目的 :本文通过普查 ,了解乳牙反的患病率 ,调查分析其病因。方法 :对 813名 2～ 6 .5岁儿童进行口腔检查 ,其中 6 9名乳牙反患者进行家长问卷调查 ,临床资料作统计与分析。结果 :乳牙反患者的患病率为 8.49%。四个年龄组中 3～ 4岁组最高 ,5～ 6 .5岁组最低 ,两者有显著性差异。其余各组及男女间均无显著性差异。结论 :乳牙反为牙性—机能性反 ,不良习惯是导致乳牙反的主要因素 Objective: In this paper, by census, to understand the prevalence of deciduous teeth, investigate the etiology. Methods: A total of 813 children aged 2-6.5 years were examined with oral questionnaires. Sixty-nine patients with primary decidua teeth were investigated by questionnaire and clinical data were analyzed. Results: The prevalence of deciduous teeth was 8.49%. Among the four age groups, the highest in the group of 3-4 years old and the lowest in the group of 5-6.5 years old were significant differences between the two groups. The remaining groups and no significant differences between men and women. CONCLUSIONS: Antegrade deciduous teeth are functional and sexual dysfunction, and bad habits are the main factors that cause decidua