Assessment of occlusal appliance in repositioning of the temporomandibular joint anterior disc displacement with reduction: a 3 to 36 months follow-up

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Abstract

Rationale: Occlusal appliance is one of methods for temporomandibular joint anterior disc displacement with reduction (ADDWR). However, most studies have focused on the symptom reliefs rather than the disc-condyle positional relationship. Aim: To evaluate the success rate and the prognosis of occlusal appliances in repositioning of the disc in temporomandibular joint ADDWR. Materials and methods: One hundred and forty four (144) patients (210 joints) diagnosed with temporomandibular joint ADDWR based on magnetic resonance imaging (MRI) were consecutively included in our study. For all joints it was confirmed by MRI that the disc could be recaptured in a mandible anterior position. Occlusal appliances, including anterior repositioning appliance, twinblock or Herbst, were worn to keep the mandible in this position. MRI scanning was carried out before, 6 months later, at the end of treatment and at the follow-up visit. Logistic regression was used to analyze the risk factors for success. Cox regression model was applied to estimate the prospective risk of failure. Results: Among the occlusal appliances used, there were 100 anterior repositioning appliances, 23 twin-blocks, and 21 Herbst, with mean treatment duration of 9.5 ± 2.6 months. One hundred and seventy seven (177) joints (84.3%) were successfully repositioned at the end of splint treatment, according to MRI. Logistic regression showed that the appliance types were significantly associated with the success rate. At 2 years of regular follow-up, in almost 53% of the cases the disc-condyle relationship was normal. Gender, age, treatment duration and orthodontics were identified in the final Cox regression model with hazard ratios of 1.375, 1.141, 0.396 and 0.364 respectively. Conclusion: Occlusal appliance is one of the useful methods to recapture the disc in patients with temporomandibular joint ADDWR. However, the patient selection should be rigorous. 

About the authors

Ch. Yang

Shanghai Jiao Tong University School of Medicine

Author for correspondence.
Email: fake@neicon.ru

Yang Chi – DDS, MD, Professor, Head of Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology

Dr. Chi Yang: Department of Oral and Maxillofacial Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; 639 Zhi Zao Ju Road, Shanghai, 200011, Peoples' Republic of China. Tel.: +86 21 23271699 5218; +86 21 23271699 5705.

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P. Shen

Shanghai Jiao Tong University School of Medicine

Email: fake@neicon.ru
Shen Pei – DDS, Attending, Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology Китай

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