Correlation between growth situation of mandibular second molar and age among teenagers in Chongqing

Chen Ying; Feng Gang; Zhong Yajing; Dai Hongwei

doi:10.13406/j.cnki.cyxb.000925

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Correlation between growth situation of mandibular second molar and age among teenagers in Chongqing

更新时间：2024-01-17

- Correlation between growth situation of mandibular second molar and age among teenagers in Chongqing
- Journal of Chongqing Medical University Vol. 42, Issue 9, Pages: 1090-1094(2017)
- 作者机构：
  
  重庆医科大学附属口腔医院正畸科
- 作者简介：
- 基金信息：
- DOI：10.13406/j.cnki.cyxb.000925
  CLC： R783.5
- Published：2017，
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Chen Ying, Feng Gang, Zhong Yajing, et al. Correlation between growth situation of mandibular second molar and age among teenagers in Chongqing. [J]. Journal of Chongqing Medical University 42(9):1090-1094(2017)
DOI：

Chen Ying, Feng Gang, Zhong Yajing, et al. Correlation between growth situation of mandibular second molar and age among teenagers in Chongqing. [J]. Journal of Chongqing Medical University 42(9):1090-1094(2017) DOI： 10.13406/j.cnki.cyxb.000925.

摘要

目的:研究重庆地区青少年下颌第二磨牙（mandibular second molars

Msm）生长情况与个体年龄的相关性。方法:选取我院正畸科门诊的357例青少年病人

通过锥形束断层扫描（cone beam computed tomography

CBCT）视图精确测量Msm牙根长、牙冠长和宽

分别计算三者相关比值。对Msm相关长度指标与年龄的关系进行Pearson相关分析

根据相关性分析结果选取适宜参数拟合年龄推导的数学方程式

并对其年龄判别的准确性进行验证。结果:在各组别中Pearson相关性分析表明Msm的根长和年龄呈正相关(r

男性

=0.659

P=0.000;r

女性

=0.572

P=0.000

总体

=0.608

P=0.000)

根长/冠宽和年龄呈正相关(r

男性

=0.580

P=0.000;r

女性

=0.551

P=0.000

总体

=0.543

P=0.000)

冠长/根长和年龄呈负相关(r

男性

=-0.497

P=0.000;r

女性

=-0.448

P=0.000

总体

=-0.470

P=0.000)。年龄（Y）和Msm根长（X

）、根长/冠宽（X

）、冠长/根长（X

）的相关方程为:Y

男性

=4.165+0.341X

+2.151X

+0.882X

（P=0.000

=0.547）;Y

女性

=5.057+0.255X

+2.938X

-0.160X

（P=0.000

=0.466）;Y

总体

=4.918+0.285X

+2.521X

+0.240X

（P=0.000

=0.499）。在男性、女性及总体样本中

该方法评估生理年龄的相对误差分别为5.00%、5.90%和5.46%。结论:重庆地区青少年Msm与年龄具有一定相关性

采用相关指标拟合数学方程式评判生理年龄为青少年生长发育水平评估方法的研究提供了新的思路。

Abstract

Objective:To investigate the correlation between growth and development situation of mandibular second molar and individual biological age among male and female teenagers in Chongqing. Methods:The study subjects are consisted of 357 teenagers in the Department of Orthodontics in Stomatological Hospital of Chongqing Medical University. The root length（RL）

crown width（CW）and length（CL） of mandibular second molars（Msm） were measured by cone beam computed tomography（CBCT）

and the specific values related to above parameters were calculated. The Pearson correlation was applied to analyze the above values of the third molar and age

and the paremeters with high relevance were selected to establish equations for the use of age assessment with accuracy verification test. Results:The Pearson correlation coefficient revealed significant relationships between RL

RL/CW and CL/RL of Msm and chronological age of the three groups(For RL

male

=0.659

P=0.000;r

female

=0.572

P=0.000;r

all

=0.608

P=0.000. For RL/CW

male

=0.580

P=0.000;r

female

=551

P=0.000;r

all

=0.543

P=0.000. For CL/RL

male

=-0.497

P=0.000;r

female

=-0.448

P=0.000;r

all

=-0.470

P=0.000)

Furthermore

the linear regression equations between age（Y）and RL（X

）

RL/CW（X

）and CL/RL（X

）were established as follows:Y

MALE

=4.165+0.341X

+2.151X

+0.882X

（P=0.000

=0.547）;Y

FEMALE

=5.057+0.255X

+2.938X

-0.160X

（P=0.000

=0.466）;Y

ALL

=4.918+0.285X

+2.521X

+0.240X

（P=0.000

=0.499）. The relative errors of age assessment using those regression equations in male

female and both groups were 5.00%

5.90% and 5.46% respectively. Conclusion:There is significant relevance between growth and development situation of mandibular second molar and individual biological age among male and female teenagers in Chongqing. Taking those parameters as indicators to establish equations provide a novel idead for the research of age assessment.

关键词

下颌第二磨牙青少年年龄

Keywords

mandibular second molarteenagersage

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