In vivo degradation of resin-dentin bonds in humans over 1 to 3 years
In vivo degradation of resin-dentin bonds in humans over 1 to 3 years
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DOI：
10.1177/00220345000790060601
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发表时间：
2000-06-01
影响因子：
7.6
通讯作者：
Oguchi, H
中科院分区：
文献类型：
--
作者：
Hashimoto, M;Ohno, H;Oguchi, H
树脂充填体的寿命是目前粘接牙科学中非常感兴趣的一个领域。然而，没有工作已经进行了调查的耐久性树脂牙本质粘结结构使用人体基板在体内。本研究的目的是调查树脂牙本质粘结结构在口腔环境中老化1，2，3年的降解。在乳磨牙中制备洞，并将粘合剂树脂系统（Scotchbond Multi-Purpose）应用于洞。1 ~ 3年后，在恒牙萌出后，拔除树脂修复牙。拔牙后，立即将这些牙齿垂直于粘合剂界面进行切片，并修剪以产生沙漏形样本。然后，以1.0 mm/min的十字头速度进行微拉伸试验。通过单因素方差分析和Fisher's PLSD检验对平均粘结强度进行统计学比较（p < 0.05）。此外，通过SEM观察所有断裂表面，并通过数字分析仪在SEM显微照片上计算失效模式的面积分数。所有3组之间的拉伸粘结强度存在显著差异（p < 0.05），平均值范围为28.3 +/- 11.3 MPa（对照组）、15.2 +/- 4.4 MPa（1 - 2年）和9.1 +/- 5.1 MPa（2 - 3年）。此外，根据断口分析，在口腔环境中老化的标本的断裂面处的脱矿牙本质的比例大于对照标本。此外，在口腔环境中老化的样本中观察到树脂复合材料的降解和胶原纤维的消耗。本研究结果的分析表明，在口腔中老化后，树脂-牙本质粘结结构发生降解。
The longevity of resin restorations is currently an area of great interest in adhesive dentistry. However, no work has been conducted to investigate the durability of resin-dentin bond structures using human substrate in vivo. The purpose of this study was to investigate the degradation of the resin-dentin bond structures aged in an oral environment for 1, 2, or 3 years. Cavities were prepared in primary molars, and an adhesive resin system (Scotchbond Multi-Purpose) was applied to the cavity. After 1 to 3 years, following the eruption of the succedaneous permanent teeth, the resin-restored teeth were extracted. Immediately after extraction, those teeth were sectioned perpendicular to the adhesive interface and trimmed to produce an hourglass-shaped specimen. Then, a micro-tensile test was performed at a crosshead speed of 1.0 mm/min. The mean bond strengths were statistically compared with one-way ANOVA and Fisher's PLSD test (p < 0.05). Further, all fractured surfaces were observed by SEM, and the area fraction of failure mode was calculated by means of a digital analyzer on SEM photomicrographs. There were significant differences in tensile-bond strength among all 3 groups (p < 0.05), with mean values ranging from 28.3 +/- 11.3 MPa (control), to 15.2 +/- 4.4 MPa (1 to 2 years), to 9.1 +/- 5.1 MPa (2 to 3 years). Moreover, under fractographic analysis, the proportion of demineralized dentin at the fractured surface in specimens aged in an oral environment was greater than that in control specimens. Furthermore, degradation of resin composite and the depletion of collagen fibrils was observed among the specimens aged in an oral environment. Analysis of the results of this study indicated that the degradation of resin-dentin bond structures occurs after aging in the oral cavity.