不同代型材料对全瓷冠断裂强度和断裂类型的影响  

Effects of different die materials on fracture and failure behaviors of all-ceramic crowns

作　　者：吴晓平[1] 李大圣[2] 张骏[1] 马骁[2] 赵克[1] 张新平[2] 

机构地区：[1]中山大学光华口腔医学院·附属口腔医院修复科中山大学口腔医学研究所,广州510055 [2]华南理工大学材料科学与工程学院金属材料科学与工程系

出　　处：《中华口腔医学杂志》2009年第8期483-487,共5页Chinese Journal of Stomatology

基　　金：国家自然科学基金（50671037、30872908）;广东省自然科学基金（7001542）

摘　　要：目的通过抗折破坏实验分析3种代型材料对全瓷冠断裂强度和断裂类型的影响，探求可用于修复体力学实验的理想代型材料。方法分别用多孔镍钛合金、环氧树脂和离体牙制作代型，每组各12个；制作全瓷冠，粘接后对全瓷冠进行抗折破坏实验。记录最大载荷，即全瓷冠断裂强度。用体视显微镜观察全瓷冠的断裂类型。结果多孔镍钛合金组全瓷冠断裂强度[（1229．6±326．7）N]与离体牙组[（1159．7±256．0）N]的差异无统计学意义（P=0．524），这两组断裂强度与环氧树脂组[（883．5±198．1）N]的差异均有统计学意义（P=0．016和0．003）。全瓷冠断裂面分析显示，环氧树脂组全瓷冠骀面呈近远中向裂纹，无塑性形变及特征性裂纹，而离体牙组和多孔镍钛合金组全瓷冠主要呈现加载区表面锥体状裂纹及瓷层内表面放射状裂纹的混合性特征。结论不同的代型材料对全瓷冠断裂强度及断裂类型均有影响；多孔镍钛合金组全瓷冠的断裂类型与离体牙组相似。Objective To investigate the influence of different die materials on fracture strength and failure mode of IPS e. max Press crowns in mechanical test. Methods Thirty-six IPS e. max Press crowns were divided into 3 groups. They were cemented to extracted maxillary first premolars in Group 1, to epoxy dies in Group 2, and to porous NiTi alloy dies in Group 3 respectively. All the crowns were subjected to compressive load in an universal mechanical testing machine. The maximum fracture strength （N） was recorded and fracture modes of the tested crowns were classified. Fractographies of the failed crowns were observed with a stereomicroscope. Results Statistical analysis results showed that the mean fracture strength of the IPS e. max Press crowns on extracted natural teeth [ （ 1159. 7± 256. 0） N ] and porous NiTi alloy dies [ （ 1229. 6 ±326. 7） N ] were obviously higher than that of epoxy dies [ （883.5 ± 198. 1 ） N, P = 0. 016 and 0. 003 ]. Observations of the fractographies of failed crowns showed that the crowns on epoxy die fractured mesio-distally and no plastic deformation and characteristic cracks were observed. However, crowns in the other groups showed cone cracks at the contact area on occlusal surface and radical cracks initiated from the adhesive interfaces. Conclusions Die material has a significant influence on fracture resistance and fracture mode of the IPS e. max Press crowns. The crowns cemented to porous NiTi alloy dies show a similar fracture mode as those on extracted natural teeth.

关 键 词：牙修复失效 陶瓷制品 力学 代型材料 

分 类 号：R686[医药卫生—骨科学]