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  • Title: [Magnetic resonance imaging in the assessment of the temporomandibular joint structure following mandibular advancement].
    Author: Shi JJ, Zeng XL.
    Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2007 Nov; 42(11):665-8. PubMed ID: 18307923.
    Abstract:
    OBJECTIVE: To investigate the changes in the disc-condyle-fossa relationship following mandibular advancement. METHODS: Twenty-five patients (10 boys and 15 girls, 11.1 +/- 1.1 years) with class II division 1 malocclusions were treated with Activator. The average treatment time was 10.9 months. Parasagittal MRIs in closed mouth position were analyzed before and after Activator treatment by means of the pair-t test. RESULTS: Ca-Tm value [(-0.1 +/- 1.5) mm and (-0.6 +/- 0.9) mm] of the left temporomandibular joint (TMJ) and Ca-Ca' value [(2.3 +/- 0.8) mm and (1.8 +/- 0.5) mm] of the right TMJ were changed significantly after Activator treatment (P < 0.05). This indicated that the condyle was located anteriorly in the fossa. No significant changes were found in the disc-fossa relationship and disc-condyle relationship (P > 0.05). CONCLUSIONS: Activator could promote the growth of the mandible and at the same time, it had no apparent negative influence on TMJ function.
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