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Effect of artificial aging on the bond strength of composite repairs using composite resins of different viscosities

Grant number: 12/07147-4
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2012
Effective date (End): October 31, 2013
Field of knowledge:Health Sciences - Dentistry - Dental Clinics
Principal Investigator:Taciana Marco Ferraz Caneppele
Grantee:Raira Cruz Calamari
Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil


Objectives: to evaluate the effects of different viscosities of composite resin using as restoration repair and the effect of artificial aging on these repairs. Material and Methods: One hundred and twenty truncated cones of Grandio SO (VOCO) will be prepared. Sixty specimens are subjected to artificial aging for thermocycling (5000 cycles) and the other remaining 60 will be used as a positive control and receive immediately after preparation the other resin cone on it by varying the viscosity of the resin used. After thermo-cycling, the specimen's surface will be sandblasted with aluminum oxide, cleaned with air/water spray and conditioned with phosphoric acid for 15s. After that, one coat of Admira Bond Adhesive (VOCO) was applied and light cured for 20s. Over the original specimens, a sectional cone-shape teflon matrix will be hold in position and the cones will be built. Specimens will be divided into 3 groups according to the repair material used (n=20): Group 1: Conventional Resin - Grandio SO, Group 2: Grandio SO Heavy Flow resin (F) and Group 3 :A thin layer of Flowable resin - Grandio Heavy Flow + conventional Resin (FR). Each group will be divided into two subgroups according to the time the bond strength test will be performed. For the subgroup I, the specimens shall be subjected to bon strength test 24h after restoration. For the subgroup C, the specimens shall be subjected to artificial aging by thermocycling (5000 cycles) before the bond strength test. Data will be collected and analyzed statistically.(AU)

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