法医学杂志

• 论著 •    

基于汉族成年人右侧第一磨牙口腔颌面CBCT髓室体积和牙本质指数推断年龄

丁艳杰(), 张宵, 施文利, 李子易, 王威, 张世林, 杨根杰, 郭阿几, 金波()   

  1. 川北医学院基础医学与法医学研究所,四川 南充 637000
  • 收稿日期:2023-07-16
  • 通讯作者: 金波
  • 作者简介:丁艳杰(1996—),男,硕士研究生,主要从事法医学研究;E-mail:yanjie.1996@qq.com
  • 基金资助:
    南充市学校科技战略合作专项(22SXQT0014);川北医学院校级科技发展基金青年项目(CBY21-QA15);四川省科技厅应用基础研究面上项目(2018JY0497)

Estimate the Age of Han Adult Based on the PCV and PDI of Right First Molar Using Oral and Maxillofacial CBCT

Yan-jie DING(), Xiao ZHANG, Wen-li SHI, Zi-yi LI, Wei WANG, Shi-lin ZHANG, Gen-jie YANG, A-ji GUO, Bo JIN()   

  1. Institute of Basic Medicine and Forensic Medicine, North Sichuan Medical College, Nanchong 637000, Sichuan Province, China
  • Received:2023-07-16
  • Contact: Bo JIN

摘要:

目的 基于口腔颌面锥形束计算机体层成像(cone beam computed tomography,CBCT)技术探索右侧第一磨牙髓室体积和髓室牙本质指数(pulp dentinal index,PDI)与实际年龄的相关性,构建便捷、准确的年龄推断模型。 方法 收集川北医学院附属医院口腔科1 857例汉族成年人CBCT影像资料(男性883例,女性974例),按照8∶2的比例分为训练集和验证集,1 485例训练集样本构建年龄推断模型,372例样本验证模型的准确性。运用Mimics 21.0软件测量右侧第一磨牙髓室体积、PDI,分析其与年龄的相关性及在不同性别、不同牙位之间的差异。 结果 第一磨牙髓室体积、PDI与实际年龄均呈强负相关(r值为0.82~0.89)。髓室体积、PDI在不同性别和不同牙位之间的差异具有统计学意义(P<0.05)。基于PDI构建的年龄推断模型优于髓室体积;基于右侧两颗第一磨牙PDI值构建的模型(y=73.72-44.15 x3-28.27 x4x3x4分别为右上颌第一磨牙、右下颌第一磨牙的PDI)最优,R2为0.79,平均绝对误差为4.90岁。 结论 第一磨牙髓室体积和PDI均是推断年龄的有效指标。基于PDI的年龄推断模型较基于髓室体积的模型更便捷、准确,能够为法医学实践中的年龄推断提供更有效的方法。

关键词: 法医人类学, 年龄推断, 锥形束计算机体层成像(CBCT), 第一磨牙, 髓室体积, 髓室牙本质指数, 汉族

Abstract:

Objective To explore the correlation between the actual age and the pulp chamber volume (PCV) and pulp dentinal index (PDI) of the right first molar based on Cone Beam Computed Tomography (CBCT) technology, and to construct a more accurate and convenient model for age estimation. Methods CBCT image data of 1 857 Han adults (883 males and 974 females) from the Department of Stomatology, Affiliated Hospital of North Sichuan Medical College were selected. The data were divided into training and validation sets at a ratio of 8∶2. A total of 1 485 training samples were used to construct the age inference model, and 372 samples were used to validate the accuracy of the model. The Mimics 21.0 software was used to measure the PCV and the PDI of the right first molar. Statistical analysis was conducted to determine their correlation with age, and their correlations with age and differences between different sexes and tooth positions were analyzed. Results The PCV and the PDI of the first molar showed a strong negative correlation with actual age (r values ranged from 0.82 to 0.89). The differences in PCV and PDI between different sexes and tooth positions were statistically significant (P<0.05).The age prediction model based on PDI was superior to that based on PCV. The model based on the PDI values of the two right first molars (y=73.72-44.15 x3-28.27 x4,where x3 and x4 are the PDI values of the right maxillary and mandibular first molars, respectively)was the best, with the R2 of 0.79 and an average absolute error of 4.90 years. Conclusion Both PCV and PDI of the first molar are effective indicators for age estimation. The age prediction model based on the PDI is more convenient and accurate than that based on the PCV, providing a more effective method for age estimation in forensic practice.

Key words: forensic anthropology, age estimation, cone beam computed tomography (CBCT), first molar, dental pulp chamber, pulp dentinal index, Han population

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