翼外肌在髁突矢状骨折愈合过程中对髁突形态改建的影响

目的：本实验的目的是检查翼外肌在髁突矢状骨折愈合过程中,对髁突形态改建的影响。方法：20只1岁龄成年绵羊,随机分为两组,每组10只动物,所有绵羊都用超声骨刀造成髁突矢状骨折,剪断关节盘前后附着并将其推向内侧,其中组1动物切断翼外肌,组2动物保留翼外肌功能。每组动物分别在术后4周（各2只）、12周（各4只）、24周（各4只）处死。处死后行CT检查,CT三维重建观察髁突形态,并解剖颞颌关节（TMJ）以观察髁突形态。结果：组2即保留翼外肌功能组,较组1髁突有更多新骨形成,髁突形态改变更严重。结论：翼外肌在髁突矢状骨折愈合过程中对髁突形态改建的影响起非常重要的作用。

Role of the Lateral Pterygoid Muscle in the Sagittal Fracture of Mandibular Condyle (SFMC) Healing Process

Objective： To examine the effect of the lateral peterygoid muscle in the reconstruct the condylar shape during the sagittal fracture of mandibular condyle （SFMC） healing process. Methods： Twenty--four adult sheep were divided into 2 groups. All sheep had a unilateral operation on the right side of cuting anterior and posterior at- tachments of the the discs, and an oblique vertical osteotomy was made from the lateral pole of the condyle to the medial side of the condylar neck. One group （group1） of twelve sheep＇s lateral pterygoid muscle were cut. The other group （group2） weren＇t cut the lateral pterygoid muscle. Each group sheep was sacrificed at 4 weeks （2 sheep）, 12 weeks （4 sheep）, and 24 weeks （4 sheep） after surgery. Computed tomograms （CT） were taken after sacrificed, and the three--dimensional compute tomographic reconstruction was used to observe condylar shape. Results： In the group without cut the lateral peterygoid muscle, the joints showed greater overgrows of new bone and more ad- vanced ankylosis. Conclusion： This study shows that the lateral pterygoid muscle plays an important part in recon- structing the condylar shape during the sagittal fracture of mandibular condyle （SFMC） healing process.