악안면 기형환자에서 내측 익돌근 근력측정 및 의미분석

Analysis of the resistant muscle force against distraction in the maxillo-facial deformities

Recents reports have demonstrated that force and direction is important during mandibular distraction osteogenesis. The purpose of this study was to evaluate the resistant force of internal pterygoid muscles and inquire into relationship between internal pterygoid muscles and cephalometric parameters. Eighty four patients with class III malocclusion underwent bilateral sgittal splitting of ramus with intraoral verticosagittal ramal osteotomy. A spring scale were used for measuring for resistence of internal pterygoid mescles after splitting of ramus. Skeletal-dental cephalometric analysis was made following statistic package was used for correlation between resistence and cephalometric parameters. The resistant force of right internal pterygoid muscle was greater than left muscle in Korean with class III malocclusion and the force had a linear regression realtionship with facial depth (distance bwteen nasion and gonion). The results suggested that facial depth has significant correlation of the resistance of internal pterygoid muscle (p < 0.05).