Study Of Condyle Movement Trace In Angle â…¡~2 Malocclusion

With development of orthodontics, the unity of outlook and function of stomatognathic system was concerned more and more. Angleâ…¡2 malocclusion is common. The typical clinical situation of Angleâ…¡2 can affect the function of stomatognathic system. Such as serious tooth abrasion, shorter of profile height, temporomandibular disorder (TMD), etc.Analysis of condyle movement trace is one part of mandibular movement study, and it is an important method to evaluate the function of stomatognathic system. In this study we analyzed the characters of condyle movement in Angleâ…¡2. We discussed the differences of condyle movement between Angleâ…¡2 and normal occlusion, and the differences of condyle movement between Angleâ…¡2 malocclusion with and without TMD. This study is to evaluate the interaction between Angleâ…¡2 and condyle movement, and to offer the guidelines for clinical precaution and treatment. Sample included control group(20 normal occlusion) and experimental group(19 Angleâ…¡2 without TMD, 18 Angleâ…¡2 with TMJ clicks).We used Computer aided axiography(CADIAXâ…¢) to record condyle movement of all subjects during mandible opening and closing, protrusion and retrusion, lateral movement. And we analyzed these qualitative and quantitative characters of condyle movement tracings by GAMMA dental software. The conclusions are as follow:1 Angleâ…¡2 has characteristic condyle movement tracing style. This is related to occlusal pattern.2 Angleâ…¡2 with TMJ clicks has characteristic condyle movement tracing style as Angleâ…¡2 without TMD, but exists individuality. Tracings are mostly asymmetry and lack of continuity.3 Reason of TMJ clicks can not obviously affect condyle movement during protrusion/retrusion movement in Angleâ…¡2.4 Functional status of uninjured side condyle can be influenced by affected side in Angleâ…¡2 with TMJ clicks.