Development on mechanical evaluation system of resin-bonded partial denture of which abutment tooth model sways

树脂粘接局部义齿固位体的设计取决于其力学性能。本研究考察了五种市售粘合剂树脂（SB、SBO、PV、BR和ID）的拉伸粘合强度、断裂韧性（双悬臂梁（DCB）试验）和耐久性（4/60℃热循环试验（5000次循环）和重复恒定位移下的DCB试验）。主要研究结果如下。将不加填料的SB组和加填料的PV、BR、ID组大致分为两组，其粘接强度基本相同。而SB的断裂韧性值是PV、BR和ID值的10倍以上，存在较大差异。因此，填料含量对断裂韧性的影响很大。在热循环试验后的粘接强度方面，与SBO、PV和BR相比，SB的值有所降低。热循环试验后断裂韧性方面，SB值较PV、BR和ID值明显降低，断裂模式由黏结断裂转变为界面断裂。因此，发现粘接强度和断裂韧性在力学性能上存在物理差异。在重复恒位移作用下的DCB试验中，PV的裂纹扩展速率值明显大于sb的裂纹扩展速率值，因此，对于基牙的相对摇摆，添加填料的粘接树脂效果不佳。从这些基本的测试结果来看，在树脂粘结局部义齿的长期寿命设计中，建议选择带填料的粘结树脂是不可取的。因此，在这些力学性能的基础上，选择合理的树脂粘接局部义齿的粘接树脂是非常重要的。

A design of retainer of a resin-bonded partial denture is depended on mechanical properties. This study examined tensile adhesive strength, fracture toughness (double cantilever beam (DCB) test) and durability (4/60-degree C thermal-cycling test (5000 cycles) and DCB test under repeated constant displacement) on five commercially available adhesive resins (SB,SBO,PV,BR and ID). The major findings were as follows. When classified roughly in-group of SB without filler and group of PV, BR and ID with filler, that adhesive strength was almost similar. However, a value of fracture toughness of SB showed more than ten times of value of PV, BR and ID, and a considerable difference was recognized. Thus, the fracture toughness is greatly influenced filler content. About adhesive strength after thermal cycling test, the value of SB decreased comparing with their values of SBO, PV and BR.About fracture toughness after thermal-cycling test, the value of SB considerably decreased comparing with their values pf PV, BR and ID to decrease inconsiderably, and the fracture mode changed into interfacial fracture from cohesive fracture. Thus, it was found that adhesive strength and fracture toughness differed physically in mechanical property. In DCB test under repeated constant displacement, a value of crack propagating rate of PV was considerably larger than that of SB.Accordingly, for abutment tooth swaying comparatively, an adhesive resin with filler was not pleasing. From these fundamental testing results, in a long-term life design of resin-bonded partial denture, it was suggested that selection of adhesive resin with filler was not desirable. Therefore, on the basis of these mechanical properties of adhesive resin, it was important to select an adhesive resin to be reasonable to a resin-bonded partial denture.