A tensile test to facilitate identification of defects in dentine bonded specimens
A tensile test to facilitate identification of defects in dentine bonded specimens
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DOI：
10.1016/s0300-5712(97)00021-3
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发表时间：
1998-05-01
影响因子：
4.4
通讯作者：
Arao, T
中科院分区：
文献类型：
--
作者：
Nakabayashi, N;Watanabe, A;Arao, T
目的：探讨一种更易于识别牙本质粘结缺陷(S)的小型化哑铃试验方法的有效性。方法：提取的人牙本质基质在与4-META/MMA-TBB树脂粘接之前，用10-3的溶液预处理10、30或60 S。由树脂粘结试件制备了小型化哑铃形试件。在37摄氏度的水中储存24小时后，样品被拉伸加载到破坏。结果：经10 S处理后的粘接树脂内存在粘结破坏，拉伸粘结强度良好。经30和60 S处理的试件粘结强度明显降低，在扫描电子显微镜和透射电子显微镜下可以很容易地识别出这些试件中以前难以识别或不可能识别的缺陷。结论：提出的拉伸破坏和显微检查断裂的微型哑铃形试件的方法是一种简单且可重复性的测试方法。该方案能够清楚地阐明脱矿牙本质在粘结界面中有缺陷的树脂渗透。这些缺陷很难通过传统和/或ISO推荐的方法可视化。(C)1998爱思唯尔科学有限公司。保留所有权利。
Objectives: To determine the efficacy of a miniaturized dumbbell test procedure designed to more easily identify defect(s) in bonded dentine test specimens.Methods: Extracted human dentine substrates were pre-conditioned with 10-3 solution for 10, 30 or 60 s prior to dentine bonding with 4-META/MMA-TBB resin. Miniaturized dumbbell-shaped test specimens were prepared from the resin bonded samples. After 24 h storage in 37 degrees C water, the specimens were tensile-loaded to failure. Fractured surfaces and cross-sections were examined and compared under scanning electron microscopy (SEM) and transmission electron microscopy (TEM).Results: Cohesive failure within the bonding resin was observed in specimens pre-conditioned for 10 s. The tensile bond strength of these was excellent. Bond strengths of specimens that were pre-conditioned for 30 and 60 s were significantly lower, and defects in these specimens, formerly difficult or impossible to identify, were readily identified under SEM and TEM microscopy.Conclusion: The proposed method of tensile stressing to failure and microscopically examining fractured miniaturized dumbbell-shaped test specimens is a simple and reproducible test procedure. The protocol is capable of clearly elucidating defective resin infiltration of demineralized dentine in bonded interfaces. These defects are difficult to visualize by conventional and/or ISO recommended methods. (C) 1998 Elsevier Science Ltd. All rights reserved.