Abstract:
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Purpose: To evaluate a new quantitative method to analyze temporomandibular joint (TMJ) kinetics.
Methods and Materials: We took sequential images during various stages of movement of the TMJ ranging from a fully closed to a fully open position of healthy volunteers by a dynamic Flat Panel Detector (FPD). Since the TMJ is the articulation between the condyle of the mandible and the squamous portion of the temporal bone, normal or dysfunctional movement of the TMJ can be evaluated by analyzing condylar movement. Accumulated image subtraction was used to enhance these condyle images and Sequential Similarity Detection Algorithm (SSDA) was mainly used to trace the movement of the condyles.
Results: After analyzing our measurements, we found the position of left and right condyles became asymmetrical during mouth movement. The amplitudes of the maximum movement of the left and right condyles were measured to be 15.6 mm and 17.4 mm, respectively. We also measured the condylar movement in the area close to the articular tubercles and found it to be faster than other inter articular areas. Furthermore, the temporal change of the maximum velocity was different between the left and right sides. The left and right angles of the condylar long axis ranged from 20.0 to 28.1 degrees (Ave. = 24.8) and 16.4 to 26.9 degrees (Ave. = 22.1), respectively.
Conclusion: Our new method provides detailed dynamic data concerning the movement along the condyle of the TMJ. This data can be used to aid in the diagnosis of pre and post-operative temporomandibular disorders (TMD) patients.
Questions about this event email: papil@f2.dion.ne.jp
Otani, Y,
Kinetic Analysis of the Temporomandibular Joint (TMJ) by a Dynamic Flat Panel Detector. Radiological Society of North America 2003 Scientific Assembly and Annual Meeting, November 30 - December 5, 2003 ,Chicago IL.
http://archive.rsna.org/2003/3106277.html
