所有选取的对象均无全身系统性疾病、无颌面部手术史及放、化疗史、无中、重度牙周炎及明显的口腔黏膜病。

None of these selected objects had the systemic disease, a history of maxillofacial surgery and radiotherapy and chemotherapy, moderate or severe periodontitis and significant oral mucosal disease.

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结果颌下温与肛温差异无显著性（P>0.05）。

Results There was no significant difference in the jaw and anus temperatures in newborns(P>0.05).

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结论：咬颌创伤，牙周疾病，牙髓无活力等是导致牙根纵裂的重要原因。

CONCLUSION: Traumatic occlusal force, periodontal lesions, teeth with root canal therapy are the major causes that led to vertical root fractures.

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