Walker Timothy F, Broadwell Brian K, Noujeim Marcel E
a Department of Diagnostic Sciences , Creighton University School of Dentistry , Omaha , NE , USA.
b Department of Comprehensive Dentistry , University of Texas Health Science Center at San Antonio , San Antonio , TX , USA.
Cranio. 2017 Jan;35(1):10-14. doi: 10.1080/08869634.2015.1123844. Epub 2016 Mar 30.
The aim of this pilot study was to assess temporomandibular joint disc movement relative to the condyle among centric relation (CR), physiologic rest position (PRP), and maximal intercuspation position (MIP) in healthy patients without signs or symptoms of any temporomandibular disorder. The hypothesis was that as the condyle rotated clockwise or translated anteriorly, the disc would also move in an anterior direction.
Magnetic resonance images were obtained on 20 volunteers in CR, physiologic rest, and MIP. Three investigators measured the location of the disc among the different mandibular positions.
Disc location differences between CR and PRP exhibited the widest range of measurement. The largest amount of disc protrusion relative to the condyle was found between CR and PRP on the right side. The largest amount of disc retrusion relative to the condyle was found between CR and MIP on the right side. The hypothesis was not supported by the results.
According to the results of this pilot study, the direction of movement of the temporomandibular disc does not correlate with the rotational movement of the condyle in hinge positions.
Increased knowledge of temporomandibular disc movement among various mandibular positions in asymptomatic patients may help clinicians recognize deviations in symptomatic patients.
本初步研究旨在评估在无任何颞下颌关节紊乱体征或症状的健康患者中，颞下颌关节盘在正中关系（CR）、生理休息位（PRP）和最大牙尖交错位（MIP）时相对于髁突的运动情况。假设是随着髁突顺时针旋转或向前平移，关节盘也会向前移动。
对20名志愿者在CR位、生理休息位和MIP位进行磁共振成像检查。三名研究人员测量了关节盘在不同下颌位置的位置。
CR位和PRP位之间关节盘位置差异的测量范围最广。右侧CR位和PRP位之间发现关节盘相对于髁突的最大前突量。右侧CR位和MIP位之间发现关节盘相对于髁突的最大后缩量。结果不支持该假设。
根据本初步研究结果，颞下颌关节盘的运动方向与髁突在铰链位的旋转运动不相关。
增加对无症状患者不同下颌位置时颞下颌关节盘运动的了解，可能有助于临床医生识别有症状患者的偏差。
