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Effect of Adherend Characteristics for Bond Strength of Dental Resin Adhesives

被粘物特性对牙科树脂粘合剂粘合强度的影响

基本信息

批准号：
60570906
负责人：
NOGUCHI Hakuju
金额：
$ 1.02万
依托单位：
Tohoku Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60570906/
关键词：
Resin adhesives Characteristics of adherend Bond strength Endurance Thermal cycling Human tooth 牛歯

项目摘要

Recent resin adhesives had very strong bond strength. However, it is doubtfull in endurance of the bond strength for clinical use. In this study, the following became clear on the above problem.1. Creation of the testing condition for bond strength deterioration by thermal cycling. Desirable temperature of thermal cycling bath are 5゜C and 60゜C, and the specimens should be keep for 30 seconds in each bath. The adequate number of thermal cycling are 1000 times per day.2. Effects of the thermal expansion coefficient of adherends for the deterioration of bond strength. It will be one of the causes of the deterioration that the strain by thermal cycling resulting from the difference of the thermal expansion coefficient between the adherends and adhesives. But, the assumption are not recognized, because the strain are absorved into the elastic limit of resin adhesives.3. Correlation between the bond strength and rigidity of adherends. The bond strength become very weak by to deform the adherend. It proved the above phenomenon, using the dental alloys and human or bovine tooth with various hardness. In case of alloys, there exists an obvious relation between the hardness and bond strength. The rizing gradient of bond strength for Vickers hardness of enamel is about 1 .But,the relation in teeth is relatively small,for large deviation in the hardness or stucture. And, the bovine teeth are able to use as substitutes of human teeth in these testing, for the both had a very similar bond strength.4. Comparison the bond strength measured in vivo and in vitro. We directly measured the bond stength in vivo by shear and tensile, using stainless steel lingual botton attached onto the surface of tooth. This values agrees with the results obtained in vitro. But, the bond strength measured by shear are relatively large compared to the values by tensile.

最近的树脂粘合剂具有非常强的粘合强度。然而，临床使用的粘合强度的耐久性值得怀疑。本研究针对上述问题，明确了以下几点： 1．创建热循环引起的粘合强度劣化的测试条件。热循环浴的理想温度为5゜C和60゜C，并且样品应在每个浴中保持30秒。热循环次数以每天1000次为宜。2．被粘物热膨胀系数对粘合强度劣化的影响。被粘物与粘合剂之间的热膨胀系数差异引起的热循环应变将是劣化的原因之一。但是，这个假设不被认可，因为应变被吸收到树脂粘合剂的弹性极限中。 3．粘合强度与被粘物刚性之间的相关性。由于被粘物变形，粘合强度变得非常弱。使用牙科合金和不同硬度的人或牛牙齿证明了上述现象。对于合金，硬度和结合强度之间存在明显的关系。粘结强度与牙釉质维氏硬度的关系梯度约为1。但在牙齿中，由于硬度或组织的偏差较大，其关系相对较小。而且，在这些测试中，牛牙齿可以用作人类牙齿的替代品，因为两者具有非常相似的粘合强度。 4．比较体内和体外测量的粘合强度。我们使用附着在牙齿表面的不锈钢舌侧按钮，通过剪切和拉伸直接测量体内粘合强度。该值与体外获得的结果一致。但是，与拉伸测量的值相比，通过剪切测量的粘合强度相对较大。