Análise in vitro da resistência de união ao cisalhamento de uma resina composta à dentina humana e à bovina, tratadas com diferentes adesivos
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Data
2006
Autores
Magnani, Cristina [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho teve por objetivo avaliar, comparativamente, in vitro, a resistência de união ao cisalhamento de uma resina composta à dentina humana e à dentina bovina, submetidas ao tratamento com dois sistemas adesivos convencionais simplificados (Prime Bond NT®, Dentsply e Single Bond®/3M) e dois sistemas adesivos autocondicionantes (AdheSE®/Ivoclar-Vivadent e Adpper Prompt-L-Pop®/ 3M). Para a confecção dos corpos-de-prova, foram utilizadas as superfícies vestibulares de 40 dentes molares humanos e de 40 dentes incisivos bovinos, as quais foram divididas aleatoriamente em 8 grupos de 10 amostras cada, de acordo com o tipo de substrato e o sistema adesivo utilizado: Grupo 1 - dentina humana tratada com o sistema adesivo Single Bond; Grupo 2 - dentina humana tratada com o sistema adesivo Prime Bond NT; Grupo 3 - dentina humana tratada com o sistema adesivo AdheSE; Grupo 4 - dentina humana tratada com o sistema adesivo Adpper Prompt-L-Pop; Grupo 5 - dentina bovina tratada com o sistema adesivo Single Bond; Grupo 6 - dentina bovina tratada com o sistema adesivo Prime Bond NT; Grupo 7 - dentina bovina tratada com o sistema adesivo AdheSE; Grupo 8 - dentina bovina tratada com o sistema adesivo Adpper Prompt-L-Pop. Após o tratamento das superfícies, com o auxílio de uma matriz bipartida, foram confeccionados cilindros de resina composta Tetric Ceram apresentando 3mm de diâmetro e 4mm de altura. Os corpos-de-prova foram então armazenados em água destilada a 37ºC por 24 horas e submetidos a termociclagem (550 ciclos à temperatura de 10ºC e 55ºC). Após 48 horas de armazenamento em água destilada a 37ºC, foram levados a uma Máquina de Teste Universal para a realização do teste de cisalhamento utilizando-se uma ponta em forma de cinzel e velocidade do atuador de 0,5 mm/min. Os tipos de fratura foram analisados em lupa estereoscópica com 40X de aumento.
The purpose of this in vitro study was to evaluate, comparatively, the shear bond strength of a composite resin to human and bovine dentin treated with two conventional simplified adhesive systems (Prime Bond NT®/Dentsply and Single Bond®/3M) and two self-etching adhesive systems (AdheSE®/Ivoclar-Vivadent and Adpper Prompt-L-Pop®/3M). For preparation of specimens, the buccal surface of 40 human molars and 40 bovine incisors were obtained and randomly assigned to 8 groups (n=10), according to the type of substrate and adhesive system used. Group1 - human dentin treated with Single Bond; Group 2 - human dentin treated with Prime Bond NT; Group 3 - human dentin treated with AdheSE; Group 4 - human dentin treated with Adpper Prompt-L-Pop; Group 5 - bovine dentin treated with Single Bond; Group 6 - bovine dentin treated with Prime Bond NT; Group 7 - bovine dentin treated with AdheSE; Group 8 - bovine dentin treated with Adpper Prompt-L-Pop. After treatment with the adhesive systems, composite resin (Tetric Ceram) cylinders (3 mm in diameter and 4 mm high) were fabricated using a split matrix and were bonded to the dentin surfaces. The specimens were stored in distilled water at 37ºC for 24 hours and then submitted to a thermocycling regimen (550 cycles between 10ºC and 55ºC). After 48-hour storage in distilled water at 37ºC, the specimens were taken to a universal testing machine and loaded in shear strength until failure using knife-edge-shearing blade running at a crosshead speed of 0.5 mm/min. Failure mode was analyzed using a stereomicroscope at X40. Data were submitted to statistical analysis by analysis of variance at 5% significance level. The results showed that Single Bond and Prime Bond NT adhesive systems presented similar shear bond strength to each other (p>0.05) and significantly higher means than AdheSE and Adper Prompt-L-Pop (p<0.05), regardless of the type of substrate.
The purpose of this in vitro study was to evaluate, comparatively, the shear bond strength of a composite resin to human and bovine dentin treated with two conventional simplified adhesive systems (Prime Bond NT®/Dentsply and Single Bond®/3M) and two self-etching adhesive systems (AdheSE®/Ivoclar-Vivadent and Adpper Prompt-L-Pop®/3M). For preparation of specimens, the buccal surface of 40 human molars and 40 bovine incisors were obtained and randomly assigned to 8 groups (n=10), according to the type of substrate and adhesive system used. Group1 - human dentin treated with Single Bond; Group 2 - human dentin treated with Prime Bond NT; Group 3 - human dentin treated with AdheSE; Group 4 - human dentin treated with Adpper Prompt-L-Pop; Group 5 - bovine dentin treated with Single Bond; Group 6 - bovine dentin treated with Prime Bond NT; Group 7 - bovine dentin treated with AdheSE; Group 8 - bovine dentin treated with Adpper Prompt-L-Pop. After treatment with the adhesive systems, composite resin (Tetric Ceram) cylinders (3 mm in diameter and 4 mm high) were fabricated using a split matrix and were bonded to the dentin surfaces. The specimens were stored in distilled water at 37ºC for 24 hours and then submitted to a thermocycling regimen (550 cycles between 10ºC and 55ºC). After 48-hour storage in distilled water at 37ºC, the specimens were taken to a universal testing machine and loaded in shear strength until failure using knife-edge-shearing blade running at a crosshead speed of 0.5 mm/min. Failure mode was analyzed using a stereomicroscope at X40. Data were submitted to statistical analysis by analysis of variance at 5% significance level. The results showed that Single Bond and Prime Bond NT adhesive systems presented similar shear bond strength to each other (p>0.05) and significantly higher means than AdheSE and Adper Prompt-L-Pop (p<0.05), regardless of the type of substrate.
Descrição
Palavras-chave
Adesivos dentinários, Dentina, Resistência ao cisalhamento, Dentin, Dentin bonding agents, Shear atrength
Como citar
MAGNANI, Cristina. Análise in vitro da resistência de união ao cisalhamento de uma resina composta à dentina humana e à bovina, tratadas com diferentes adesivos. 2006. 151 p. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia, 2006.