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1.
Acta Odontol Latinoam ; 34(1): 10-17, 2021 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-34137773

RESUMO

Dentin hypersensitivity is caused by increased dentinal permeability due to total or partial exposure of dentinal tubules, which in turn can be produced by alterations of dental structures or failure of restorative procedures. The purpose of this in vitro study was to evaluate the efficacy of the application of different kinds of adhesive systems to prevent dentin permeability before and after an erosive challenge. Fifty bovine dentin discs (6x1 mm) were prepared and the specimens were divided into 5 groups (n=10): (SB2) Single Bond 2, (SBU) Universal Single Bond, (CSB) Clearfil SE Bond, (SM) Scotchbond Multipurpose and (C) Control. Hydraulic conductance of dentin was recorded after adhesive application (HC-1) and after erosive challenge (HC-2). Dentin surface images of post-treatment and post-erosive challenge were obtained by scanning electron microscopy (SEM). Data were analyzed using Kruskal Wallis, Mann-Whitney with Bonferroni correction and Wilcoxon tests (p<0.05). Reduction in dentin permeability was observed with the application of adhesive systems (p<0.05). After the erosive challenge, dentin permeability increased for SBU and CSB (p<0.05), while SB2 and SM did not differ in HC-1 or HC-2 (p>0.05). The conventional, self-etching and universal adhesive systems reduce dentinal permeability by more than 80%, and dentin demineralization may contribute to the increased permeability of universal and self-etching systems.


Assuntos
Colagem Dentária , Adesivos Dentinários , Animais , Bovinos , Resinas Compostas , Cimentos Dentários , Dentina , Teste de Materiais , Permeabilidade , Cimentos de Resina , Resistência à Tração
2.
Acta odontol. latinoam ; 34(1): 10-17, Apr. 2021. graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1284929

RESUMO

ABSTRACT Dentin hypersensitivity is caused by increased dentinal permeability due to total or partial exposure of dentinal tubules, which in turn can be produced by alterations of dental structures or failure of restorative procedures. The purpose of this in vitro study was to evaluate the efficacy of the application of different kinds of adhesive systems to prevent dentin permeability before and after an erosive challenge. Fifty bovine dentin discs (6x1 mm) were prepared and the specimens were divided into 5 groups (n=10): (SB2) Single Bond 2, (SBU) Universal Single Bond, (CSB) Clearfil SE Bond, (SM) Scotchbond Multipurpose and (C) Control. Hydraulic conductance of dentin was recorded after adhesive application (HC-1) and after erosive challenge (HC-2). Dentin surface images of post-treatment and post-erosive challenge were obtained by scanning electron microscopy (SEM). Data were analyzed using Kruskal Wallis, Mann-Whitney with Bonferroni correction and Wilcoxon tests (p<0.05). Reduction in dentin permeability was observed with the application of adhesive systems (p<0.05). After the erosive challenge, dentin permeability increased for SBU and CSB (p<0.05), while SB2 and SM did not differ in HC-1 or HC-2 (p>0.05). The conventional, self-etching and universal adhesive systems reduce dentinal permeability by more than 80%, and dentin demineralization may contribute to the increased permeability of universal and self-etching systems.


RESUMO Diversos pacientes apresentam hipersensibilidade dentaria ou falha nos procedimentos restauradores, devido á exposigao total ou parcial de túbulos dentinários. O objetivo deste estudo in vitro foi o de avaliar a influencia da aplicagao de diferentes tipos de sistemas adesivos na permeabilidade da dentina e após o desafio erosivo. Cinquenta discos de dentina bovina (6x1 mm) foram confeccionados e os espécimes foram divididos em 5 grupos (n = 10): (SB2) Single Bond 2, (SBU) Universal Single Bond, (CSB) Clearfil SE Bond, (SM) ScotchbondMultiuso e (C) Controle. A condutáncia hidráulica da dentina foi registrada após a aplicagao do adesivo (HC-1) e após o desafio erosivo (HC-2). Imagens da superficie da dentina de pós-tratamento e pós-desafio erosivo foram obtidas por microscopia eletronica de varredura (MEV). Os dados foram analisados pelos testes de Kruskal Wallis, Mann-Whitney com correçâo de Bonferroni e Wilcoxon (p <0,05). Reduçâo da permeabilidade dentinária foi observada com a aplicaçâo dos sistemas adesivos (p <0,05). Após o desafio erosivo, a permeabilidade dentinária aumentou para SBU e CSB (p <0,05), enquanto SB2 e SM nao diferiram em HC-1 e HC-2 (p> 0,05). Os sistemas adesivos convencionais, autocondicionantes e universais reduzem a permeabilidade dentinária em mais de 80%, e a dentina desmineralizada pode gerar um aumento da permeabilidade dos sistemas adesivos universais e autocondicionantes.

