摘要

目的：比较锥形束CT（CBCT）和全景片（OPG）在卡拉奇部分人群下颌第三磨牙牙根髓腔可见度（RPV）、牙周膜可见度（PLV）及牙冠指数（TCI）影像学评估中的差异。研究设计：分析性横断面研究。地点与时间：巴基斯坦卡拉奇Ziauddin大学医院正畸科，2022年10月至2023年。方法：评估18-40岁个体50颗下颌第三磨牙的数字全景片和CBCT图像。使用既定分期标准评估RPV和PLV，使用标准化方法计算TCI。数据采用SPSS 24版分析，使用卡方检验、Mann-Whitney U检验和简单线性回归，P<0.05视为显著。结果：两种成像模态在评估RPV和PLV时存在统计学显著差异（p<0.001）。TCI的评估也存在显著差异。简单线性回归分析显示，对于经OPG评估的下颌第三磨牙，年龄每增加1岁，TCI减少0.492个单位（p<0.001）。结论：利用下颌第三磨牙的影像学PLV和RPV可作为判断受试者是否为青少年的潜在标志物。相比之下，基于CBCT的TCI在该部分人群中用于估算实际年龄似乎不可靠。关键词：年龄估计，牙周膜，牙髓，X线片，下颌第三磨牙，成人，法医牙科。

原文摘要

OBJECTIVE: To compare cone-beam computed tomography (CBCT) and orthopantomography (OPG) for the radiographic assessment of root pulp visibility (RPV), periodontal ligament visibility (PLV), and the tooth coronal index (TCI) of mandibular third molars in a subset of the Karachi population.

STUDY DESIGN: An analytical cross-sectional study design. Place and Duration of the Study: Department of Orthodontics, Ziauddin University Hospital, Karachi, Pakistan, from October 2022 to 2023.

METHODOLOGY: Digital OPGs and CBCTs of 50 mandibular third molars from individuals aged 18-40 years were evaluated. RPV and PLV were assessed using established staging criteria, and the TCI was calculated using a standardised method. Data were analysed with SPSS version 24, employing the chi-square test, the Mann-Whitney U test, and Simple linear regression. A p-value of <0.05 was considered significant.

RESULTS: Comparison of teeth between the two imaging modalities for the assessment of RPV and PLV revealed a statistically significant difference (p <0.001). A statistically significant difference was found between the imaging modalities for TCI. Simple linear regression analysis indicated that, for mandibular third molars (assessed via OPG), each 1-year increase in age corresponds to a 0.492-unit decrease in TCI (p < 0.001).

CONCLUSION: The use of radiographic PLV and RPV of the mandibular third molar teeth is a potential marker of a subject's status as an adolescent. In contrast, the use of CBCT-based TCI appears to be an unreliable method for estimating chronological age in a subset of the Karachi population.

KEY WORDS: Age estimation, Periodontal ligament, Pulp, Radiographs, Mandibular third molar, Adult, Forensic dentistry.

出处

Journal of the College of Physicians and Surgeons--Pakistan 2026;36(7):853-858. DOI: 10.29271/jcpsp.2026.07.853.

PubMed 原文链接（PMID 42403120）

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