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[A study of mandible chewing movement in patients with developmental lateral jaw deformity]
Yan Dong1, Tian-wen Guo, Hong-chen Liu
1Department of Stomatology, General Hospital of PLA, Beijing 100853, China.
Objective:
The purpose of the present study was to investigate effects of developmental lateral jaw deformity (DLJD) on masticatory movement.
Methods:
Three coordinates of mandibular movement signals were recorded in 35 young healthy adults with normal occlusion and 28 patients with DLJD by means of a Sirognathography System during gum chewing movement. Paired and unpaired t-tests were used to compare significant difference of intra-group and inter-groups in displacement and speed. P < 0.05 was chosen as significance level.
Results:
(1) The rhythm and directional sequence of chewing trajectory in both frontal and sagittal planes were normal in control group, while anomalies of rhythm and distribution (n = 9) and reversed sequencing (n = 7) were found in DLJD group. (2) The maximum magnitude of jaw retrusion and average speed were significant higher in DLJD group than those in control group (P < 0.01). The spatial displacement and average speed in horizontal plane and in chewing phase were also higher in DLJD group compared with control group (P < 0.05).
Conclusions:
DLJD patients showed anomalies in chewing pattern as well as chewing speed and displacement in horizontal plane.
