烤瓷熔附金属全冠及金属铸造全冠 ,因其美观、强度高 ,边缘适合性和生物相容性好[1] ,目前正广泛应用于牙体缺损 ,牙列缺损的修复 ,深受患者喜爱。但在临床应用上 ,这两种冠的颈部折断时有发生 ,临床医生在寻找折断原因的同时 ,考虑最多的是如何将完好的冠再次使用 ,为此我们进 Porcelain fused to metal crown and metal casting crown, because of its beautiful, high strength, edge fit and good biocompatibility [1], is now widely used in tooth defects, dentition defect repair, by the deep Patients love. However, in clinical application, the crown of the two kinds of crown fracture occurs from time to time, the clinician looking for reasons for breaking at the same time, the most considered is how to use the intact crown again, for which we