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Studies on the testing methods for interfacial fracture toughness for evaluating the interfacial property of dental prostheses.

评价牙修复体界面性能的界面断裂韧性测试方法研究

基本信息

批准号：
06671945
负责人：
NAGAI Masahiro
金额：
$ 1.34万
依托单位：
Tokyo Medical and 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：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Testing method for interfacial fracture toughness (modes I and II) between two different materials in a dental prosthesis, such as opaque porcelain/metal and adhesive resin/metal interfaces, was investigated by changing thickness, width, length and intial crack length of test specimen. Test specimen is of sandwich construction with an intial crack. In mode I testing, the test speciman was loaded by using two square cross-sectional block with a hole for loading bonded on test specimen end. And the crack length was measured by using a traveling microscope in conjunction with the measurement of the marginal load and crack opening displacement. Mode II testing was done by 3-point bending test. From their results of measurement, both values of interfacial fracture toughness was obtained. Results obtained are as follows. In case of the opaque porcelain/metal test specimen, its thickness of 0.3-0.5mm and its width of 3-5mm were appliciated, and its length was enough in region of 30-40mm. Initial crack length in region of 8-10mm was reasonable. Testing speed of 0.05mm/min was appreciated. As reference data, interfacial fracture toughness of this test specimen was about 15j/m^2. Next, in adhesive resin/metal test specimen, its thickness in region of 1.5-2.0mm was reasonable because the values of fracture toughness were shown for 400-500j/m^2. Width of 5mm was good than that of 10mm considering the procedure of adhesion. Length was 50mm only. By the way, thickness of adhesive resin layr was about 70mum. Initial crack length of 15-20mm was good because th crack length propagated was comparatively easy to measure. Therefore, in order to evaluate the interfacial property, it was recognized that such the testing methods for fracture toughness were more effective.

通过改变试样的厚度、宽度、长度和初始裂纹长度，研究了假牙中两种不同材料（例如不透明瓷/金属和粘合树脂/金属界面）之间的界面断裂韧性（模式I和II）的测试方法。测试样本为夹层结构，带有初始裂纹。在模式I测试中，通过将两个带有加载孔的方形横截面块粘合在测试样本端部来加载测试样本。并且使用移动显微镜结合边缘载荷和裂纹张开位移的测量来测量裂纹长度。模式II测试通过三点弯曲测试进行。根据他们的测量结果，获得了界面断裂韧性的两个值。得到的结果如下。对于不透明瓷/金属试件，其厚度为0.3-0.5mm，宽度为3-5mm，长度在30-40mm范围内就足够了。初始裂纹长度在8-10mm范围内是合理的。 0.05mm/min 的测试速度受到赞赏。作为参考数据，该试件的界面断裂韧性约为15j/m^2。接下来，在粘合树脂/金属测试样品中，其厚度在1.5-2.0mm范围内是合理的，因为断裂韧性值显示为400-500j/m^2。考虑到粘合过程，5mm 的宽度比 10mm 的宽度好。长度仅为50毫米。顺便提及，粘合树脂层的厚度约为70μm。初始裂纹长度为 15-20mm 较好，因为扩展的裂纹长度相对容易测量。因此，为了评价界面性能，人们认为这种断裂韧性的测试方法更为有效。