直丝弓一步和两步滑动法的比较研究

Comparison of One step and Two step Sliding Technique using Straight Wire Appliance

本研究利用三维坐标测量仪,开发了正畸牙移动的上颌测量系统,并采用前瞻性配对设计,对16例拔除四个第一双尖牙、使用国产Roth数据直丝弓矫治器矫治的病例,分两组分别进行一步滑动法和两步滑动法关闭间隙。测量研究的结果显示:两步法在节省支抗上要稍优于一步法,但临床上不显著,一步法在时间上要明显短于两步法,两者在维持覆、维持前牙转矩方面无显著差别。本研究认为。

SWA(straight wire appliance) technique for extraction cases developed significantly in recent years, such as sliding technique in the space closure stage. Space closure with sliding technique can be done by one or two steps. Different opinions have been formed about their difference, and the experimental studies are in need. We chose 16 first premolar extraction cases, which had been planned for prospective paired t test. All cases were treated by SWA of Roth set up. The measurements of dental models and cephalogram were taken using our new measuring methods. The conclusions of our study were as follows: Two step sliding technique was slightly better than one step technique in anchorage control, but used much more time. There Were no significant difference in the changes of overbite and incisor torque between these two techniques. So we prefer one step sliding technique to two step sliding technique when using SWA.