Department of Prosthetic Dentistry, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
J Oral Rehabil. 2009 Jun;36(6):435-41. doi: 10.1111/j.1365-2842.2009.01957.x. Epub 2009 May 5.
The presence of non-working occlusal contacts is often considered harmful for the temporomandibular joint. Thus, the purpose of this study was to investigate the effect of non-working occlusal contacts on the condylar position during submaximal and maximal clenching. The study comprised 22 healthy subjects having a canine-guided occlusion. None of them had a third molar and none of them had a missing tooth or showed tooth mobility. All subjects clenched on (i) the canine, (ii) the canine while a stiff bite registration material was positioned between the second premolar and the first molar on the non-working side. The clenching level was controlled by surface electromyography of the masseter muscle. During clenching, the vertical and horizontal condylar position was predicted using six degrees of freedom ultrasonic motion analyser. Clenching on the canine caused a cranial movement of the non-working side condyle. This movement was reduced by 0.6-0.9 mm when the subjects clenched while the artificial non-working side contacts were in place. These results indicate that the contacts on the non-working side may be able to prevent upward joint movement.
非工作咬合接触的存在通常被认为对颞下颌关节有害。因此，本研究旨在探讨非工作咬合接触在最大和最大咬牙时对髁突位置的影响。该研究包括 22 名具有尖牙引导咬合的健康受试者。他们中没有人有第三磨牙，也没有人有缺牙或牙齿松动。所有受试者均在（i）尖牙上进行咬合，（ii）尖牙上进行咬合，同时在非工作侧的第二前磨牙和第一磨牙之间放置硬咬记录材料。咬牙程度由咬肌表面肌电图控制。在咬牙过程中，使用六自由度超声运动分析器预测垂直和水平髁突位置。在尖牙上咬牙会导致非工作侧髁突的颅向运动。当受试者在人工非工作侧接触时咬牙时，这种运动减少了 0.6-0.9 毫米。这些结果表明，非工作侧的接触可能能够防止关节向上运动。
