Almaqrami Bushra Sufyan, Alhammadi Maged Sultan, Tang Bojun, ALyafrusee Enas Senan, Hua Fang, He Hong
Department of Orthodontics, Hubei-MOST KLOS & KLOBM, School & Hospital of Stomatology, Wuhan University, Wuhan, China.
Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Yemen.
J Oral Rehabil. 2021 Jun;48(6):666-677. doi: 10.1111/joor.13156. Epub 2021 Mar 2.
The purpose of this study was to three-dimensionally (3D) evaluate the morphological and positional features of the temporomandibular joint (TMJ) in adults with unilateral and bilateral posterior crossbite compared with aligned control subjects.
This cross-sectional comparative study analysed cone beam computed tomography (CBCT) images of 90 adult subjects' divided into three equal groups: bilateral posterior crossbite (BCG), unilateral posterior crossbite (UCG) and control group (CG). 3D measurements of the TMJ included the following: (a) position, angulation and inclination of the mandibular condyles; (b) centralisation of the condyles in their respective mandibular fossae; and (c) volumetric measurements of the TMJ spaces. Intra- and intergroup differences were identified using the paired Student's t test and an analysis of variance (ANOVA) followed by Tukey's post hoc test, respectively.
Regarding the intra-group side-based comparisons, there were significant differences in the anterior and superior joint spaces and the anteroposterior condylar joint position in the UCG. Intergroup comparisons revealed significant differences in the vertical condylar inclination, medial condylar position, condylar width and height, and volumetric joint space between the unaffected side of the UCG and left sides of the other groups. There were significant differences in the anteroposterior condylar inclination, medial condylar position, condylar width and height, anterior, posterior, superior and volumetric joint spaces, and anteroposterior condylar joint position between the crossbite side of the UCG and the right sides of the other groups.
Skeletal crossbite accompanied with characteristic morphological and positional TMJ features associated with unilateral posterior crossbite and are associated with side-specific TMJ asymmetry.
本研究的目的是对单侧和双侧后牙反合的成年人颞下颌关节（TMJ）的形态和位置特征进行三维（3D）评估，并与牙列整齐的对照受试者进行比较。
这项横断面比较研究分析了90名成年受试者的锥形束计算机断层扫描（CBCT）图像，这些受试者被分为三组，每组人数相等：双侧后牙反合组（BCG）、单侧后牙反合组（UCG）和对照组（CG）。TMJ的三维测量包括以下内容：（a）下颌髁突的位置、角度和倾斜度；（b）髁突在各自下颌窝中的中心化程度；（c）TMJ间隙的容积测量。分别使用配对t检验和方差分析（ANOVA）以及Tukey事后检验来确定组内和组间差异。
关于基于组内侧别的比较，UCG组的前、上关节间隙以及髁突前后关节位置存在显著差异。组间比较显示，UCG组未受影响侧与其他组左侧之间在髁突垂直倾斜度、内侧髁突位置、髁突宽度和高度以及关节间隙容积方面存在显著差异。UCG组反合侧与其他组右侧之间在髁突前后倾斜度、内侧髁突位置、髁突宽度和高度、前、后、上关节间隙和关节间隙容积以及髁突前后关节位置方面存在显著差异。
骨骼性反合伴有与单侧后牙反合相关的特征性TMJ形态和位置特征，并与特定侧别的TMJ不对称有关。