3.
J Contemp Dent Pract ; 19(3): 278-282, 2018 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-29603698

RESUMO

AIM: This study aims to evaluate the effect of erbium: Yttrium-aluminum-garnet (Er:YAG) laser irradiation on the enamel microshear bond strength (µSBS), followed by the utilization of etch-and-rinse and universal adhesive systems. MATERIALS AND METHODS: A total of 32 molars were sectioned in the mesiodistal direction producing 64 samples that were randomized into two groups (n = 32): single bond 2 (SB2) (etch-and-rinse system; 3M), SB universal (SBU) (universal etching system; The SB2 and SBU groups were then divided into two subgroups (n = 16): (i) enamel was irradiated with an Er:YAG laser (λ = 2.94 µm, 60 mJ, 10 Hz), and (ii) enamel served as a control. The samples were restored with TPH3 (Dentsply), stored in artificial saliva for 24 hours, and subjected to a micro-shear test. RESULTS: Kruskal-Wallis (p < 0.05) and Mann-Whitney U tests indicated no significant differences in uSBS between the groups, and the fractures were predominately at the resin-enamel interface. CONCLUSION: The previous irradiation of enamel with Er:YAG laser does not interfere with the performance of simplified two-step etch-and-rinse and universal adhesive systems. CLINICAL SIGNIFICANCE: The increasing use of Er:YAG laser is important to evaluate the influence of this irradiation on the adhesion of restorative materials. Thus, to obtain the longevity of the restorative procedures, it is necessary to know the result of the association of the present adhesive systems to the irradiated substrate.


Assuntos
Cimentos Dentários/uso terapêutico , Esmalte Dentário/cirurgia , Lasers de Estado Sólido/uso terapêutico , Alumínio , Colagem Dentária/métodos , Corrosão Dentária/métodos , Humanos , Melhoria de Qualidade , Ítrio
4.
J Contemp Dent Pract ; 17(10): 820-825, 2016 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-27794152

RESUMO

INTRODUCTION: The adhesive systems and the techniques currently used are designed to provide a more effective adhesion with reduction of the protocol application. The objective of this study was to evaluate the bond strength of universal adhesive systems on enamel in different etching modes (self-etch and total etch). MATERIALS AND METHODS: The mesial and distal halves of 52 bovine incisors, healthy, freshly extracted, were used and divided into seven experimental groups (n = 13). The enamel was treated in accordance with the following experimental conditions: FUE-Universal System - Futurabond U (VOCO) with etching; FUWE - Futurabond U (VOCO) without etching; SB-Total Etch System - Single Bond 2 (3M); SBUE-Universal System - Single Bond Universal (3M ESPE) with etching; SBUWE - Single Bond Universal (3M ESPE) without etching; CLE-Self-etch System - Clearfil SE Bond (Kuraray) was applied with etching; CLWE - Clearfil SE Bond (Kuraray) without etching. The specimens were made using the composite spectrum TPH (Dentsply) and stored in distilled water (37 ± 1°C) for 1 month. The microshear test was performed using the universal testing machine EMIC DL 2000 with the crosshead speed of 0.5 mm/minute. The bond strength values were analyzed using statistical tests (Kruskal-Wallis test and Mann-Whitney test) with Bonferroni correction. RESULTS: There was no statistically significant difference between groups (p < 0.05), where FUE (36.83 ± 4.9 MPa) showed the highest bond strength values and SBUWE (18.40 ± 2.2 MPa) showed the lowest bond strength values. The analysis of adhesive interface revealed that most failures occurred between the interface composite resin and adhesive. CONCLUSION: The universal adhesive system used in dental enamel varies according to the trademark, and the previous enamel etching for universal systems and the self-etch both induced greater bond strength values. CLINICAL SIGNIFICANCE: Selective enamel etching prior to the application of a universal adhesive system is a relevant strategy for better performance bonding.


Assuntos
Condicionamento Ácido do Dente/métodos , Adesivos/química , Colagem Dentária , Cimentos de Resina , Resistência ao Cisalhamento , Animais , Bovinos , Análise do Estresse Dentário , Teste de Materiais
5.
Acta Odontol Latinoam ; 24(2): 141-9, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22165311

RESUMO

The aim of this study is to assess through microhardness test, sorption test and morphological analysis, the behavior of composite resin submitted to the influence of pH cycling model and/or topic application of fluoride gels. Samples of microhybrid Z100 (3M), Estelite sigma (J Morita) and nanoparticulated Filtek Supreme (3M) composite resins were made. The Digital Scale and Vickers Digital Microhardmeter were employed to verify the water sorption and superficial microhardness, respectively. Samples were submitted to acid challenge and topical fluoride gel application. Other samples were made for the morphological analysis. The resin surface morphology in each phase of this experimental study was observed using scanning electron microscopy (SEM). The ANOVA two-way, ANOVA split plot and Tukey statistical tests were used for the statistical analysis. It was concluded that the type of composite resin can influence the water sorption, microhardness and the degree of morphologic alteration, when submitted to different experimental conditions.


