MBT直丝弓矫治技术应用于矫治错（牙合）畸形的临床效果观察

Observation of the clinical effect of MBT straight wire appliance in the treatment of patho-occlusion

目的 探讨MBT直丝弓技术矫治安氏Ⅱ类1分类错（牙合）的临床效果.方法 选择62例成年人安氏Ⅱ类1分类并开（牙合）患者,采用随机表格法分为观察组32例和对照组30例,观察组采用MBT直丝弓矫治器治疗,对照组采用传统直丝弓矫治器治疗.两组均在治疗前后拍摄头颅侧位片,观察记录两组治疗前后临床效果.结果 观察组患者治疗后的SNA、SNB、ANB、LI-MP、MP-SN与治疗前比较,差异均无统计学意义（t=0.46、0.73、0.24、1.05,均P＞0.05）,而ANB、U1-SN、U1-L1与治疗前比较,差异有统计学意义（t=1.58、6.32、7.43,均P＜0.05）,治疗前开（牙合）7 mm,治疗后OB 2 mm,恢复了正常覆（牙合）覆盖,差异有统计学意义（t=3.26,P ＜0.05）.观察组患者的平均矫治时间（22.0±2.5）个月,显著低于对照组患者（31.0±3.8）个月,差异有统计学意义（t =7.47,P＜0.05）.治疗后观察组患者U1-SN、U1-L1与OB均显著优于对照组,有统计学差异（=5.47、3.43、5.41、1.67,均P＜0.05）.结论 MBT直丝弓矫治技术临床操作简单,牙齿定位准确,可简化矫治程序和缩短治疗时间,值得临床推广.

Objective To investigate the clinical effect of the MBT straight wire technique for treatment of angle class Ⅱ 1 patho-occlusion.Methods 62 cases of adult class Ⅱ division 1 patients were randomly divided into the observation group （32 cases） and the control group （30 cases）.The observation group was treated with MBT straight wire appliance therapy,the control group received the traditional straight wire appliance therapy.The two groups were given cephalometric film before and after treatment,and the clinical effect was observed and recorded.Results In the observation group,there were no significant differences in SNA,SNB,ANB,LI-MP,MP-SN after treatment compared with before treatment （t =0.46,0.73,0.24,1.05,P ＞ 0.05）,while there were statistically significant differences in ANB,U1-SN,U1-L1 after treatment compared with before treatment （t =1.58,6.32,7.43,P ＜ 0.05）.Before treatment 7 mm of openbite,OB 2 mm after treatment,returned to normal overbite and overjet,there was statistically significant difference（t =3.26,P ＜ 0.05）.The mean treatment time was （22.0 ± 2.5） months in the observation group,it was significantly lower than（3 1.0 ± 3.8）months in the control group,there was statistically significant difference （t =7.47,P ＜ 0.05）.After treatment,U1-SN,U1-L1 and OB in the observation group were significantly better than those of the control group,there were statistically significant differences（t =5.47,3.43,5.41,1.67,all P ＜ 0.05）.Conclusion MBT straight wire appliance has the advantages of simple operation,accurate positioning of teeth,simplified correction procedure and short treatment time,it is worth the clinical promotion.