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

Yang Xinhai, Zeng Xianglong Department of Orthodontics, School of Stomatology, Beijing Medical University  
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.
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