近年来,牙齿破裂症已受到愈来愈多的口腔临床学家们的重视,并被列为第三位重要的牙齿疾病。隐裂牙是其中的一种特殊类型,其裂为原发性,发生在未经任何治疗的活髓牙上,故有重要的临床意义。国内外单独报导这型牙裂的文献极少;有关牙裂发生的易感因素和致裂因素的分析多是根据临床现象观察推测而论的。到目前为止,尚未见到任何实验证据用以说明隐裂在牙齿上发生的原因和机 In recent years, dental rupture has been paid more and more attention by oral clinicians and ranked as the third most important dental disease. Cracked tooth is one of the special types, which split the primary, occurred in the untreated live pulp teeth, it has important clinical significance. Domestic and foreign reports of this type of tooth splitting rarely documented; the incidence of susceptible factors and fracture analysis of factors are mostly based on clinical observations speculated. So far, no experimental evidence has been found to illustrate the causes of the occlusion on the teeth and the mechanism