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  • Title: [A study of mandible chewing movement in patients with developmental lateral jaw deformity].
    Author: Dong Y, Guo TW, Liu HC, Wang XM, Wang MQ.
    Journal: Zhonghua Kou Qiang Yi Xue Za Zhi; 2005 Jan; 40(1):74-7. PubMed ID: 15774159.
    Abstract:
    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.
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