Resumo

SCHALCH, Max Von et al. Flexural strength of feldspathic porcelain: effect of mechanical cycling and fatigue limit by the staircase method. Rev. Bras. Odontol. [online]. 2013, vol.70, n.1, pp. 12-16. ISSN 1984-3747.

This study evaluated the fatigue limit (FL) by the staircase method and the effect of mechanical cycling on the flexural strength (FS) of Duceragold feldspathic porcelain. Specimens (25 x 5 x 2 mm) were made according to manufacturer’s directions and submitted to t hree-point fl exural s trength t est (n = 10). To d etermine FL (n = 30; 10,000 cycles; 2 Hz), an initial loading of 60% of the FS and an incremental loading (step) of 3% of the FS were used. Data were analyzed by Anova and Tukey´s test (p < 0.05). Although the proposed cycles have not reduced FS significantly, fractography analysis showed striation, characteristic signs of mechanical fatigue.

Palavras-chave : dental materials; dental porcelain; material resistance; fatigue..