关键词: 垂直向面型, 自然头位, 颅面形态, 颈椎姿势

Abstract:

Objective To investigate the natural head position and cervical posture in the patients with different vertical facial patterns with skeletal class Ⅰ relationship, and to clarify the relationships between vertical facial patterns and natural head position, cervical posture in the patients with skeletal class Ⅰ relationship. Methods 94 patients aged 8-15 years old with skeletal class Ⅰ relationship were selected as the subjects. The subjects were classified into high angle group, average angle group, and low angle group according to their mandibular plane angles. The cephalometric radiographs in natural head position were taken, and the variables representing craniofacial morphology, head position, and craniocervical posture were measured. The intergroup differences in variables were compared. Results The inclinations of mandible to the true vertical and cervical column (ML/VER,ML/OPT,ML/CVT) were smallest in high angle group, and they were largest in low angle group (P<0.01); other variables representing head posture and craniocervical posture (NSL/VER,FH/VER,NSL/OPT,NL/OPT, NSL/CVT,FH/CVT) were largest in high angle group, and they were smallest in low angle group (P<0.05). The inclinations of ramus to cervical column (RL/OPT,RL/CVT) were largest in high angle group and they were smallest in low angle group (P<0.01). There were no significant differences in the inclinations of cervical column and cervical lordosis (OPT/HOR,CVT/HOR,OPT/CVT) among three groups (P>0.05). Conclusion The significant differences exist in natural head position and cervical posture among the patients with skeletal class Ⅰ relationship with different vertical facial patterns (high angle,average angle,low angle); the subjects with high angle show extended head position and cervical posture, while the subjects with low angle exhibit the opposite tendency.

Key words: vertical facial patterns, natural head position, craniofacial morphology, cervical posture