Scott Paul, DiBiase Andrew T, Sherriff Martyn, Cobourne Martyn T
Department of Orthodontics, East Kent Hospitals NHS Trust, King's College London, London, United Kingdom.
Am J Orthod Dentofacial Orthop. 2008 Oct;134(4):470.e1-8. doi: 10.1016/j.ajodo.2008.04.018.
The aim of this study was to compare the efficiency of mandibular tooth alignment and the clinical effectiveness of a self-ligating and a conventional preadjusted edgewise orthodontic bracket system.
A multicenter randomized clinical trial was conducted in 2 orthodontic clinics. Sixty-two subjects (32 male, 30 female; mean age, 16.27 years) with mandibular incisor irregularities of 5 to 12 mm and a prescribed extraction pattern including the mandibular first premolars were randomly allocated to treatment with Damon3 self-ligating (Ormco, Glendora, Calif) or Synthesis (Ormco) conventionally ligated brackets. Fully ligated 0.014-in nickel-titanium archwires were used first in both groups, followed by a sequence of 0.014 x 0.025-in and 0.018 x 0.025-in nickel-titanium, and 0.019 x 0.025-in stainless steel. Study casts were taken at the start of treatment (T1), the first archwire change (T2), and the placement of the final 0.019 x 0.025-in archwire (T3). Cephalometric lateral skull and long-cone periapical radiographs of the mandibular incisors were taken at T1 and T3.
No significant difference was noted (P >0.05) in initial rate of alignment for either bracket system. Initial irregularity influenced subsequent rate of movement, but sex, age, and appliance type were statistically insignificant. Alignment was associated with an increase in intercanine width, a reduction in arch length, and proclination of the mandibular incisors for both appliances, but the differences were not significant. Incisor root resorption was not clinically significant and did not differ between systems.
Damon3 self-ligating brackets are no more efficient than conventional ligated preadjusted brackets during tooth alignment.
本研究旨在比较下颌牙齿排齐的效率以及自结扎和传统预成直丝正畸托槽系统的临床效果。
在两家正畸诊所进行了一项多中心随机临床试验。62名受试者（32名男性，30名女性；平均年龄16.27岁），下颌切牙不齐5至12毫米，且有包括下颌第一前磨牙在内的规定拔牙模式，被随机分配接受Damon3自结扎（奥美科公司，加利福尼亚州格伦多拉）或Synthesis（奥美科）传统结扎托槽治疗。两组均首先使用完全结扎的0.014英寸镍钛弓丝，随后依次使用0.014×0.025英寸和0.018×0.025英寸镍钛弓丝，以及0.019×0.025英寸不锈钢弓丝。在治疗开始时（T1）、首次更换弓丝时（T2）以及放置最终的0.019×0.025英寸弓丝时（T3）制取研究模型。在T1和T3拍摄下颌切牙的头颅侧位X线片和下颌根尖长锥X线片。
两种托槽系统的初始排齐率均无显著差异（P>0.05）。初始不齐影响后续移动速度，但性别、年龄和矫治器类型在统计学上无显著意义。两种矫治器的排齐均伴随着牙间宽度增加、牙弓长度减小以及下颌切牙前倾，但差异不显著。切牙根吸收在临床上不显著，且两种系统之间无差异。
在牙齿排齐过程中，Damon3自结扎托槽并不比传统结扎的预成托槽更有效。
