Resistência de união e microinfiltração em restaurações de resina

• Autor(a) principal: Lima, Luciana Monti
• Data de Publicação: 2011
• Outros Autores: Motisuki, Cristiane, Lopes, Beatriz Maria Valério, Santos-Pinto, Lourdes Aparecida Martins dos [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://revodontolunesp.com.br/article/51ae4aa81ef1faca3d00384e; http://hdl.handle.net/11449/125444
• topic: Ultrasonics; Diamond; Dental cavity preparation; Tensile strength; Dental leakage; Dentin; CVD (chemical vapor deposition); Ultra-som; Preparo de cavidade dentária; Microinfiltração

This in vitro study evaluated microtensile bond strength (MBS) and microleakage of composite resin restorations in cavities prepared with ultrasonic diamond tip and diamond bur coupled to high-speed handpiece. The MBS test used 6 third molars that after enamel occlusal removal were randomly divided in two groups according to the 2 cutting instruments that were applied on dentin surface during 60 seconds. Blocks of 3 mm composite resin were made over the dentin surface treated and after 24  hours each tooth produced sticks with a cross-sectional area of 0.81 mm2 that were submitted to a microtensile test for bond strength measure. To the microleakage test, standardized class V cavities with enamel and dentin margins were prepared on the facial and lingual surfaces of 12 third molars randomly divided in two groups according cutting instruments. After composite resin restoration, the teeth were subjected to thermocycle, immersed in 50% silver nitrate solution and sectioned to evaluate the percentage of microleakage under stereomicroscope. All data were analyzed by ANOVA and Tukey test (p ≤ 0.05). The results showed that the composite resin restorations made on dentin surface treated by ultrasonic diamond tip presented bond strength values significantly higher (p = 0.03). Microleakage in enamel and dentin margins was not different between groups. The ultrasonic diamond tip seems to be a promising alternative cutting instrument for restorative dental treatment.