Incidence and effect of an extra root on the crown morphometry of the maxillary second molars among Malaysian Mongoloids.

IF 1.2 4区医学 Q3 ANATOMY & MORPHOLOGY

Folia morphologica Pub Date : 2024-10-10 DOI:10.5603/fm.101502

Rasha Ibrahim Alghali, Phrabhakaran Nambiar, Wei Cheong Ngeow, Norliza Ibrahim, Muhammad Khan Asif, Abeer Saad Al-Mouallad

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引用次数: 0

Abstract

Background: This study aimed to investigate whether the presence of two palatal roots on permanent maxillary second molars (MSMs) can affect the crown size and crown's buccolingual and mesiodistal diameters.

Materials and methods: A retrospective study was conducted using 592 CBCT scans to investigate 1120 MSMs of Mongoloid Malaysians. 3D models were created to assess the four-rooted MSMs and other related teeth carefully. Crown size and crown's buccolingual and mesiodistal diameters were measured for the four-rooted MSM, the adjacent maxillary first molar (MFM), and their antimeres to investigate the effect of the presence of an extra root on the size and morphological features of the crown of these associated teeth.

Results: Only six out of the 1120 MSMs displayed four roots (0.53%). The incidence was 0.67% (2/298) for the Malay males and 0.4% (1/247) for the Malay females, with the Malay male having a bilateral occurrence of four-rooted MSM. The incidence was 0.34% (1/294) for the Chinese males, while 0.71% (2/281) was detected in Chinese females. Interestingly, the four-rooted MSMs showed a wider mesiodistal distance than their three-rooted antimeres in three out of four cases. The presence of two palatal roots may also increase the crown's buccolingual diameter.

Conclusions: The presence of anatomical variations and the dramatic change in crown measurements can be good indicators of the presence of extra roots, including in some of their related neighbours. This might help dentists to take precautionary measures when performing tooth extractions and endodontic therapy.

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马来西亚蒙古人上颌第二臼齿多根的发生率及其对牙冠形态的影响。

背景：本研究旨在探讨上颌第二恒磨牙（MSMs）上存在两个腭根是否会影响牙冠大小以及牙冠的颊舌侧和牙间侧直径：使用 592 次 CBCT 扫描对 1120 颗马来西亚蒙古人上颌第二磨牙进行了回顾性研究。创建了三维模型，以仔细评估四根MSM和其他相关牙齿。测量了四根MSM、相邻的上颌第一磨牙（MFM）及其反面的牙冠大小、牙冠的颊舌侧直径和牙冠中径，以研究额外牙根的存在对这些相关牙齿的牙冠大小和形态特征的影响：结果：1120颗MSM中只有6颗有四根牙根（0.53%）。马来男性的发病率为 0.67%（2/298），马来女性的发病率为 0.4%（1/247），其中马来男性的四根 MSM 出现在双侧。华裔男性的发病率为 0.34%（1/294），而华裔女性的发病率为 0.71%（2/281）。有趣的是，在四个病例中，有三个病例的四根MSM比三根MSM的中髁间距更宽。两个腭根的存在也可能会增加牙冠的颊舌直径：解剖变异的存在和牙冠测量值的急剧变化可以很好地说明牙根（包括一些相关邻根）的存在。这可能有助于牙医在拔牙和牙髓治疗时采取预防措施。

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

Folia morphologica ANATOMY & MORPHOLOGY-

CiteScore

2.40

自引率

0.00%

发文量

218

审稿时长

6-12 weeks

期刊介绍： "Folia Morphologica" is an official journal of the Polish Anatomical Society (a Constituent Member of European Federation for Experimental Morphology - EFEM). It contains original articles and reviews on morphology in the broadest sense (descriptive, experimental, and methodological). Papers dealing with practical application of morphological research to clinical problems may also be considered. Full-length papers as well as short research notes can be submitted. Descriptive papers dealing with non-mammals, cannot be accepted for publication with some exception.