Tooth shape asymmetry in post-canine dentition: Evidence-based morphometric insights

Q1 Medicine

Journal of oral biology and craniofacial research Pub Date : 2025-04-19 DOI:10.1016/j.jobcr.2025.04.010

Srikant Natarajan , Junaid Ahmed , Shravan Shetty , Nidhin Philip Jose , Sharada Chowdappa , Sunita Carnelio

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引用次数: 0

Abstract

Background

This study investigates the potential existence of asymmetry in the shape of tooth and location of landmarks of tooth anatomy and its variation between sexes.

Methods

Our study evaluated dental symmetry in 160 patients aged 13–20 years, focusing on post-canine dentition. Using 3D geometric morphometrics, the research evaluated the variations in the anatomical landmarks between left and right side.

Results

Analysis of the landmarks revealed that 20–30 % of the principal components explained 80 % of the shape variation. No significant difference in centroid size was found between sexes, but significant shape differences were noted in all teeth except the 3-cusp type mandibular second premolar. Asymmetry was more in the premolar segment in the maxillary arch and in the two-cusp type of mandibular second premolar and the mandibular first molar in the mandibular arch.

Conclusion

The research underscores the evolutionary advantage of bilateral symmetry and the presence of fluctuating asymmetry, possibly linked to genetic or environmental stressors. It emphasizes the importance of understanding dental asymmetry for effective treatment planning and diagnosis, in restorative dentistry and orthodontics.

Abstract Image

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后犬齿列的牙齿形状不对称：基于证据的形态计量学见解

背景本研究调查了牙齿形状和牙齿解剖标志位置不对称的潜在存在及其性别差异。研究使用三维几何形态计量学评估了左右两侧解剖地标的差异。性别间的中心点大小无明显差异，但除下颌第二前臼齿为三尖牙外，其他牙齿的形状均存在明显差异。结论这项研究强调了双侧对称的进化优势，以及波动性不对称的存在，这可能与遗传或环境压力有关。它强调了了解牙齿不对称对有效的治疗计划和诊断、修复牙科和正畸的重要性。

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

Journal of oral biology and craniofacial research Medicine-Otorhinolaryngology

CiteScore

4.90

自引率

0.00%

发文量

133

审稿时长

167 days

期刊介绍： Journal of Oral Biology and Craniofacial Research (JOBCR)is the official journal of the Craniofacial Research Foundation (CRF). The journal aims to provide a common platform for both clinical and translational research and to promote interdisciplinary sciences in craniofacial region. JOBCR publishes content that includes diseases, injuries and defects in the head, neck, face, jaws and the hard and soft tissues of the mouth and jaws and face region; diagnosis and medical management of diseases specific to the orofacial tissues and of oral manifestations of systemic diseases; studies on identifying populations at risk of oral disease or in need of specific care, and comparing regional, environmental, social, and access similarities and differences in dental care between populations; diseases of the mouth and related structures like salivary glands, temporomandibular joints, facial muscles and perioral skin; biomedical engineering, tissue engineering and stem cells. The journal publishes reviews, commentaries, peer-reviewed original research articles, short communication, and case reports.