Bergoli C, Amaral M, Baldissara P, Valandro L F
Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil.
Minerva Stomatol. 2011 Jun;60(6):303-9.
Aim of this study was to evaluate the fatigue resistance of bovine roots adhesively restored with three fiber posts.
Twenty-four single-rooted bovine teeth were allocated into three groups (N.=8): Gr1- White Post DC; Gr2- DT Light Post; Gr3- FRC Postec Plus. Teeth were prepared using the preparation drill of the specific fiber post system for each group. After the specimen was embedded in a cylinder, using acrylic resin, up to 3 mm of the most coronal portion of the specimen, the posts were all cemented with same materials: Single Bond + Relyx CRA. After cementation, a standard core build-up was made with composite resin. The specimens were submitted to mechanical cycling (1.400.000, 50N, 8 Hz, 37°C). After fatigue testing, a score was given to each specimen. The scores were submitted to Kruskal-Wallis (α=0.05) and the fractures were observed.
The performance after mechanical fatigue cycling was similar for the three fiber posts systems (P=0.366). Just one failure was noted from each group, a failure at the composite core.
The tested fiber posts had good performance, but attention should be taken regard of the adhesion of composite core to fiber past.
本研究旨在评估用三种纤维桩粘结修复的牛牙根的抗疲劳性能。
将24颗单根牛牙分为三组（每组n = 8）：第1组 - 白色桩DC；第2组 - DT轻型桩；第3组 - FRC Postec Plus。使用每组特定纤维桩系统的预备钻对牙齿进行预备。将标本嵌入圆柱体后，用丙烯酸树脂填充，直至标本最冠部3毫米处，所有桩均用相同材料粘结：单键 + Relyx CRA。粘结后，用复合树脂进行标准的核修复。将标本进行机械循环（1400000次，50N，8Hz，37°C）。疲劳测试后，给每个标本打分。将分数提交给Kruskal-Wallis检验（α = 0.05）并观察骨折情况。
三种纤维桩系统在机械疲劳循环后的性能相似（P = 0.366）。每组仅记录到一次失败，均为复合核处的失败。
测试的纤维桩性能良好，但应注意复合核与纤维桩的粘结情况。
