de Farias J F G, Melo S L S, Bento P M, Oliveira L S A F, Campos P S F, de Melo D P
1 Division of Oral Radiology, Department of Oral Diagnosis, State University of Paraíba, Campina Grande, Paraíba, Brazil.
2 Department of Oral Pathology, Radiology & Medicine, University of Iowa College of Dentistry, Iowa, IA, USA.
Dentomaxillofac Radiol. 2015;44(7):20150023. doi: 10.1259/dmfr.20150023. Epub 2015 Mar 25.
The aim was to evaluate the morphology of the temporomandibular joint's (TMJs) disc and condyle as well as its correlation with disc displacement, using MRI.
190 TMJs were retrospectively analysed. The condyle morphology of each TMJ was evaluated by two observers using both axial and coronal views, as were their disc morphology and displacement, using sagittal view. Condyle morphology was classified as flat, convex, angled or rounded in the coronal sections and as anterior side flat/posterior side convex, biconvex, anterior side concave/posterior side convex, flat or biconcave in the axial view. Disc morphology was determined as biconcave, biplanar, biconvex, hemiconvex or folded. χ2, Fisher exact and Bonferroni correction tests were used to evaluate the data. ANOVA followed by post hoc Tukey's test was used to evaluate the interaction between age and disc displacement.
Anterior disc displacement with reduction; convex condyle morphology in the coronal view; anterior side concave/posterior side convex morphology in the axial view; and biconcave discs were found to be the most prevalent findings. An association was observed between disc morphology and disc displacement (p<0.001). No correlation between condyle morphology and TMJ disc displacement was found (p=0.291 for axial and p=0.14 for coronal views).
The results of this study suggest that TMJ disc morphology is associated with disc displacement.
旨在使用磁共振成像（MRI）评估颞下颌关节（TMJ）盘和髁突的形态及其与盘移位的相关性。
对190个颞下颌关节进行回顾性分析。两名观察者使用轴向和冠状位视图评估每个颞下颌关节的髁突形态，使用矢状位视图评估其盘形态和移位情况。在冠状面中，髁突形态分为扁平、凸面、有角度或圆形；在轴位视图中，分为前侧扁平/后侧凸面、双凸面、前侧凹陷/后侧凸面、扁平或双凹面。盘形态确定为双凹面、双平面、双凸面、半凸面或折叠状。使用χ2检验、Fisher精确检验和Bonferroni校正检验来评估数据。采用方差分析（ANOVA）及事后Tukey检验来评估年龄与盘移位之间的相互作用。
发现最常见的情况是可复性盘前移位；冠状位视图中髁突呈凸面形态；轴位视图中前侧凹陷/后侧凸面形态；以及双凹形盘。观察到盘形态与盘移位之间存在关联（p<0.001）。未发现髁突形态与颞下颌关节盘移位之间存在相关性（轴位视图p=0.291，冠状位视图p=0.14）。
本研究结果表明，颞下颌关节盘形态与盘移位有关。
