中文摘要：

背景：有临床科室采用瓷套冠方法对烤瓷冠桥崩瓷患者进行崩瓷修补，取得了不错效果。 目的：检测烤瓷套冠单冠黏结强度的大小，判断烤瓷套冠在修补崩瓷临床应用中的可行性，同时观察烤瓷套冠修复崩瓷过程中喷砂处理和硅烷偶联剂处理金属黏结表面对其黏结强度的影响。 方法：用失蜡法铸造相同规格钴铬合金套冠，选择表面无气孔、无铸造缺陷的试件20件，常规打磨，超声清洗后随机分为4组，分别进行喷砂处理、硅烷偶联剂处理及喷砂＋硅烷偶联剂处理，以未作任何处理的为对照组。将处理后的试件用聚羧酸锌水门汀进行黏结，采用万能力学测试仪测试拉伸强度。 结果与结论：对照组、喷砂组、硅烷偶联剂组、喷砂＋硅烷偶联剂组的拉伸强度分别为（0.68±0.04），（1.00±0.02），（1.31±0.08），（1.09±0.04） kN，各组间比较差异有显著性意义（P均〈0.01）。对照组金属表面光滑，可见一些不规则的表浅细小纹络；喷砂组金属表面呈现出不规则的鳞状突起，有利于黏结剂的渗入；硅烷偶联剂组金属表面表现为规则的蜂窝状结构，有利于黏结剂的嵌合；喷砂＋硅烷偶联剂组金属表面表现为大小不等的金属突起，金属表面粗糙，利于黏结。说明喷砂和硅烷偶联剂均能显著提高金属套冠间的黏结强度，并且硅烷偶联剂处理效果最好，其次为喷砂联合硅烷偶联剂处理。

英文摘要：

BACKGROUND：Porcelain jacket crowns have achieved good results in the repair of porcelain ceramic crown and bridge colapse. OBJECTIVE：To test the bond strength of single porcelain jacket crown, thus determining the feasibility of clinical application of repairing colapsed crown and fixed bridge by porcelain jacket crown, and meanwhile to discuss the influence between blastsanding and silane coupling agent treatment on the metal bonding strength in the repair of porcelain fracture. METHODS： The porcelain jacket crown was cast in the same shape from disk-shaped waxpatterns. Twenty specimens were chosen without blowholes and casting defects and they were al routinely burnished and cleaned in an ultrasonic bath and dried using an oil-free air stream stand-by. Then we randomly divided the specimens into four groups： specimens were treated with nothing （control）, sandblast, silane coupling agent and sandblast＋silane coupling agent, respectively. Each of the specimen was bonded with Poly-F Plus. AG-10TA universal testing machine was used to test the tensile strength. RESULTS AND CONCLUSION：The tensile bond strength of control, sandblast, silane coupling agent and sandblast＋silane coupling agent groups respectively were （0.68 0.04）, （1.00 0.02）, （1.31 0.08）, and （1.09 0.04） kN. There were significant differences between groups （P 〈 0.01）. In the control group, the metal surface was smooth, showing some irregular smal superficial veins. In the sandblast group, the metal surface showed irregular scaly protrusions conducive penetrate adhesives. In the silane coupling group, the metal surface manifested a＆nbsp;honeycomb structure in favor of chimeric adhesives. The sandblast＋silane coupling agent group showed some metal projections ranging in size, on the rough metal surface, which was conducive to bond. Porcelain jacket crown applied to repair colapsed crown and fixed bridge is feasible. Sandblasting and silane coupling agent can improve bond strength of porcelain jacket crown.