Felemban Nayef H, Al-Sulaimani Fahad F, Murshid Zuhair A, Hassan Ali H
Department of Orthodontics, Dental Center, Al Noor Specialist Hospital, Makkah, Saudi Arabia.
Department of Preventive Dental Science, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
J Orthod Sci. 2013 Jan;2(1):28-37. doi: 10.4103/2278-0203.110330.
In the present report, two techniques of space closure; two-step anterior teeth retraction (TSR) and en masse retraction (ER) were used in two adult patients who had bimaxillary protrusion and were treated with four premolar extractions and fixed orthodontic appliance therapy. Both patients had a Class I dental malocclusion and the same chief complaint, which is protrusive lips. Anterior teeth were retracted by two-step retraction; canine sliding followed by retraction of incisors with T-loop archwire in the first patient and by en masse retraction using Beta titanium alloy T-loop archwire in the second case. At the end of treatment, good balance and harmony of lips was achieved with maintenance of Class I relationships. The outcome of treatment was similar in the two patients with similar anchorage control. ER can be an acceptable alternative to the TSR during space closure since it is esthetically more acceptable. However, it requires accurate bending and positioning of the T-loop.
在本报告中，对两名双颌前突的成年患者采用了两种间隙关闭技术，即两步前牙后移（TSR）和整体后移（ER），这两名患者均接受了拔除四颗前磨牙及固定正畸矫治器治疗。两名患者均为安氏Ⅰ类错牙合，主诉相同，即嘴唇前突。第一名患者通过两步后移法后移前牙，即先拉尖牙滑动，然后用T形曲弓丝内收切牙；第二名患者则使用β钛合金T形曲弓丝通过整体后移法内收前牙。治疗结束时，在维持安氏Ⅰ类关系的同时，实现了唇部良好的平衡与协调。在类似的支抗控制下，两名患者的治疗效果相似。在间隙关闭过程中，整体后移法作为两步前牙后移法的替代方法是可以接受的，因为它在美学上更易被接受。然而，这需要对T形曲进行精确的弯制和定位。
