骨性Ⅲ类错患者咀嚼时下颌运动特点的初步研究

Mandibular movement characteristics in patients with skeletal class Ⅲ malocclusion during chewing movement

目的:研究成人骨性Ⅲ类错患者咀嚼不同食物时的下颌运动。方法:对成人骨性Ⅲ类错伴下颌偏斜患者14例,不伴有下颌偏斜患者10例,以及10例正常对照组,利用下颌定位仪测量咀嚼运动时双侧髁突运动中心点以及切牙点在矢状向、冠状向、水平向的移动范围的面积比值。结果:咀嚼软食时,从矢状方向和水平方向看,偏斜组双侧髁突点的运动轨迹与非偏斜组和正常组差异显著(P<0.05),而3组样本切牙点运动轨迹的差异无统计学意义。咀嚼脆食时,3组样本在三个方向上的差异更加明显。咀嚼韧食时,在矢状方向上偏斜组偏斜侧髁突点和切牙点运动面积比值明显高于非偏斜组和正常组(P<0.01),而非偏斜侧髁突点运动面积比值仅明显高于正常组(P<0.05)。结论:成人骨性Ⅲ类错患者下颌运动受食物形态和质地的影响相对较大,下颌偏斜患者尤为明显。

Objective： To investigate mandibular movement characteristics in patients with skeletal class Ⅲ malocclusion during che- wing different foods. Methods： 14 skeletal class Ⅲ adult patients with mandibular asymmetry, 10 patients without mandibular asymme- try and 10 normal control cases were chosen to find out the different condylar and incisor movemeut area ratio based on the aid of AR- CUSdigma mandibular moving track analysis system. Results： First, during chewing soft food, the condylar tracing length of skeletal class HI adult patients with mandibular asymmetlT were significant different in saglttal and horizontal plane compared with the other two groups （ P 〈 0.05 ） , while the incisor point trajectory difference was not statistically significant. Second, the condylar and incisor movement characteristic showed much more different among three samples during chewing brittle food（ P 〈 0. 05 ）. Third, in sagittal plane, the deflective condylar movement area ratio was significantly higher than that of the other two groups during chewing hand food （P 〈 0.01 ）. Conclusion： The mandibular movement in skeletal class Ⅲ adult patients are affected obviously by the shape and texture of food. Asymmetric lower mandible patients have a greater preponderance of this phenomenon.