下颌骨单侧前上牵引对大鼠颞下颌关节影响的电镜结果研究

Objective The purpose of this study is to make a model by anterior-superior displacement of the mandible in the rat temporomandibular joint. We also investigated the ultrastructure of the condyles and discs of the temoromandibular joint. Methods 24 Sprague-Dawley rats (3 months old) were subjected to traction of the mandibular ramus in the anterior-superior direction unilaterally using elastic force and 3 rats were used as the control. The operations were performed without surgical invasion of the TMJ capsule. The animals were killed and temporomandibular joint tissue was removed in 3, 7, 14, 28 days after operation. The condyles and discs were observed by scanning electron microscopy. Results In contrast to the group, it showed histopathology changes in microstructure. The change of the discs is more gentle and recoverable. The pathology changes of the condyle on the opposite side in light-force team were the most severely. Conclusion We built an animal model by drawing the mandibular ramus anterior-superior. This model can be used to study the remodeling of the TMJ in orthodontic unilateral traction.