In Vitro Fatigue Resistance of Teeth Restored With Bulk Fill versus Conventional Composite Resin

摘要: The aim of this study was to compare the fatigue resistance restored teeth with bulk fill composite resin, conventional resin incremental insertion and unprepared sound teeth. Twenty-eight extracted maxillary premolars were selected divided into 4 groups based on technique: control (C), (I) three (BF3) or single increment (BF1). specimens submitted test a 5 Hz frequency. An initial application 5,000 sinusoidal load cycles minimum force 50 N maximum 200 used. Next, applied stages 30,000 increasing gradually: 400, 600, 800, 1000, 1200 1400 N. concluded when 185,000 achieved specimen failed. data recorded for comparison, using Kaplan-Meier survival curve analyzed by log-rank at 0.05 significance. Fractures classified position failure - above below cementoenamel junction (CEJ). Statistical analysis showed significant difference between (p=0.001). fracture demonstrated that only 28.58% failures CEJ in group C, while I, BF1 BF3 they 42.85%, 85.71% 85.71%, respectively. Teeth both techniques present similar values compared those composite, strength higher. Furthermore, lower percentage fractures CEJ.