Comparison of different adhesive techniques using an universal adhesive system

• Grant number: 15/09222-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2015
• End date: December 31, 2016
• Field of knowledge: Health Sciences - Dentistry - Dental Materials
• Principal Investigator: Letícia Cristina Cidreira Boaro
• Grantee: Fabrícia Viana Costa
• Host Institution: Universidade de Santo Amaro (UNISA). São Paulo , SP, Brazil

Abstract

In order to simplify the technique maintaining its effective clinical performance as well as its adhesive properties constantly universal adhesive systems are being launched. This study aims to compare the techniques "dry" and "wet" for adhesion through microtensile test using a universal adhesive system, Single Bond Universal. Sixty intact third molars will be used, they will be embedded in PVC pipes by means of acrylic resin, the coronal portion will be out of the tube. The occlusal surface of each tooth will be sectioned to obtain flat dentin surface free of enamel. The teeth will be rubbed with 220 grit paper to obtain a standard smear layer. The adhesive systems used will be the Scotchbond Multi-purpose and Single Bond Universal analyzing the adhesive techniques conventional or dry, resulting in four experimental groups. Blocks of Filtek Z250 will be made, occupying the whole area of dentin and its height will be approximately 5mm. The specimens will be sectioned making cuts perpendicular to the long axis of the tooth, then perpendicular to the first cuts will be made to obtain 1x1mm sticks. Each stick will be made up of tooth adhesive interface and composite resin. The specimens will have their ends fixed in devices for microtensile and will undergo a universal testing machine (Kratos) and pulled at a constant speed of 0.5 mm / min until the specimen fracture occurs. The maximum tensile strength value will be used for calculation of bond strength in MPa. The bond strength data (in Mpa) will be analyzed according to normality and the homoscedasticity data. The overall level of significance will be 5%.