Adhesive Fatigue Characteristics of Dental Composite Resins

修复的牙科材料在口腔中反复经受严重的机械和物理应力。为了评价牙科材料的力学性能，应采用动态测试方法代替静态测试方法。本文所研制的循环疲劳试验装置是一种耐久、准确、可靠的试验装置，可用于水中疲劳剪切粘结强度的测试。在复合树脂与牙体表面的粘结特性方面，未发现静态剪切粘结强度与疲劳剪切粘结强度之间的相关性.光固化玻璃离子衬层材料与牙本质表面的粘结特性也得到了类似的结果.建议用环形试样测定断裂韧性（Klc）是评价脆性粘结断裂的最合适方法。

Restored dental materials undergo repeated severe mechanical and physical stress in the oral cavity. To evaluate the mechanicl properties of the dental materials, a dynamic testing method Is desired Instead of a static one.1. The cyclical fatigue testing device which was constructed as a trial to measure the fatigue shear bond strength in water is durable, accurate and relitable2. On the bond characteristics of composite resin to the dental surface, we could not find the correlation between the static shear bond strength and the fatigue shear bond strength.3. A similar results mentioned above was obtained on the bond characteristics of light-cured glass ionomer lining materials to the dentin surface.4. It was suggested that determination of fracture toughness (Klc) using the ring specimen is the most appropriate method for the evaluation of brittle bond fracture.