摘要
目的:研究早产低出生体质量儿乳牙初萌时间,并追踪观察早产低出生体质量儿多个时间点乳牙萌出的数目,探索影响乳牙萌出的相关因素。方法:选择早产低出生体质量儿35例和足月出生婴儿71例为对象,定期进行口腔检查并记录牙齿初萌时间、萌出牙位、萌出数目,统计分析孕周、出生体质量、性别、分娩方式、胎数、喂养方式等因素对乳牙萌出有无影响。结果:①两组最早萌出的牙均为下颌乳前牙,足月儿乳牙初萌明显早于早产低出生体质量儿(P<0.05),其中早产低出生体质量儿乳牙初萌年龄平均为出生后8.9个月,足月儿为出生后7个月;②按照牙齿初萌的生理年龄计算,早产低出生体质量儿牙齿初萌为70.4周,而足月儿为67.3周,两组婴儿间无统计学差异(P>0.05);③早产低出生体质量儿在出生后9个月、12个月时牙齿萌出数目明显低于足月儿(P<0.05);④在影响牙齿萌出的相关因素中,孕周、出生体质量与牙齿初萌年龄呈明显负相关,与牙齿萌出数目明显正相关;而喂养方式、性别、分娩方式以及胎数对乳牙萌出时间没有影响。结论:早产低出生体质量儿乳牙初萌明显较足月儿推迟,但以生理年龄计算,两组婴儿牙齿初萌时间无统计学差异。出生体质量与孕周是影响牙齿初萌时间和牙齿萌出数目的相关因素。
AIM： To compare the eruption time of first deciduous tooth in low birth-weight prematurely born children with normal birth weight full-term born children so as to find out whether the eruption of first deciduous tooth is affected by the birth status. METHODS： Thirty-five low birth weight prematurely bona infants and 71 normal birth weight full-term born children were included in this study. Dental examination was performed at 6, 9 and 12 months and all the eruption teeth were recorded. Birth status data was obtained from the medical history of hospital. RESULTS ： The first erupted deciduous tooth in both groups was mandibular central incicor. Eruption was significantly delayed in low birth-weight prematurely born group （8.9 months post birth） than in normal birth weight full-term born group （7 month post birth） （P 〈 0.05 ）. When gestational age was also considered, no difference was found in decidu- ous tooth eruption time between the two groups （70. 4 week in low birth- weight group, 67. 3 week in normal birth-weight group） （P = 0. 058 ）. Nine and 12 months after birth, the number of erupted tooth was significantly smal- ler in low-birth weight group （ P 〈 0.05 ）. Birth weight and gestational age were negatively related with tooth eruption time and positively related with the number of erupted tooth. CONCLUSION： Birth weight and gestational age are in- fluencing factors of deciduous tooth eruption.
出处
《牙体牙髓牙周病学杂志》
CAS
北大核心
2012年第12期718-721,共4页
Chinese Journal of Conservative Dentistry
基金
深圳市科技计划基金项目(200903106)
关键词
牙齿萌出
乳牙
早产
低出生体质量
婴儿
tooth eruption
deciduous tooth
premature
low birth-weight
infant
