Influence of cavo superficial enamel acid-etching on the microtensile bond strength of low-shrinkage composite resin

• Autor(a) principal: BORGHI,Raquel Devisate
• Data de Publicação: 2020
• Outros Autores: COPPINI,Erick Kamiya, PIEROTE,Josué Junior Araújo, CÂMARA,João Victor Frazão, PAULILLO,Luis Alexandre Maffei Sartini
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista de Odontologia da UNESP
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1807-25772020000100410
• topic: Composite resins; dental cavity preparation; hardness

Abstract Introduction To prevent the shrinkage stresses produced during polymerization, composite resins of low polymerization shrinkage were developed. Objective To evaluate the microtensile bond strength in class I cavities restored by acid-etching the cavosurface angle and with composite resins indicated for posterior teeth. Material and method 48 healthy molars were selected and divided into six groups (n = 8), considering that the cavosurface enamel of three groups was etched with 35% phosphoric acid. The teeth were restored with the Clearfil SE Bond adhesive system and Filtek Z350 XT, Empress Direct, and Charisma Diamond composite resins, which were light-cured for 40 seconds. After 24 hours, the teeth were taken to a cutting machine, which produced sections in the buccolingual and mesiodistal directions. This resulted in toothpicks of 0.9×0.9 mm that were taken to the universal testing machine for the microtensile bond strength test. Statistical analysis was performed with ANOVA and Tukey’s test (p < 0.05). Result There was no statistically significant difference between the groups evaluated. Conclusion Acid-etching the cavosurface angle did not affect the performance of restorations, probably due to the adhesive system used.