Relationships among apical surface area, impaction level, and age in impacted mandibular third molars: a CBCT study.

IF 1.7 3区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Oral Radiology Pub Date : 2025-10-07 DOI:10.1007/s11282-025-00868-5

Ghassan Ali Abbas, Rabiah Al-Adawiyah Rahmat, Amir Hazwan Abdul Rahim, Meghna Gohain, Arofi Kurniawan, Mariam Abdullah, Zuraiza Mohamad Zaini, Norliza Ibrahim

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引用次数: 0

Abstract

Objectives: This study investigated the association between the apical surface area measurement (ASAM) of impacted mandibular third molars (IMTM) and chronological age at varying impaction levels, as well as ASAM differences among levels.

Methods: A total of 446 IMTM (227 right, 219 left) from 257 Malaysian patients aged 15.0 to 25.9 years were included and grouped into 0.9-year intervals. All CBCT images were analysed using Mimics and 3-matic software (Materialise NV, Belgium, version 21.0) to calculate the apical surface area. Impaction level was categorised according to the Pell and Gregory classification system. Spearman's correlation and Welch's ANOVA were conducted to assess the relationship between ASAM and age and to compare ASAM across the four levels (A, B, modified B/C, and C). Differences between left and right IMTM were assessed using an independent t-test, and analysed with SPSS (version 26).

Result: ASAM showed an inverse correlation with age (ρ = -0.89, ρ² = 0.79), with a median of 4.86 mm² (IQR: 2.35-11.92). The steepest decline was observed between 17-18 years, followed by a plateau from 21 years onwards. Left and right IMTM were not statistically different (p = 0.53) and subsequently pooled. ASAM increased with impaction depth; however, only level C exhibited significantly larger ASAM than levels A and B (p < 0.001), with an effect size of ω² = 0.13, indicating a notable delay in maturation.

Conclusions: This study demonstrates the relationship between ASAM in IMTM and age, with potential applicability in dental age estimation. However, caution is advised for level C impactions, as the estimated age may be biased.

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下颌阻生第三磨牙根尖表面积、嵌塞水平和年龄的关系：一项CBCT研究。

目的：研究不同阻生水平下颌第三磨牙（IMTM）的牙尖表面积测量（ASAM）与实足年龄的关系，以及不同阻生水平间ASAM的差异。方法：选取257例马来西亚患者，年龄15.0 ~ 25.9岁，共446例IMTM（右侧227例，左侧219例），每隔0.9年进行分组。使用Mimics和3-matic软件（Materialise NV, Belgium, version 21.0）分析所有CBCT图像，计算根尖表面积。根据Pell和Gregory分类系统对影响程度进行分类。采用Spearman相关分析和Welch方差分析来评估ASAM与年龄之间的关系，并在四个水平（A、B、修正B/C和C）上比较ASAM。使用独立t检验评估左右IMTM的差异，并使用SPSS （version 26）进行分析。结果：ASAM与年龄呈负相关（ρ = -0.89, ρ2 = 0.79），中位数为4.86 mm2 （IQR: 2.35 ~ 11.92）。在17-18岁之间观察到最急剧的下降，随后是21岁以后的平稳期。左、右IMTM无统计学差异（p = 0.53）并合并。ASAM随撞击深度增加而增加；然而，只有C水平表现出比A和B水平更大的ASAM (p 2 = 0.13)，表明成熟明显延迟。结论：本研究证实了IMTM中ASAM与年龄的关系，在牙龄估计中具有潜在的适用性。然而，对于C级撞击，建议谨慎，因为估计的年龄可能有偏差。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oral Radiology DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.20

自引率

13.60%

发文量

审稿时长

>12 weeks

期刊介绍： As the official English-language journal of the Japanese Society for Oral and Maxillofacial Radiology and the Asian Academy of Oral and Maxillofacial Radiology, Oral Radiology is intended to be a forum for international collaboration in head and neck diagnostic imaging and all related fields. Oral Radiology features cutting-edge research papers, review articles, case reports, and technical notes from both the clinical and experimental fields. As membership in the Society is not a prerequisite, contributions are welcome from researchers and clinicians worldwide.