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目的:观察经固定正畸矫治的骨性Ⅱ类高角患者矫治后后平面及上牙轴倾斜度的变化。方法:对13例经直丝弓矫治技术,拔除4颗双尖牙矫治完成的骨性Ⅱ类高角患者矫治前后的X线头颅侧位定位片进行相关项目的测量,结果进行统计分析。结果:治疗后,后平面、U1-FH角及U7-FH角均减少,差异有统计学意义(p<0.05);U5-FH角增加,差异有统计学意义(p<0.05)。结论:骨性Ⅱ类高角患者矫治后后平面陡度减少,上颌牙牙轴由向心聚拢倾向于平行。
OBJECTIVE: To observe the change of inclination of upper bite axis and upper bite axis after orthodontic treatment in patients with high-angle skeletal Class Ⅱ malocclusion. Methods: Thirteen patients underwent X - ray cephalometric analysis before and after orthodontic treatment with straight wire brachial correction and removal of four bimaxillary angle correction patients. The related items were measured and the results were statistically analyzed. Results: After treatment, the angle of U1-FH and the angle of U7-FH decreased, the difference was statistically significant (p <0.05); the angle of U5-FH was increased, the difference was statistically significant (p <0.05). CONCLUSIONS: The steepness of plane decreases after correction in the patients with high skeletal Class Ⅱ angle, and the mandibular molar axis tends to be parallel to the heart.