下顎前突症患者の初診時における顎運動3次元解析-基本運動距離について-

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概要

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• Mandibular movements in 22 patients with mandibular prognathism were measured using a three-dimensional movement analyzing system developed at Kyushu University and compared with those of 20 controls, and also investigated differences between deviation prognathism and non-deviation prognathism.<BR>1. Comparison of the values of mandibular movements between patients with mandibular prognathism and controls.<BR>1) Analysis of mandibular movements revealed that interincisal distance (Im) for the patients was larger than that for controls, but there was no difference between the groups in maximum distance of the condylar path.<BR>2) The distance of incisal path (I) and antero-posterior distance of condylar path (Cs) during protrusive and lateral movements was smaller in patients than in controls, but this difference was not significant. The curve length of condylar path (C) was significantly smaller in patients than in controls.<BR>3) There was significant correlation between C and Cs (correlation coefficient r=0.849-0.975), suggesting that C could be estimated if Cs were known.<BR>4) The ratio of the distance of condylar path of protrusive (Cps) or lateral movement (Cls) to the maximum distance of condylar path (Cms) was calculated, and found to be smaller in patients than in controls.<BR>5) There was significant correlation between the values of movements of the incisal point and condylar points, suggesting that C and Cs could be estimated if "I" were known.<BR>2. Comparison between non-deviation prognathism and deviation prognathism of the mandible.<BR>1) Non-deviation prognathism of the mandible showed no significant difference between the deviated and non-deviated side on any parameter.<BR>2) Deviation prognathism of the mandible showed no significant difference between the sides for maximum distance of condylar path.<BR>During protrusive movement, the incisal point translated for the median line of the upper jaw, and the length of condylar path of the deviated side was significantly larger than that on the non-deviated side.<BR>During lateral movement, condylar path (the deviated side) and incisal path length were significantly larger when the mandible moved toward the non-deviated side.<BR>The results described above suggest that during protrusive and lateral movements, the length of the incisal path and the condylar path of the mandibular prognathism are somewhat smaller in the patients than those in controls, and that deviation prognathism of the mandible presents functional as well as morphological asymmetry.

• 社団法人 日本口腔外科学会の論文

著者

• 後藤 多津子

  九州大学歯学部口腔外科学第1講座

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• 下顎前突症患者の初診時における顎運動3次元解析-基本運動距離について-

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