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目的 通过对儿童乳牙反畸形各种可能致病因素的逐步回归分析,探讨引起乳牙反(牙合)畸形的主要危险因素.方法 对100例乳牙反畸形患儿和100例正常(牙合)儿童做问卷调查,将结果用Logistic回归法分析,提取有效因素,研究乳牙反畸形与相关危险因素之间的关系.结果 按其贡献大小,共有喂养方式、家族史及咬上唇三种危险因素进入方程.结论 喂养方式、家族史及咬上唇是导致乳牙反畸形的主要危险因素.“,”Objective To discover the risk factors of crossbite in primary dentition by logistic regression analysis, Methods Questionnaires of disease causes were filled in by 100 cases with erossbite malocclmion in primary dentition and 100 cases with normal occlusion,and the results were analyzed by logistic regression analysis. Results Sucking habit,genetic factor and upper lip biting entered the equation according to their at-tribution. Conclusions Sucking habit,genetic factor and upper lip biting are the risk factors of crossbite in primary dentition.