A Radiological Study on the Bone Structures in the Functional Temporomandibular Joint

颞下颌关节（TMJ）X线片异常的评价取决于其骨结构形式的骨间和骨内差异。本研究的目的是阐明颞下颌关节对习惯性下颌运动的适应性骨变化，估计髁状突头生长期后外侧面的基本形态，并在选择性侧位断层片上观察颞下颌关节紊乱病（TMD）患者的颞下颌关节结构变化过程。用Sirognatho分析系统II对记录的患者咀嚼周期进行分析。结果表明：（1）颞下颌关节选择性侧位体层摄影常规X线检查时，未发现TMD患者髁状突头后关节面有扁平或凹陷。(2)159例患者的髁状突头有骨赘，其发生率约为30%， ...更多信息 放射学研究的年龄组。结果表明，TMD患者的年龄变化不单纯是一种增龄，而可能是一种适应性变化。(3)本文提出了一种多断面同步断层图像叠加技术，用于颞下颌关节的X线测量。随访结果表明，髁突头形态的改变与下颌骨的空间变化是相互影响的。也就是说，髁状突头的前上复位导致髁状突缩短。(4)将刚过生长期的患者髁状突头外侧分为6组。第一组，显著小而圆的组和第二组，细长的组被认为是由于在其生长期的下颌运动期间对TMJ的功能负荷而导致的发育异常。(5)对TMD患者咀嚼周期的分析不能反映髁突头的适应性变化与下颌运动之间的关系。功能性负荷需要进一步研究颌运动。少

An evaluation of abnormalities on radiograms of the temporomandibular joints (TMJs) depends on the inter-and intrasubjects differences in form of their bone structures. The aim of this radiologic study is to clarify the adaptive bone changes of the TMJs to habitual jaw movements, estimating the basic forms of the lateral aspects of the condylar heads just after the growth period of them and investigating a process of structural changes of the TMJs on the selective lateral tomograpms of the patients with temporomandibular joint disorders (TMD), and analyzing chewing cycles of the patients recorded by a Sirognatho Analyzing System II. The resutls were as follows ;(1) Flattening or a concavity was unexpectedly found on the posterior articular surface of the condylar heads of the patients with TMD by the selective lateral tomography as a routine radiographic examination of the TMJs.(2) With an incidence of about 30%, the concavity was found on the condylar head of 159 patients, even in eve … More ry age group on a radiological study. The result indicated that the concavity was not merely a aging, but probably an adaptive change in the patient with TMD.(3) A superimposing technique of simultaneous multisection tomograms was developed for the radiographic measurement of the TMJs. On a follow-up study, the technique proved that the change in shape of the condylar head and the spatial change of the mandible were interacted with each other. That is, antero-superior repositioning of the condylar head lead the condyle into the shortening.(4) Lateral aspects of the condylar head of the patients just after the growth period were classified into 6 groups. The first, significantly small and rounded group and the second, elongated group were considered to be a developmental anomaly due to the functional loading to the TMJs during jaw movements on their growth period.(5) Analysis of chewing cycles of TMD patients could not manifest the relationships between the adaptive changes of the condylar head and jaw movements. Further studies on jaw movements were required for the functional loading. Less