Department of Orthodontics, University of Witten/Herdecke, Alfred-Herrhausen Str. 45, 58455, Witten, Germany.
BMC Oral Health. 2023 Jul 1;23(1):437. doi: 10.1186/s12903-023-03153-1.
The purpose of the study was to determine the possible relationship between the eruption of primary and permanent teeth and neonatal factors in German children according to gender.
A cross-sectional survey study was performed in 10 German orthodontic practices. Using a questionnaire information about gender, time of birth (week of pregnancy), birth weight (g) and height (cm), and the age of first primary and first permanent tooth eruption (months/years) of 405 children (230 girls and 175 boys) were collected. A Mann-Whitney U-test was used for group comparisons, and correlations were verified using a Pearson test.
No correlation was found between neonatal factors (time of birth, birth weight, and birth height) and primary tooth eruption for male participants. However, for females a low correlation was found between the eruption of the first primary tooth and birth weight (r = -0.18, CI: -0.30 to -0.042, p = 0.011) and birth height (r = -0.19, CI: -0.32 to -0.054, p = 0.006). No correlations between neonatal factors and the eruption of the first permanent tooth were found for either gender. A moderate correlation was found between the first primary and first permanent tooth eruption (females: r = 0.30, CI: 0.16 to 0.43, p < 0.001; males: r = 0.22, CI: 0.059 to 0.35, p = 0.008).
An earlier eruption of the primary teeth can be assumed with greater body weight and height at the time of birth for girls. For boys, the tendency is the opposite. However, there seems to be a catch-up growth effect due to the missing differences between both permanent tooth eruption times. Nevertheless, the first primary and the first permanent tooth eruption correlates in a German children population.
本研究的目的是根据性别确定德国儿童中乳牙和恒牙萌出与新生儿因素之间的可能关系。
在 10 家德国正畸诊所进行了横断面调查研究。使用问卷收集了 405 名儿童（230 名女孩和 175 名男孩）的信息，包括性别、出生时间（孕周）、出生体重（克）和身高（厘米）以及第一颗乳牙和第一颗恒牙萌出时间（月/年）。采用曼-惠特尼 U 检验进行组间比较，采用皮尔逊检验验证相关性。
对于男性参与者，新生儿因素（出生时间、出生体重和出生身高）与乳牙萌出之间无相关性。然而，对于女性，第一颗乳牙萌出与出生体重（r=-0.18，CI：-0.30 至-0.042，p=0.011）和出生身高（r=-0.19，CI：-0.32 至-0.054，p=0.006）呈低度相关。对于男性和女性，新生儿因素与第一颗恒牙萌出之间均无相关性。第一颗乳牙和第一颗恒牙萌出之间存在中度相关性（女性：r=0.30，CI：0.16 至 0.43，p<0.001；男性：r=0.22，CI：0.059 至 0.35，p=0.008）。
对于女孩，出生时体重和身高较大，乳牙萌出时间可能较早。对于男孩，趋势相反。然而，由于两次恒牙萌出时间之间没有差异，似乎存在追赶生长效应。然而，在德国儿童人群中，第一颗乳牙和第一颗恒牙萌出存在相关性。
