Resumo

BORGES, ALEXANDRE LUIZ SOUTO et al. Assessment of flexural strength and elastic modulus of different indirect composite resins. RPG, Rev. pós-grad. [online]. 2012, vol.19, n.2, pp. 50-56. ISSN 0104-5695.

The aim of this study was to investigate the flexural fatigue behavior of six indirect composite resins and one indirect composite resin. Ten specimens (2 x 2 x 12 mm) of each composite were made according to manufacturer's instruction: Group 1 - Signum (Heraeus Kulzer), Group 2 - Solidex (Shofu Inc.), Group 3 - Resilab (Wilcos), Group 4 - Adoro (Ivoclair Vivadent), Group 5 - Admira (Voco), Group 6 - Sinfony (3M/ESPE), Group 7 - Filtek Supreme (3M/ESPE). The specimens were stored at 37oC for 24 hours. Then, they were submitted to mini-flexural test in the Test Universal EMIC at a speed of 0.75 mm/min in order to determine flexural strength and flexural modulus. The data were subjected to ANOVA and Tukey tests (5%). There were significant differences among the groups (p = 0.0001). The mean MPa (± standard deviation) of flexural strength values were: Filtek Supreme (149,12 ± 13,12 MPa)a, Sinfony (139,61 ± 7,75 MPa)ab and Adoro (136,99 ± 6,15 MPa)bc, which presented the highest flexural strength, followed by Admira (127,17 ± 6,31 MPa)cd, Resilab (125,17 ± 8,10 MPa)cd, Solidex (125,28 ± 5,80 MPa)cd and Signum (121,176 ± 2,36 MPa)e and Venus: (103,80 ± 7,08). Same letters showed no significant difference. Filtek Supreme (12,13 ± 1,82 GPa) and Sinfony (12,32 ± 1,75 GPa) showed significantly higher elastic modulus than Adoro (10,99 ± 0,15 GPa), Resilab (10,37 ± 1,45 GPa), Admira (10,17 ± 6,31 GPa), Solidex (10,02 ± 1,85 GPa), Signum (10,19 ± 1,36 GPa) and Venus: (9,33 ± 0,30). Indirect composites tested did not show enhanced flexural strength and elastic modulus properties compared to the nanoagglomerate direct composite resin.

Palavras-chave : Fatigue; Composite resins; Elastic modulus.