The short- and long-term effects of congenital occlusion loss of the unilateral first permanent molar on the temporomandibular joint morphology and position: A retrospective study based on cone-beam computed tomography

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2024-03-21 DOI:10.1111/ocr.12780

Ting Li, Sisi Peng, Yuhan Zhao, Jianping Zhou, Hongwei Dai, Yan Wu

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Abstract

Objective

To investigate the effects of congenital unilateral first permanent molar occlusal loss (CUMOL) on the morphology and position of temporomandibular joint (TMJ).

Materials and Methods

Cone-beam computed tomography (CBCT) images of 37 patients with CUMOL (18 males and 19 females, mean age: 13.60 ± 4.38 years) were divided into two subgroups according to the status of second molar (G1: the second molar not erupted, n = 18, G2: second molar erupted, n = 19). The control group consisted of 33 normal occlusion patients (9 males and 24 females, mean age: 16.15 ± 5.44 years) and was divided into 2 subgroups accordingly (G3: the second molar had not erupted, n = 18, G4: the second molar had erupted and made contact with the opposing tooth, n = 15). Linear and angular measurements were used to determine the characteristics of TMJ.

Results

In G1, the condyle on the side of the CUMOL shifts posteriorly, with significant side differences observed in Anterior space (AS, P < .05) and Posterior space (PS, P < .05). However, with the eruption of the second permanent molars, in G2, the condyle on the CUMOL side moves posteriorly and inferiorly. This results in significant lateral differences in the AS (P < .05), PS (P < .05), and Superior space (SS, P < .05). Additionally, there is an increase in the thickness of the roof of the glenoid fossa (TRF) on the CUMOL side (P < .05), and a decrease in the inclination of the bilateral articular eminences (P < .05).

Conclusions

CUMOL can affect the position and the morphology of the condyle and was associated with the eruption of the second permanent molars. Before the eruption of the second permanent molars, CUMOL primarily affects the position of the condyle. After the emergence of the second permanent molars, CUMOL leads to changes in both the condyle's position and the morphology of the glenoid fossa.

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单侧第一恒磨牙先天性咬合缺失对颞下颌关节形态和位置的短期和长期影响：基于锥形束计算机断层扫描的回顾性研究。

目的：研究先天性单侧第一恒磨牙咬合缺失（CUMOL）对颞下颌关节（TMJ）形态和位置的影响：研究先天性单侧第一恒磨牙咬合缺失（CUMOL）对颞下颌关节（TMJ）形态和位置的影响：将37名CUMOL患者（男18名，女19名，平均年龄（13.60 ± 4.38）岁）的锥形束计算机断层扫描（CBCT）图像按照第二磨牙的状态分为两组（G1：第二磨牙未萌出，n = 18；G2：第二磨牙萌出，n = 19）。对照组包括 33 名咬合正常的患者（9 男 24 女，平均年龄：16.15 ± 5.44 岁），并相应分为两个亚组（G3：第二磨牙未萌出，n = 18；G4：第二磨牙已萌出并与对侧牙接触，n = 15）。通过线性和角度测量来确定颞下颌关节的特征：结果：在 G1 中，CUMOL 一侧的髁突向后移动，在前间隙（AS，P 结论：CUMOL 会影响颞下颌关节的位置和角度：CUMOL会影响髁突的位置和形态，并与第二恒磨牙的萌出有关。在第二恒磨牙萌出前，CUMOL 主要影响髁突的位置。第二恒磨牙萌出后，CUMOL会导致髁突的位置和盂窝的形态发生变化。

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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