Korean J Oral Maxillofac Radiol.
2008 Dec;38(4):203-208.
Quantitative analysis of the TMJ movement with a new mandibular movement tracking and simulation system
- Affiliations
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- 1Interdisciplinary Program in Radiation Applied Life Science major, College of Medicine, BK21, and Dental Research Institute, Seoul National University, Korea.
- 2Department of Oral and Maxillofacial Radiology, BK21, and Dental Research Institute, School of Dentistry, Seoul National University, Korea. wjyi@snu.ac.kr
- 3Department of Oral and Maxillofacial Surgery, BK21, and Dental Research Institute, School of Dentistry, Seoul National University, Korea.
Abstract
- 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 tracking. 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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