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Influence of accelerated aging on the fracture resistance of dental polymers.

Grant number: 12/11407-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): November 01, 2012
Effective date (End): March 31, 2013
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal Investigator:Andréa Cândido dos Reis
Grantee:Fabio Santos Bottacin
Home Institution: Faculdade de Odontologia de Ribeirão Preto (FORP). Universidade de São Paulo (USP). Ribeirão Preto , SP, Brazil


This study will investigate the influence of accelerated aging on the compressive strength of four composite resins. Will be used for a nylon matrix making a total of 64 specimens with 8.0 mm in height and 4.0 mm wide, 16 of each of the resins: Filtek Supreme (3M), Charisma (Heraeus Kulzer), Filtek Z-250 (3M) and P-90 (3M). To prepare the samples used will be the incremental technique respecting the curing time specified by the manufacturer. After 24 hours, eight of the specimens of each material shall be submitted to compression test in a universal testing machine (EMIC DL-2000) with load cell 2000Kgf and speed of 0.05 mm / min. The remaining 8 specimens are submitted to accelerated aging in UV-C machine system Accelerated Aging to nonmetallic - ASTM G-53 for 192 hours, equivalent to about five years of clinical conditions in normal aging, and subsequently be subjected to compressive test. Upon completion of the tests, the mean compressive strength readings for each body-of-evidence will be submitted to the Kolmogorov-Smirnov test (p> 0.05), ANOVA and Tukey test (p <0.05). The software used for statistical analysis will be the NCSS 2007 (NCSS, Kaysville, USA.