling, immersed in silver nitrate for 6 hours, and finally sectioned. The degree of dye penetration into the coronal part of the specimens was measured using a stereomicroscope. Data were analyzed using Kruskal-Wallis and Mann-Whitey U tests with significance level of 0.05. RESULTS: The median microleakage in ZP, Speed CEM, GI, and Panavia were 171.89, 114.76, 26.51, and 20.02 µm, respectively. Pairwise comparisons among GI and ZP, GI, and Speed CEM, ZP and Panavia, ZP and Speed CEM, and Panavia and Speed CEM groups yielded significant differences (p < 0.05). CONCLUSION: Complete coronal seal was not achieved with any of the luting agents. The highest and the lowest degree of microleakage was yielded by ZP and Panavia luting agents, respectively.


Assuntos
Cimentos Dentários/uso terapêutico , Infiltração Dentária/etiologia , Restauração Dentária Permanente/métodos , Técnica para Retentor Intrarradicular/efeitos adversos , Restauração Dentária Permanente/efeitos adversos , Humanos , Técnicas In Vitro , Obturação do Canal Radicular/efeitos adversos , Obturação do Canal Radicular/métodos
14.
J Prosthodont ; 28(1): e342-e349, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29654646

RESUMO

PURPOSE: To investigate the effect of various surface pretreatments and adhesive systems on bond strength of resin cement to polyetheretherketone (PEEK). MATERIALS AND METHODS: 360 PEEK specimens were divided into 4 groups to receive the following pretreatments (n = 90): no pretreatment, sandblasting, silica coating and Er:YAG laser. Surface roughness (SR) and scanning electron microscopy (SEM) evaluations were conducted after mechanical pretreatments for topographical surface evaluations. After the pretreatments, each group was divided into 3 subgroups (n = 30) according to the adhesive system used: no adhesive system, Visio.link, and Signum PEEK Bond. Resin cement was applied, and specimens underwent 5000 thermocycles (5-55°C) before shear bond strength (SBS) test. One-way ANOVA and Tukey test were used to analyze the SR data; 2-way ANOVA and Fisher's LSD test were used to analyze the SBS data at the confidence interval of 95% (α = 0.05). RESULTS: The sandblasting group demonstrated the highest SR values (p < 0.05). No significant differences in SR values were identified among silica coating, laser, and control groups (p ˃ 0.05). Conditioning with Visio.link after sandblasting group exhibited the highest SBS values (p < 0.05). No significant differences in SBS values were found between laser and control group (p ˃ 0.05). Conditioned groups presented higher SBS values than unconditioned groups (p < 0.05). Between the two adhesive systems, Visio.link demonstrated statistically significant higher SBS values than Signum PEEK Bond (p < 0.05). CONCLUSION: Silica coating and sandblasting were shown to provide superior pretreatment of PEEK surface. Laser pretreatments showed no effectiveness on bond strength of resin cement to PEEK. Adhesive systems improved the resin bonding to PEEK.


Assuntos
Colagem Dentária , Cimentos Dentários/uso terapêutico , Materiais Dentários/uso terapêutico , Cetonas/uso terapêutico , Polietilenoglicóis/uso terapêutico , Cimentos de Resina/uso terapêutico , Colagem Dentária/métodos , Polimento Dentário , Análise do Estresse Dentário , Técnicas In Vitro , Lasers de Estado Sólido , Microscopia Eletrônica de Varredura , Resistência ao Cisalhamento , Propriedades de Superfície
15.
J Prosthodont ; 28(2): e705-e712, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29522263

