变异带环冠防治后牙纵折高小燕王凤仙李南德夏宁（湖北医科大学口腔医学院修复科４３００７０）保护和延长天然牙的使用寿命是我们口腔医务工作者的共同责任。许多学者认为：牙折已成为仅次于龋病和牙周病的第三大疾病。因此，防治牙齿折裂显得尤其重要。本文主要从修复学... Variation with the crown after the ring to prevent and control fold Xiaoyan Wang Fengxian Li Nan De Xia Ning (Department of Stomatology, Hubei Medical University, 430070) To protect and extend the service life of natural teeth is the common responsibility of our stomatological workers. Many scholars believe that: tooth fold has become second only to dental caries and periodontal disease the third largest disease. Therefore, prevention and treatment of tooth fracture is particularly important. This article mainly from the repair school ...