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目的:对安氏Ⅱ类1分类Ⅲ度深覆盖错患者使用口外弓推磨牙向远中进行矫治,观察矫治前后颌面部硬组织变化情况。方法:9例安氏Ⅱ类1分类深覆盖错患者,女6例,男3例,年龄16～26岁,平均21岁,采用口外弓推磨牙向远中和MBT直丝弓矫治器矫治,对矫治前后的模型及X线头影测量进行分析比较,进行配对t检验分析。结果:治疗后上下牙弓尖牙间宽度增加,但无统计学意义,磨牙间宽度基本不变。前牙覆盖平均由8.23 mm减少至2.85mm,ANB角平均减少1.15°,U1/SN平均减小11.54°,L1/MP角及上下中切牙切角平均增加1.23°和11.28°,NP/FH平均增加3.61°,Y轴角平均减小2.96°,均有显著统计学意义。结论:对于低角或偏低角的安氏Ⅱ类1分类伴深覆盖年青成人病例,采用非拔牙矫治,通过口外弓推磨牙远移,上切牙直立,Ⅱ类牵引导下颌向前及唇倾下切牙减小前牙覆盖,可以达到理想的矫治效果。
OBJECTIVE: To investigate the changes of hard tissue in maxillofacial region before and after orthodontic treatment in patients with Class Ⅱ Division 1 Ⅲ degree deep covering malocclusion using oral extracorporeal bowel molars. Methods: 9 cases of Class Ⅱ Division 1 patients with deep covering the wrong patients, 6 females, 3 males, aged 16 to 26 years, mean 21 years old, , Before and after correction of the model and X-cephalometry analysis were compared, paired t-test analysis. Results: After treatment, the width of the upper and lower arch teeth increased, but no statistical significance, the width of the molar basically unchanged. The coverage of anterior teeth decreased from 8.23 mm to 2.85 mm on average, the average ANB angle decreased 1.15 °, the average U1 / SN decreased 11.54 °, and the L1 / MP angle and incision of upper and lower incisors increased 1.23 ° and 11.28 ° on average, NP / FH An average increase of 3.61 °, Y-axis angle average reduction of 2.96 °, were statistically significant. CONCLUSIONS: For low-angle or low-angle Class Ⅱ Division 1 patients with deep-covered adult cases of young adults, non-extracavitating orthodontic treatment is adopted. Lower incisors to reduce the coverage of anterior teeth, can achieve the desired effect of orthodontic treatment.