RESUMO

PURPOSE: To evaluate the biocompatibility of five dental cement compositions after directly exposing human gingival fibroblast (HGF) and MC3T3-E1 preosteoblast cells to cement alone and cement applied on commercially pure titanium (cpTi) specimens. MATERIALS AND METHODS: Nanostructurally integrated bioceramic (NIB), resin (R), resin-modified glass ionomer (RMGIC), zinc oxide eugenol (ZOE), and zinc phosphate (ZP) compositions were prepared according to the respective manufacturer's instructions. Samples were prepared in cylindrical Teflon molds or applied over the entire surface of polished cpTi discs. All samples were cured for 0.5, 1, 12, or 24 hours post-mixing. Direct contact testing was conducted according to ISO 10993 by seeding 6-well plates at 350,000 cells/well. Plates were incubated at 37°C in a humidified atmosphere with 5% CO2 for 24 hours before individually plating samples and cpTi control discs. Plates were then incubated for an additional 24 hours. Microtetrazolium (MTT) cell viability assays were used to measure sample cytotoxicity. RESULTS: For samples that cured for 24 hours prior to direct contact exposure, only NIB and ZP cements when cemented on cpTi demonstrated cell viability percentages above the minimum biocompatibility requirement (≥70%) for both the investigative cell lines. R, RMGIC, and ZOE cements exhibited moderate to severe cytotoxic effects on both cell lines in direct contact and when cemented on cpTi specimens. For HGF cells, ZOE cemented-cpTi specimens exhibited significantly decreased cytotoxicity, whereas RMGIC cemented-cpTi specimens exhibited significantly increased cytotoxicity. CONCLUSIONS: Despite previous studies that showed enhanced cpTi corrosion activity for fluoride-containing compositions (NIB and ZP), there was no significant difference in cytotoxicity between cement alone and cemented-cpTi. In general, the MC3T3-E1 preosteoblast cells were more sensitive than HGF cells to cement composition. Ultimately, cement composition played a significant role in maintaining host cell compatibility. Results of this work help illustrate the impact of different cement formulations on host cell health and emphasize the need for understanding material properties when selecting certain formulations of dental cements, which can ultimately influence the survival of dental implant systems.


Assuntos
Materiais Biocompatíveis , Cimentos Dentários/uso terapêutico , Implantes Dentários , Titânio , Sobrevivência Celular/efeitos dos fármacos , Cerâmica/uso terapêutico , Retenção em Prótese Dentária/métodos , Fibroblastos , Gengiva/citologia , Cimentos de Ionômeros de Vidro/uso terapêutico , Humanos , Técnicas In Vitro , Teste de Materiais/métodos , Nanoestruturas/uso terapêutico , Cimento de Óxido de Zinco e Eugenol/uso terapêutico , Cimento de Fosfato de Zinco/uso terapêutico
16.
Acta Med Acad ; 48(3): 262-270, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32124624

RESUMO

OBJECTIVES: The purpose of this in vitro investigation was to evaluate qualitatively the surface topography at the bracket-adhesive-enamel junction, bonded to the buccal and lingual surfaces of premolars with composite resin and resin-modified glass-ionomer orthodontic adhesives, using two methods of adhesive removal: a dental explorer and a micro brush. METHODS: Forty premolar surfaces were allocated to four groups of 10/ each, 20/buccal and 20/lingual surfaces. The brackets were bonded to the surface of the enamel and any extra adhesive was removed with a dental explorer or a micro brush. Specimens were evaluated and scored by two calibrated independent raters, at the bracketadhesive-enamel junction, for adhesive overlap on the bracket, the smoothness of the surface, as well as the presence of projections and depressions, using a digital microscope. The Fisher-exact statistical test was conducted to compare the different groups. RESULTS: Regardless of the method used to remove the adhe sives, all groups showed partial or complete overlap of the adhesive on the bracket. No statistical difference was found between the groups for adhesive overlap (P=1.0). However, resin-modified glass-ionomer was found to be statistically significantly (P<0.05) better than composite resin in both smoothness and the lack of projections or depressions, regardless of the instrument of removal. CONCLUSION: Removing excess adhesive with a dental explorer or a micro brush is not an ideal method for adhesive removal, as partial or complete overlap of the adhesive on the bracket existed in all groups. On the other hand, resin-modified glassionomer was a superior material to composite resin for better smoothness and surface topography at the bracket-adhesive-enamel junction.