Assuntos
Resinas Compostas , Fluoretos/administração & dosagem , Dureza , Teste de Materiais , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Água
7.
Acta Odontol Latinoam ; 22(2): 75-80, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19839481

RESUMO

The aim of this study is to evaluate the flexural resistance of three types of restorative materials: compomer (Freedom), resin-modified glass-ionomer (Vitremer) and composite resin (Esthet-X), observing whether the application of bleaching agent can cause alterations of their flexural properties. Sixty samples were made using a 10 x 1 x 1 mm brass mold, and divided into three groups: G1- Freedom (SDI); G2- Vitremer (3M ESPE); G3- Esthet-X (Dentsply). On half of the samples of each group (10 samples) the bleaching treatment was applied and the other half used as control, was stored in distilled water at a temperature of 37 degrees C. Whiteness HP Maxx bleaching system was applied on the sample surface following the manufacturer's recommendations, simulating the bleaching treatment at the clinic. After this period, a flexural strength (three-point bending) test was conducted using (EMIC DL 1000) machine until the samples fractured. The data were submitted to ANOVA and Tukey tests. Of the restorative materials studied, G3-(87.24 +/- 31.40 MPa) presented the highest flexural strength, followed by G1-(61.67 +/- 21.32 MPa) and G2-(61.67 +/- 21.32 MPa). There was a statistical difference in flexural strength after the bleaching treatment. It was concluded that the use of a beaching agent can promote significant alteration of the flexural strength of these restorative materials.


Assuntos
Compômeros , Resinas Compostas , Colagem Dentária , Restauração Dentária Permanente , Cimentos de Ionômeros de Vidro , Clareamento Dental , Teste de Materiais
8.
Acta odontol. latinoam ; 22(2): 75-80, Sept. 2009. graf, tab
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-973536

RESUMO

The aim of this study is to evaluate the flexural resistance of three types of restorative materials: compomer (Freedom), resin-modified glass-ionomer (Vitremer) and composite resin (Esthet-X), observing whether the application of bleaching agent can cause alterations of their flexural properties. Sixty samples were made using a 10x1x1 mm brass mold, and divided into three groups: G1- Freedom (SDI); G2- Vitremer (3M ESPE); G3- Esthet-X (Dentsply). On half of the samples of each group (10 samples) the bleaching treatment was applied and the other half, used as control, was stored in distilled water at a temperature of 37oC. Whiteness HP Maxx bleaching system was applied on the sample surface following the manufacturer's recommendations, simulating the bleaching treatment at the clinic. After this period, a flexural strength (three-point bending) test was conducted using (EMIC DL 1000) machine until the samples fractured. The data were submitted to ANOVA and Tukey tests. Of the restorative materials studied, G3- (87.24±31.40MPa) presented the highest flexural strength, followed by G1-(61.67±21.32MPa) and G2-(61.67±21.32MPa). There was a statistical difference in flexural strength after the bleaching treatment. It was concluded that the use of a beaching agent can promote significant alteration of the flexural strength of these restorative materials.


O objetivo deste trabalho foi o de avaliar a resistencia flexural de tres tipos de materiais restauradores hibridos; compomero (Freedom), cimento de ionomero de vidro modificado por resina (CIV-RM) (Vitremer) e resina composta (Esthet-X) verificando se a aplicacao do agente clareador promove alteracoes em suas propriedades flexurais. Foram confeccionadas 60 amostras, com auxilio de uma matriz metalica 10x1x1mm, as quais foram divididas em tres grupos: G1- Freedom (SDI); G2- Vitremer (3M ESPE); G3- Esthet-X (Dentsply). Em metade das amostras de cada grupo, ou seja, 10 amostras, foi realizado o tratamento clareador permanecendo as demais armazenadas em agua destilada 37°C. Utilizou-se o sistema de clareamento Whiteness HP Maxx sobre a superficie das amostras seguindo as orientacoes do fabricante, simulando assim, o tratamento clareador realizado em consultorio. Decorrido este periodo, foi realizado o ensaio mecanico de resistencia a flexao de 3 pontos na maquina de testes universal (EMIC DL 1000) ate a fratura dos especimes. Os dados foram submetidos aos testes ANOVA-2 fatores e Tukey. Observou-se diferenca estatisticamente significante entre os materiais, sendo que G3-(87,24±31,40MPa) apresentou a maior resistencia flexural seguida pelo G1-(61,67±21,32MPa) e G2- (21,04±8,94MPa), e apos a realizacao do tratamento clareador. Concluiu-se que ha diferenca estatisticamente significante entre a resistencia flexural da resina composta, compomero e o CIVRM, sendo a aplicacao do agente clareador capaz de promover alteracoes na resistencia flexural destes materiais.

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