Padala Soumya, Padmanabhan Sridevi, Chithranjan Arun B
Division of Orthodontics, The Ohio State University, Columbus, Ohio, USA.
Indian J Dent Res. 2012 Jan-Feb;23(1):122. doi: 10.4103/0970-9290.99060.
The etiopathogenesis of temporomandibular joint (TMJ) disorders has been attributed to multiple factors and, while the importance of centric relation (CR) has been acknowledged in dental literature, the role of condylar position and CR-CO (CO-centric occlusion) discrepancy in TMJ dysfunction (TMD) has been a source of controversy.
To establish the relationship between condyle position and TMD.
This was a case-control study to evaluate condylar displacement and interarch CR-CO discrepancy in symptomatic subjects (with TMD) and compare them with asymptomatic subjects.
Forty subjects were screened for TMD based on Helkimo index and grouped into asymptomatic and symptomatic groups. CR was registered using the modified Roth power centric bite registration after neuromuscular deprogramming. Models thus mounted on an Advanced Dental Design (AD2) articulator were evaluated for interarch CR-CO discrepancy. The condylar position discrepancy was recorded on a device MCD (measured condylar deviation).
The Student's t test was used to test statistical significance. The paired t test and the unpaired t test were used for comparing results within and between the groups. Pearson correlation coefficient was used to find out the correlation between MCD measurements and dental three-dimensional (3D) model analysis measurements. The Chi-square test was used to evaluate the qualitative data.
The average vertical and horizontal condylar displacements were significantly greater in the symptomatic group than in the asymptomatic group. There were significant deviations at the level of the occlusion in both groups.
Condyle position may play a significant role in the etiopathogenesis of TMJ disorders.
颞下颌关节（TMJ）紊乱病的病因病机归因于多种因素，虽然正中关系（CR）在牙科文献中的重要性已得到认可，但髁突位置及CR-CO（正中咬合）差异在颞下颌关节功能紊乱（TMD）中的作用一直存在争议。
确定髁突位置与TMD之间的关系。
这是一项病例对照研究，旨在评估有症状受试者（患有TMD）的髁突移位和牙弓间CR-CO差异，并将其与无症状受试者进行比较。
根据赫尔基莫指数对40名受试者进行TMD筛查，并分为无症状组和有症状组。在进行神经肌肉去程序化后，使用改良的罗斯力量正中咬合记录法记录CR。将由此安装在高级牙科设计（AD2）牙合架上的模型评估牙弓间CR-CO差异。在一种装置MCD（测量髁突偏差）上记录髁突位置差异。
采用学生t检验来检验统计学显著性。配对t检验和非配对t检验用于比较组内和组间的结果。皮尔逊相关系数用于找出MCD测量值与牙科三维（3D）模型分析测量值之间的相关性。卡方检验用于评估定性数据。
有症状组的髁突垂直和水平平均移位明显大于无症状组。两组在咬合水平均存在明显偏差。
髁突位置可能在TMJ紊乱病的病因病机中起重要作用。
