Sakthi S Vijayashri, Vikraman B, Shobana V R, Iyer S Kavitha, Krishnaswamy N R
Department of Orthodontics, Ragas Dental College and Hospital, Chennai, Tamil Nadu, India.
Indian J Dent Res. 2014 Nov-Dec;25(6):748-54. doi: 10.4103/0970-9290.152191.
To assess the efficiency and treatment outcome of patients treated with corticotomy-assisted en-masse orthodontic retraction as compared with the en-masse retraction without corticotomy.
Forty adult patients with bimaxillary protrusion requiring correction of bidental proclination constituted the sample. The study group consisted of 22 patients (male 11, female 11) willing to undergo surgery to reduce the duration of their orthodontic treatment and 18 patients (male 9, female 9) desirous of undergoing conventional orthodontic treatment without surgical intervention constituted the control group. Comparison of rate of retraction and anchor loss between the study and the control group was assessed.
Average rate of space closure of 1.8 mm/month in the maxilla and 1.57 mm/month in the mandible was observed in the study group compared to 1.02 mm/month in the maxilla and 0.87 mm/month in the mandible in the control group. The rate of retraction accelerated during the first 2 months of retraction. Molar anchor loss of approximately 0.6 mm occurred in the study group, and 1.8 mm occurred in the control group during the 4 months.
The rate of retraction with study group was twice as faster when compared to the control group, accelerating during the first 2 months of retraction. There was better anchorage control with the undecorticated molar segment during the retraction period but was found to increase as time advanced.
评估皮质骨切开辅助整体正畸后移与非皮质骨切开整体后移患者的治疗效率和治疗结果。
样本包括40例需要矫正双牙列前突的成年患者。研究组由22例（男11例，女11例）愿意接受手术以缩短正畸治疗时间的患者组成，18例（男9例，女9例）希望接受非手术常规正畸治疗的患者组成对照组。评估研究组与对照组之间的后移速率和支抗丧失情况。
研究组上颌平均每月关闭间隙1.8 mm，下颌为1.57 mm；而对照组上颌为1.02 mm/月，下颌为0.87 mm/月。后移速率在开始后移的前2个月加快。在4个月期间，研究组磨牙支抗丧失约0.6 mm，对照组为1.8 mm。
研究组的后移速率是对照组的两倍，在开始后移的前2个月加快。在牙齿后移期间，未行皮质骨切开的磨牙段支抗控制较好，但随着时间推移支抗丧失增加。
