TMJ degeneration caused by gradually induced disturbed occlusion: A scanning electron microscopy study
- VernacularTitle:渐进性咬合紊乱对恒河猴颞下颌关节影响的扫描电镜观察
- Author:
Meiqing WANG
;
Fang YUAN
;
Chaoyun YAN
- Publication Type:Journal Article
- Keywords:
Temporomandibular joint;
Dental occlusion;
Animal experiment
- From:
Journal of Practical Stomatology
2001;0(01):-
- CountryChina
- Language:Chinese
-
Abstract:
砄bjectire: To investigate whether the disturbed occlusion can induce TMJ degeneration. Methods: 2 Rhesus female monkeys, 1 served as experimental animal and the other as the control, were included. Right mandibular first molar and left maxillary first molar of the experimental animal were extracted. Small strings were set at the missing space to pull the neighbor teeth inclined into the space and to occlude with opposite teeth in convex to convex relation. 8 months later condyles and discs of both animals were surgically obtained and prepared for scanning electron microscopy examination. Results: Gelatin like material was found over the condyle and disc surface of the control animal and obvious rigids were found on its articular surface. On the sagittal section of the condyle cells arranged in lines of each of the three layers of the soft tissue were observed. But on the top of the condyle surface of the experimental animal there was an area from media anterior to lateral posterior where the gelatin like material twisted or even disappeared here and there. There was an area where fibers were exposed. The soft tissue layers were thinner and the cellular layer was discontinued locally. The waves on the surface of middle and posterior part of the disc were disturbed and fossae like changes were found on the inferior surface. Conclusion: TMJ degeneration can be produced by gradually induced occlusal disturbance.
