垂直支持矫治器对高角病例垂直向控制效果的研究

目的:探讨垂直支持矫治器(VHA)对减数4颗第一前磨牙的高角患者垂直向控制的效果.方法:选择减数4颗第一前磨牙的高角患者40例,分为2组:VHA组20例,使用VHA进行垂直向控制;对照组20例,矫治过程中未采取垂直向控制措施.用Winceph 8.06软件对40例患者矫治前后的头颅侧位片进行常规头影测量,对测量值进行统计学分析.结果:VHA组中L6-MP,S-Go,N-Me,ANS-Me治疗后较治疗前增大(P＜0.05),其余项目无统计学差异(P＞0.05).对照组MP-SN,Y-axis,U1-PP,U6-PP,L6-MP,S-Go,N-ANS,N-Me,ANS-Me,ANS-Me/N-Me治疗后较治疗前增大(P＜0.05),S-Go/N-Me减小(P＜0.05),其余项目无统计学差异(P＞0.05).2组治疗前后的变化值比较,MP-SN,Y-axis,U6-PP,L6-MP,N-Me,ANS-Me,ANS-Me/N-Me,S-Go/N-Me VHA组较对照组小(P＜0.05),其余项目无统计学差异(P＞0.05).结论:高角患者在进行减数正畸治疗时,垂直支持矫治器可以有效控制上下颌磨牙的高度,有效地维持下颌平面角及前下面高.

The effects of the vertical holding appliance in the extraction treatment of patients with hyperdivergence

Objective:To observe the effects of the vertical holding appliance (VHA) in the extraction treatment of patients with hyperdivergence.Methods:40 hyperdivergent patients orthodonticly treated by 4 first premolar extraction with(VHA group) and without VHA(control group) (n =20) respectively.Cephalometric radiographs were taken before and after orthodontic treatment and measured digitally by Winceph 8.06 software.Results:After treatment,the L6-MP,S-Go,N-Me,ANS-Me increased in the VHA group(P ＜ 0.05).The MP-SN,Y-axis,U1-PP,U6-PP,L6-MP,S-Go,N-ANS,N-Me,ANS-Me,ANS-Me/N-Me increased and the S-Go/N-Me decreased in the control group(P ＜0.05).The changes of the MP-SN,Y-axis,U6-PP,L6-MP,N-Me,ANS-Me,ANS-Me/N-Me,S-Go/N-Me were smaller in the VHA group than those in the control group (P ＜ 0.05).Conclusion:VHA is effective in the control of the height of molars in the extraction treatment of patients with hyperdivergence.