›› 2021, Vol. 41 ›› Issue (12): 1094-1199.

• Clinical Research • Previous Articles     Next Articles

MRI Study of Type Ⅲ Fixed Magnetic Functional Appliance Effect on Temporalmandibular Joint

1,Yin Yinkang   

  • Received:2021-06-21 Revised:2021-08-07 Online:2021-12-28 Published:2021-12-31
  • Contact: Yin Yinkang E-mail:18987175659@qq.com

Abstract: [ABSTRACT] Objective: To study the remodeling of the temporomandibular joint after treatment with fixed magnetic functional appliance. Methods: Fifteen patients diagnosed with functional and bony Class III malocclusion by X-ray cephalometric analysis before treatment were treated with Class III fixed magnetic function appliance.Result: After orthopedic treatment: 1.The anterior space of the joint increases, the posterior space of it decreases, the joint space index decreases, and the position of the condyle process in the articular fossa is shifted backward; 2.The disc condyle angle and the anterior band disc condylar angle increase, the joint disc moves backward within the physiological range, and the change of the position of the anterior band of the joint disc is consistent with that of the position of its posterior band; 3.The angle of the condylar process head is increased, and the condyle process is flexed forwards; 4.There is no significant difference between the angle of the articular fossa posterior bevel and the angle of the articular fossa. Conclusion: Fixed magnetic functional appliance treatment can induce adaptive changes within the physiological range in TMJ in patients with type-Ⅲ malocclusion during the growing period. After correction using fixed magnetic functional appliance the posterior condylar process is displaced backwards, the articular disc is displaced forwards, and the thickness of the bilaminar area is reduced. The condylar process head is flexed forward.

Key words: Temporomandibular joint, Class Ⅲ functional orthopedic treatment, magnetic

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