【摘要】 目的研究摇椅形弓丝矫治骨性前牙反后的颌面部硬组织变化。方法骨性Ⅲ类错畸形患者9例,男3例,女6例,年龄12～17岁,平均14.3岁,治疗时间为(2.3±0.4)年,使用摇椅形弓丝技术进行矫治,测量矫治前(T1)和矫治后(T2)的头颅侧位X线片,对数据做配对t检验分析。结果治疗结束后上下前牙均代偿性移动,建立正常覆覆盖关系。治疗后L1-MP减小9.51°(t=7.19,P<0.01),U1-SN增加了2.17°,差异无统计学意义(t=-1.47,P>0.05),下磨牙远中直立,上磨牙趋向于前倾,OP-MP增大3.5°(t=-5.79,P<0.01),平面变平,ANB角平均增大0.62°(t=-5.14,P<0.01),但幅度有限,SN-MP变化无统计学意义(t=-0.08,P>0.05),提示患者的垂直向得到较好的控制。结论摇椅形弓丝能有效矫治骨性Ⅲ类错,其矫治机理与多曲方丝弓技术相似,但其临床操作简便。更多还原

【Abstract】 Objective To study the changes of hard tissues of the profile of skeletal Class Ⅲ patients treated with the reverse-curve arch wire: a modified MEAW technique,and to analyze the effect of the reverse-curve arch in the treatment.Methods The subjects of the study included 9 cases(male 3,female 6) of skeletal Class Ⅲ malocclusion,their age ranging from 12 to 17 years old with an average age of 14.3 years.The cases were treated with the reverse-curve arch wire: a modified MEAW technique and the average treatment time was(2.3±0.4) years.Lateral cephalometric films taken at the beginning(T1) and the end(T2) of the treatment were analyzed with traditional cephalometric analysis.Paired t-test was performed to evaluate the significance of treatment change.Results Normal overbite and overjet were established with the compensatory movement of the upper and lower anterior teeth.L1-MP decreased 9.51 °(P<0.01),but U1-SN increased 2.17° with no significant change.The lower molars were uprighting distally while the upper molars were anteverted.OP-MP increase 3.50°(P<0.01).The occlusion plane became flatter,and ANB increased 0.62°(P<0.01).However,no significant difference was found for the SN-MP,which means that the vertical dimension was in good control.Conclusion The reverse-curve arch wire: a modified MEAW technique can treat the skeletal Class Ⅲ malocclusion effectively with a similar treatment mechanism to MEAW.It is simple and worth promoting.更多还原