Assuntos
Cimentos Dentários/uso terapêutico , Esmalte Dentário , Braquetes Ortodônticos , Resinas Compostas/uso terapêutico , Colagem Dentária/métodos , Humanos , Técnicas In Vitro
17.
Biomed Res Int ; 2018: 1498901, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30426003

RESUMO

The reinforcement of resins with short or long fibers has multiple applications in various engineering and biomedical fields. The use of fiber reinforced composites (FRCs) in dentistry has been described in the literature from more than 40 years. In vitro studies evaluated mechanical properties such as flexural strength, fatigue resistance, fracture strength, layer thickness, bacterial adhesion, bonding characteristics with long fibers, woven fibers, and FRC posts. Also, multiple clinical applications such as replacement of missing teeth by resin-bonded adhesive fixed dental prostheses of various kinds, reinforcement elements of dentures or pontics, and direct construction of posts and cores have been investigated. In orthodontics, FRCs have been used also for active and passive orthodontic applications, such as anchorage units, en-masse movement units, and postorthodontic tooth retention. FRCs have been extensively tested in the literature, but today the advances in new technologies involving the introduction of nanofillers or new fibers along with understanding the design principles of FRC devices open new fields of research for these materials both in vitro and in vivo. The present review describes past and present applications of FRCs and introduces some future perspectives on the use of these materials.


Assuntos
Resinas Compostas , Cimentos Dentários , Prótese Dentária , Nanofibras , Técnicas de Movimentação Dentária/métodos , Resinas Compostas/química , Resinas Compostas/uso terapêutico , Cimentos Dentários/química , Cimentos Dentários/uso terapêutico , Humanos , Nanofibras/química , Nanofibras/uso terapêutico
18.
J Prosthet Dent ; 120(4): 631.e1-631.e6, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30314611

RESUMO

STATEMENT OF PROBLEM: The color stability and mechanical properties of luting agents influence the esthetics and longevity of ceramic restorations. However, studies evaluating the color changes and mechanical properties of luting agents under ceramic laminates activated by using different methods are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different modes of photoactivation on the nanohardness and elastic modulus of resin cements and dental adhesives and on the color stability of ceramic laminate veneers. MATERIAL AND METHODS: Forty-four lithium disilicate blocks (7×8×0.6 mm) were cemented onto bovine enamel and divided into 4 groups according to the polymerization light (Radii-Cal or Valo) used and the mode of activation of the dental adhesive (no previous photoactivation or previous photoactivation). Single Bond Universal dental adhesive and RelyX Veneer resin cement were used in all experimental groups. Color stability was measured using a UV-2450 ultraviolet-visible spectrophotometer before and after ultraviolet-B artificial accelerated aging (n=8). The nanohardness and the elastic modulus of the adhesive and resin cement were measured using a nanohardness tester (n=3). The color stability and mechanical properties were measured and analyzed using ANOVA and the Tukey least significant difference test (α=.05). RESULTS: No difference in color stability or mechanical properties of the resin cement among the polymerization lights was detected (P>.05). Specimens that underwent previous photoactivation of the adhesive using the Valo polywave unit exhibited higher elastic modulus values than those that did not undergo previous photoactivation (P<.001). CONCLUSIONS: The Valo polywave polymerization light improved mechanical properties and color stability more than the Radii-Cal unit. Previous activation of the dental adhesive in the dental enamel with the Valo polywave polymerization light yielded more satisfactory results.


Assuntos
Cerâmica/uso terapêutico , Planejamento de Prótese Dentária , Restauração Dentária Permanente , Facetas Dentárias , Pigmentação em Prótese , Animais , Bovinos , Cor , Cimentos Dentários/uso terapêutico , Restauração Dentária Permanente/métodos , Elasticidade , Dureza , Técnicas In Vitro , Cura Luminosa de Adesivos Dentários , Cimentos de Resina/uso terapêutico
19.
Eur J Oral Sci ; 126 Suppl 1: 95-101, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30178556

