福建省政和县儿童第一恒磨牙和恒中切牙的萌出情况分析

Eruption of permanent first molar and central incisor in Zhenghe,Fujian Province:a clinical investigation

目的:了解当地儿童恒牙萌出规律,为儿童口腔临床诊疗提供一定的参考。方法:选取福建省北部地区政和县年龄3～8岁儿童352名,获取口腔模型,对第一恒磨牙和第一恒切牙萌出情况进行统计分析。结果:7岁年龄段上下颌第一恒磨牙和下颌恒中切牙进入集中萌出期,8岁年龄段上颌恒中切牙进入集中萌出期。在男女和左右同名牙的对比方面,除下颌恒中切牙的萌出率男性高于女性外,其他指标均未显示明显差距。结论:第一恒磨牙和恒中切牙萌出时期跨度较大,在临床上应该充分注意。该结果与国内其他地区的结果有部分差异,提示各地区的情况存在差异。

AIM： To investigate the eruption of permanent teeth of children in Zhenghe County. METHODS ： Three hundred and fifty - two children between 3 and 8 years old in Zhenghe County, Fujian Province were in- cluded in this study. Dental models were obtained and the eruption of permanent first molars and central incisors were analyzed. RESULTS： The maxillary and mandibular permanent first molars and the mandibular permanent central in- cisors mainly erupt in 7 year old children. The maxillary permanent central incisors mainly erupt in 8 year old children. No significant differences in the eruption rate between the male and the female or between the right side and the left side of teeth were observed, except that the rate of eruption of mandibular permanent central incisors in male was signif- icantly higher than that in female. CONCLUSION： We should pay attention to the long time span of permanent first molars and mandibular permanent central incisor＇s eruption. The findings seem to be different from studies conducted in other parts of China and it suggests that there might be demographical differences in the eruption of teeth.