应用锥形束CT 测量牙体积推断四川汉族女性成人年龄

doi:10.12337/zgkqzzxzz.2019.03.002

摘要/Abstract

摘要： 目的： 应用锥形束CT(Cone-beam computed tomography,CBCT)测量不同成人的牙齿体积大小,用于四川汉族女性成人年龄的推断,探索牙体积变化在年龄推断中的应用价值。方法： 收集149例年龄范围在20~60岁的四川汉族女性口腔CBCT影像片,通过Mimics17.0软件测量左上颌中切牙的牙髓腔体积(X1)和牙本质体积(X2),并计算牙总体积(X3)作为测量指标。采用Pearson相关性分析对各测量指标与年龄间的相关性进行分析。从总体样本中随机抽取16例样本作为模型的验证样本,剩余133例样本用于建立女性成人年龄推断的回归方程。结果： Pearson相关性分析结果显示,只有牙髓腔体积(X1)与年龄间存在显著的负相关性(r=-0.666,P< 0.001),牙本质体积(X2)和牙总体积(X3)与年龄间相关性不明显(P> 0.05)。模型验证结果显示,利用牙髓腔体积(X1)建立的年龄推断回归模型的平均绝对误差(MAE)为7.723岁。结论： 应用CBCT观察左上颌中切牙牙髓腔的体积变化,可用于四川汉族女性成人年龄推断,为我国法医学鉴定实践中成人年龄推断提供了新方法,

关键词: 法医牙科学, 法医影像学, 年龄推断, 左上颌中切牙, 锥形束CT

Abstract: Objective： Cone-beam computed tomography was used to analyze the tooth volume of different adults in order to estimate the age of females of Han nationality in Sichuan, and to explore the application value of tooth volume change in age estimation. Methods： CBCT images of 149 Han females aged 20 to 60 in Sichuan were collected. The pulp cavity volume (X1) and dentin volume(X2) of left maxillary central incisors were measured by Mimics 17.0 software, and the total tooth volume(X3) was calculated as the mea- surement index. Pearson correlation analysis was used to analyze the correlation between each measure- ment index and chronological age. Sixteen samples were randomly selected from the total sample as vali- dation samples, and the remaining 133 samples were used to develop regression equation for female adult age estimation. Results： Pearson correlation analysis showed that only pulp cavity volume(X1) was nega- tively correlated with chronological age(r=-0.666, P<0.001). Dentin volume(X2) and total tooth volume (X3) were not significantly correlated with chronological age(P>0.05). The results of model validation showed that the mean absolute error(MAE) of regression model based on pulp cavity volume(X1) was 7.723 year. Conclusion： CBCT can be used to observe the pulp cavity volume changes of left maxillary central incisors, which can be used to estimate the age of females adult of Han nationality in Sichuan, and provide a new method for the age estimation of adults in forensic practice in China.

Key words: forensic dentistry, forensic imaging, age estimation, left maxillary central incisors, CBCT

中图分类号:

R782

王亮,占梦军,赵家龙,等. 应用锥形束CT 测量牙体积推断四川汉族女性成人年龄[J]. 中国口腔种植学杂志, 2019, 24(1): 5-9. DOI: 10.12337/zgkqzzxzz.2019.03.002

WANG Liang, ZHAN Mengjun, ZHAO Jialong, et al. Age estimation in Sichuan Han female adults based on tooth volume analysis using cone-beam computed tomography[J].Chinese Journal of Oral Implantology, 2019, 24(1): 5-9.DOI: 10.12337/zgkqzzxzz.2019.03.002.

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