da Rosa Ricardo Abreu, Bergoli Cesar Dalmolin, Kaizer Osvaldo Bazzan, Valandro Luiz Felipe
Oral Science, School of Dentistry, Federal University of Santa Maria, Rio Grande do Sul, RG, Brazil.
Gen Dent. 2011 Jul-Aug;59(4):e156-61.
The aim of this study was to assess the influence of mechanical cycling and cement thickness on the bond strength between fiber posts and root dentin. Forty bovine teeth were sectioned (16 mm) and randomly assigned to four groups (n = 10). Specimens in Groups 1 and 2 were cemented using a thinner cement layer, while specimens in Groups 3 and 4 were cemented using a thicker cement layer. Groups 2 and 4 were submitted to mechanical cycling. Four slices per specimen were produced and submitted to push-out testing. Bond strength values were not affected by mechanical cycling (P = 0.2893), although the thickness of the cement layer did affect bond strengths (P = 0.0059, thinner > thicker). Tukey's test showed that Group 1 (19.27 MPa) had a higher mean bond strength value than Group 3 (12.4 MPa) and Group 4 (13.6 MPa), while Group 2 (15.0 MPa) was statistically similar to all groups. These results indicate that a thicker cement layer negatively affected the push-out bond strength between a fiber post and root dentin, regardless of whether the specimens were subjected to mechanical cycling.
本研究的目的是评估机械循环和粘结剂厚度对纤维桩与牙根牙本质之间粘结强度的影响。将40颗牛牙切成16毫米长，并随机分为四组（每组n = 10）。第1组和第2组的样本使用较薄的粘结剂层进行粘结，而第3组和第4组的样本使用较厚的粘结剂层进行粘结。第2组和第4组进行机械循环处理。每个样本制作4个切片，并进行推出试验。粘结强度值不受机械循环的影响（P = 0.2893），尽管粘结剂层的厚度确实会影响粘结强度（P = 0.0059，较薄>较厚）。Tukey检验表明，第1组（19.27MPa）的平均粘结强度值高于第3组（12.4MPa）和第4组（13.6MPa），而第2组（15.0MPa）在统计学上与所有组相似。这些结果表明，无论样本是否进行机械循环处理，较厚的粘结剂层都会对纤维桩与牙根牙本质之间的推出粘结强度产生负面影响。
