Jassem H A, Retief D H, Jamison H C
Am J Orthod. 1981 Jun;79(6):661-8. doi: 10.1016/0002-9416(81)90358-4.
The objective of this study was to investigate the effect of a low-viscosity sealing resin and temperature cycling on the tensile and shear strengths of bonded and rebonded attachments. Eighty extracted noncarious human maxillary central incisors were used. The tensile bond strengths of a chemically activated bonding paste to etched enamel, with and without a low-viscosity sealing resin and with and without 500 temperature cycles between 5 degrees C. and 55 degrees C., were determined. The tensile bond strengths on rebonding were determined on the same teeth in such a way that the rebonded specimens were subjected to the same two variables as the originally bonded teeth. The shear bond and rebond strengths were determined on the remaining forty teeth. The specimens were tested to failure in an Instron machine. The bond strengths were expressed in MN.m-2. Analysis of variance was used to analyze the data. Temperature cycling adversely affected tensile bond and rebond strengths, while the sealing resin had no additional effect on tensile and shear bond and rebond strengths. Tensile versus shear and bond versus rebond strengths for similarly prepared specimens were not significantly different.
本研究的目的是调查低粘度封闭树脂和温度循环对粘结及重新粘结附件的拉伸强度和剪切强度的影响。使用了80颗拔除的无龋人类上颌中切牙。测定了化学活性粘结糊剂与酸蚀釉质之间的拉伸粘结强度，分别有无低粘度封闭树脂以及在5℃至55℃之间有无500次温度循环的情况下。在相同的牙齿上测定重新粘结时的拉伸粘结强度，使重新粘结的样本与最初粘结的牙齿一样接受相同的两个变量。在其余40颗牙齿上测定剪切粘结强度和重新粘结强度。样本在英斯特朗材料试验机上测试至破坏。粘结强度以MN.m-2表示。采用方差分析来分析数据。温度循环对拉伸粘结强度和重新粘结强度有不利影响，而封闭树脂对拉伸和剪切粘结强度及重新粘结强度没有额外影响。对于制备相似的样本，拉伸强度与剪切强度以及粘结强度与重新粘结强度之间没有显著差异。