RESUMO

In dentistry, isotropic materials, such as metals, ceramics, and polymers, are used. Their properties are not related to any specific direction of the material microstructure. There is a trend toward non-metallic, adhesive, and minimally invasive dentistry. This is in line with the conceptual change seen in the automobile industry, in which the basis of car structures has changed from body-on-frame designs to unibody designs. In unibody designs, all structural parts of the body of the car mechanically form a single structural entity. In modern adhesive dentistry, remaining tooth substance and the dental material form unibody designs, enabling preservation of tooth substance. Biological structures are created to withstand loading and are light in weight. The structural designs of elements in these biological materials are, to a large extent, based on fibrous material. More attention has been paid to mimicking fibrous structures of dental hard tissues by synthetic fiber-reinforced composites. This overview reports key features of natural fibrous elements and how they are utilized in dentistry. Special emphasis is placed on the aspects of interfacial adhesion of restorative materials, especially ceramics to resin-based materials and their role in the unibody design of the tooth-restoration system.


Assuntos
Materiais Biomiméticos/uso terapêutico , Planejamento de Prótese Dentária , Prótese Dentária , Cerâmica/uso terapêutico , Resinas Compostas/uso terapêutico , Cimentos Dentários/uso terapêutico , Materiais Dentários/uso terapêutico , Planejamento de Prótese Dentária/métodos , Restauração Dentária Permanente/métodos , Humanos
20.
Clin Oral Implants Res ; 29(10): 996-1006, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30238517

RESUMO

OBJECTIVES: To assess the early histological, microbiological, radiological, and clinical response to cemented and screw-retained all-ceramic single-tooth implant-supported reconstructions. MATERIALS AND METHODS: Patients with single-tooth implants were randomly allocated to receive a cemented lithium disilicate crown on a customized zirconia abutment (CEM) or a screw-retained crown with a directly veneered zirconia abutment (SCREW). At the screening visit, at crown insertion and at the 6-month follow-up, clinical parameters were measured at the implant and the contralateral tooth. Marginal bone levels, technical parameters, and esthetic outcomes were measured at the implants. At the 6-month follow-up, a microbiological test was performed and a soft tissue biopsy was harvested at the implants for histological analysis. Inflammatory cells and fibroblasts/-cytes were analyzed at the level of the sulcular epithelium, junctional epithelium, and connective tissue. The histological parameters were analyzed by means of a linear mixed model. RESULTS: Thirty-three patients completed the study, and implant and crown survival rates were 100% at 6 months. Histologically, the number of inflammatory cells tended to be higher in group CEM (p > 0.05). Moreover, significantly less inflammatory cells and fibroblasts/-cytes were found in the sulcular epithelium compared to the junctional epithelium and supracrestal connective tissue (p < 0.001). Four patients were tested positive for periodontal marker pathogens at the 6-month follow-up, and three of them belonged to group CEM. From crown insertion to the 6-month follow-up, median marginal bone levels changed only minimally and measured 0.31 and 0.32 mm in group CEM and 0.47 and 0.36 mm in group SCREW, respectively. Clinical and esthetic parameters remained stable over time and were comparable between natural teeth and implants as well as between the groups. CONCLUSIONS: Cemented reconstructions were associated with more inflammatory cells, and more patients were diagnosed with periodonto-pathogens. Both types of reconstructions resulted in similar radiological (marginal bone levels) and clinical outcomes (bleeding on probing and probing depth).


Assuntos
Parafusos Ósseos , Cerâmica/uso terapêutico , Coroas , Cimentos Dentários/uso terapêutico , Prótese Dentária Fixada por Implante , Periodonto/patologia , Perda do Osso Alveolar/diagnóstico por imagem , Perda do Osso Alveolar/microbiologia , Perda do Osso Alveolar/patologia , Dente Suporte , Projeto do Implante Dentário-Pivô , Implantes Dentários para Um Único Dente , Prótese Dentária Fixada por Implante/métodos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Periodonto/diagnóstico por imagem , Periodonto/microbiologia , Radiografia Dentária , Zircônio/uso terapêutico
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