Angle Orthod. 2020 Sep 1;90(5):634-639. doi: 10.2319/111119-712.1.
To examine the effect of micro-osteoperforation (MOP) on the space closure rate using passive self-ligating or conventional brackets.
This was a two-arm parallel randomized controlled trial undertaken at the outpatient department of a dental college. There were 60 participants (30 women and 30 men) who fulfilled the inclusion criteria. Both the study and control groups were subjected to MOPs throughout the period of space closure. MOPs were repeated every 28 days. The experimental group (mean age 19.5 ± 1.66 years) was bonded with passive self-ligating brackets while the control group (mean age 19.9 ± 1.13 years) was bonded with conventional brackets. Both groups were examined and compared for rate of space closure. An evaluation was conducted for both groups until the entire extraction space was closed and confirmed by evaluation of a tight contact between the canine and the second premolar using a piece of dental floss.
Before the initiation of retraction, all initial criteria were similar between the two groups (P > .05). No difference was observed between the two groups in the rate of space closure (P > .05).
MOP in conjunction with passive self-ligation does not increase the rate of orthodontic space closure when compared with MOP used with conventional brackets.
研究微骨切开术（MOP）联合被动自锁托槽或传统托槽对关闭间隙速率的影响。
这是一项在牙科院校门诊进行的双臂平行随机对照试验。共有 60 名参与者（30 名女性和 30 名男性）符合纳入标准。在整个间隙关闭期间，研究组和对照组均接受 MOP 治疗。MOP 每 28 天重复一次。实验组（平均年龄 19.5 ± 1.66 岁）使用被动自锁托槽固定，对照组（平均年龄 19.9 ± 1.13 岁）使用传统托槽固定。比较两组的间隙关闭率。两组均进行检查，并评估犬齿和第二前磨牙之间的紧密接触情况，使用牙线进行确认，直到完全关闭所有拔牙间隙。
在开始回缩之前，两组的所有初始标准均相似（P >.05）。两组的间隙关闭率无差异（P >.05）。
与传统托槽相比，MOP 联合被动自锁托槽并不能提高正畸间隙关闭的速度。
