The Effects of Skeletal Class III Malocclusion Treatment with Chincup on the Function of Temporomandibular Joint A Clinical Trial

Abstract

Background &Aim: This research aimed to evaluate the effects of the chin cup used in the treatment of skeletal class III malocclusion with mandibular prognathism on the function of temporomandibular joints (TMJ)

Methods & Material: Twenty-five patients (mean age 6.11±0.76) with mandibular prognathsim were treated with occipital chincup and banded occlusal bite block. Temporomandibular joints were evaluated before and after treatment, using the Research Diagnostic Criteria for Temporomandibular Disorders RDC/TMD. Descriptive statistics, McNemar test, and Wilcoxon Singed-Rank test were used to detect changes resulting from the treatment in study group.

Results: Seven patients (28%) showed signs and symptoms of temporomandibular disorders, the difference was statistically significant (p= 016), five of them (20%) had masticatorial muscles pain, while two subjects suffered from arthralgia.

The findings showed significant increasing in the pain of masticatorial muscles (4.69 ± 4.29) (P<0.01), and less significant increasing (1.65 ± 1.71) (P<0.041) in the painful temporomandibular joints.

Conclusions: Chincup therapy caused dysfunction in temporomandibular joints. Myofacial pain was the most disorder Accompanying with it.