Effect of sonic application on the performance of an adhesive system applied on dry/wet dentin

• Grant number: 14/04347-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2014
• End date: April 30, 2015
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Lucas Silveira Machado
• Grantee: Caio César Pavani
• Host Institution: Faculdade de Odontologia (FOA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil

Abstract

The objective of this study is to evaluate the effect of ultrasonic application of an adhesive system in dry and wet etched dentin, immediately and 6-month after restorative procedures. The occlusal enamel of 40 human molars will be removed to expose a flat of dentine surface, which will be randomized into 4 groups. The conventional Adper Scotchbond Multipurpose Plus (3M) adhesive system will be applied under manual mode or sonic vibration, in dentin conditioned by phosphoric acid, in dry or wet conditions. The response variables will be the resin-dentin bond strength (¼TBS) and the Nano leakage in the hybrid and adhesive layers, analyzed immediately and after 6 months of restorative procedures. According to the factors in study, the groups will be formed: - GI - Scotch bond applied on moist dentin with manual application; GII - Scotch bond applied on dry dentin with manual application; GIII - Scotch bond applied on moist dentin with ultrasonic application and GIV - Scotch bond applied on dry dentin with ultrasonic application. Composite build-up swill be constructed incrementally; specimens will be sectioned to obtain resin-dentin sticks with cross-sectional area of 1 mm² and tested as bond strength immediately or after 6 months of water storage. Two bonded sticks, from each tooth at each storage time, will be immersed in a silver nitrate solution, photo-developed, and analyzed under scanning electron microscopy. The amount of Nano leakage will be measured using the Image J software. The results will be subjected to appropriate statistical analysis, the level of 5 %.