Ben Amor F, Carpentier P, Foucart J M, Meunier A
Department of Oral Anatomy, Faculty of Dental Medicine, Monastir, Tunisia.
J Oral Maxillofac Surg. 1998 Oct;56(10):1164-7; discussion 1168-9. doi: 10.1016/s0278-2391(98)90763-7.
This study measured the strength to failure of the human temporomandibular joint (TMJ) lateral disc attachment (LDA) using a tension-compression machine. These data were correlated with the LDA location and its morphologic aspects, the age and sex of the subjects, and the amount of the lateral pterygoid muscle (LPM) inserted in the disc.
Forty-two TMJs without any obvious internal damage were carefully dissected to preserve the LDA. The width of insertion of the lateral pterygoid muscle fibers in the anterior band, as well as the width of the disc, were measured. The tension test was performed until the complete failure of the sample using a screw machine.
Two types of LDA were recognized. In LDA 1, the anterior and posterior bands lateral disc junction were directly inserted on the lateral pole, whereas in LDA 2 this lateral junction was attached behind and below the pole through a sheet of fibrous tissue. The breaking points for LDA 1 (55.8 N) and LDA 2 (28.8 N) were significantly different (P = .03). No correlation was found between the amount of LPM discal fibers insertion, sex, age, or the LDA breaking strength point.
The LDA 2 insertion strongly suggests that the lateral joint ligament together with the capsule may act as a substitute for the original disc attachment to the lateral pole of the condyle.
本研究使用拉伸-压缩试验机测量了人类颞下颌关节（TMJ）外侧盘附着（LDA）的破坏强度。这些数据与LDA的位置及其形态学特征、受试者的年龄和性别，以及插入盘内的翼外肌（LPM）的量相关。
仔细解剖42个无明显内部损伤的颞下颌关节以保留LDA。测量翼外肌纤维在前带的插入宽度以及盘的宽度。使用螺旋试验机进行拉伸试验，直至样本完全破坏。
识别出两种类型的LDA。在LDA 1中，外侧盘的前后带交界处直接插入外侧髁突，而在LDA 2中，该外侧交界处通过一片纤维组织附着在髁突后方和下方。LDA 1（55.8 N）和LDA 2（28.8 N）的断裂点有显著差异（P = .03）。未发现LPM盘纤维插入量、性别、年龄或LDA断裂强度点之间存在相关性。
LDA 2的插入强烈表明外侧关节韧带与关节囊可能替代了盘与髁突外侧髁突的原始附着。
