根据牙髓状况和折裂程度,活髓牙和死髓牙的折裂可分为完全折裂和不完全折裂。其中,活髓牙的不完全折裂称为牙隐裂[1],是牙冠表面非生理性细小裂纹,常不易被发现,深的隐裂可导致不可复性牙髓炎。在一些发达国家,牙隐裂已成为继龋病和牙周病之后导致牙缺失的第3大病因[2]。牙隐裂虽较多见,但易被忽略,如处理不当常导致牙折,甚至拔牙。2009年1月—2012年12月,我们诊治牙隐裂致不可复性牙髓炎58例。现分析报告如下。 According to the status of pulp and the degree of fracture, the live pulp and dead pulp tooth fracture can be divided into complete fracture and incomplete fracture. Among them, the incomplete fracture of the vital pulp teeth is called the tooth crack [1], is a non-physiological small cracks on the surface of the crown, often difficult to be found, deep crack can lead to irreversible pulpitis. In some developed countries, occlusion of the tooth has become the third leading cause of tooth loss following caries and periodontal disease [2]. Although the occlusion is more common, but easily overlooked, such as improper handling often lead to tooth or tooth extraction. From January 2009 to December 2012, 58 cases of refractory pulpitis were diagnosed and treated. The analysis report is as follows.