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KMID : 0896020080380040203
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Korean Journal of Oral and Maxillofacial Radiology
2008 Volume.38 No. 4 p.203 ~ p.208
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Quantitative analysis of the TMJ movement with a new mandibular movement tracking and simulation system
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Kim Dae-Seung
Hwang Soon-Jung
Choi Soon-Chul
Lee Sam-Sun
Heo Min-Suk
Heo Kyung-Hoe
Yi Won-Jin
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Abstract
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Purpose : The purpose of this study was to develop a system for the measurement and simulation of the TMJ movement and to analyze the mandibular movement quantitatively.
Materials and Methods : We devised patient-specific splints and a registration body for the TMJ movement racking. The mandibular movements of the 12 subjects with facial deformity and 3 controls were obtained by using an
optical tracking system and the patient-specific splints. The mandibular part was manually segmented from the CT
volume data of a patient. Three-dimensional surface models of the maxilla and the mandible were constructed using
the segmented data. The continuous movement of the mandible with respect to the maxilla could be simulated by
applying the recorded positions sequentially. Trajectories of the selected reference points were calculated during
simulation and analyzed.
Results : The selected points were the most superior point of bilateral condyle, lower incisor point, and pogonion.
There were significant differences (P?0.05) between control group and pre-surgical group in the maximum displacement
of left superior condyle, lower incisor, and pogonion in vertical direction. Differences in the maximum lengths of the right and the left condyle were 0.59±0.30 mm in pre-surgical group and 2.69±2.63 mm in control group, which showed a significant difference (P?0.005). The maximum of differences between lengths of the right and the left calculated during one cycle also showed a significant difference between two groups (P?0.05).
Conclusion : Significant differences in mandibular movements between the groups implies that facial deformity
have an effect on the movement asymmetry of the mandible.
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KEYWORD
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Mandibular movement tracking and simulation, Optical tracking system, Patient-specific splints, Movement asymmetry of the mandible
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