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天然牙主要受龋蚀、磨耗及折裂的损害。常见为牙尖的折裂,隐裂比较难以诊断,要靠医师的诊断能力而判定,Cameron于1964及1976年,Stanely于1968年及其他一些学者分别论述了隐裂的现象,过去十年研究的结果指出,牙折是一种值得引起注意的牙科疾患,尤其是40岁以上的患者更应给予重视。临床印象因牙折而拔除者,仅次于龋蚀及牙周病,牙髓病学者调查证实隐裂占就诊
Natural teeth are mainly affected by caries, wear and tear damage. Common cusp fracture, crack more difficult to diagnose, rely on the ability of doctors to judge, Cameron in 1964 and 1976, Stanely in 1968 and other scholars were discussed in the crack of the phenomenon of the past decade research The results show that the tooth is a deserving attention dental disease, especially in patients over the age of 40 should pay more attention. Clinical impression due to tooth extraction and removal, second only to caries and periodontal disease, endodontic scholars confirmed that the diagnosis of cryptorchidism