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The efficiency of mandibular mini-implants in reducing adverse effects of class II elastics in adolescent female patients: a single blinded, randomized controlled trial
Progress in Orthodontics ( IF 4.8 ) Pub Date : 2021-08-16 , DOI: 10.1186/s40510-021-00368-2
Mostafa M El-Dawlatly 1 , Mohamed A Mabrouk 2 , Amr ElDakroury 1 , Yehya A Mostafa 2
Affiliation  

Excessive proclination of lower incisors and other undesirable consequences usually result from the use of class II elastics during orthodontic treatment. The purpose of this study was to attempt to limit the adverse effects of class II elastics by the use of mini implants placed in the mandibular arch in adolescent class II female patients. The sample comprised 28 patients, (a mean age of 15.66 ± 2 years for intervention group and 15.1 ± 2.2 years for conventional group) with one-fourth or one-half unit class II canine relationship. The sample was divided into two equal groups. Randomization was carried out by a computer sequence generator with a 1:1 allocation ratio. In the intervention group, the mini implants were inserted between the lower second premolar and first molar, while the conventional group underwent regular class II elastics therapy. The active elastics treatment time was 8 months for both groups. Results were assessed by measurements from pre- and post-elastics lateral cephalometric radiographs. The change in L1 inclination (0.97 ± 0.92°) and L1 AP position (0.31 ± 0.63 mm) did not show a statistically significant difference between the two groups, but a statistically significant difference was found in the U1 retroclination (5.23 ± 1.92°) and U1 distal movement (4.05 ± 1.4 mm) [P ˂ 0.001] and [P ˂ 0.05] respectively in favor of the intervention group. Mini-implants in conjunction with class II elastics had no skeletal effect, mainly dentoalveolar and it did not prevent the proclination of lower incisors. There was more distal movement in the upper incisors in the skeletal anchorage group which helped in enhancing the camouflaging of class II malocclusion. Trial registered “FUE.REC (10)/10-2018” at the FUE registration council for clinical trials/IOP Orthodontic Program October 2018.

中文翻译:

下颌微型种植体在减少青春期女性患者 II 类弹性材料不良反应方面的有效性:一项单盲、随机对照试验

下切牙过度倾斜和其他不良后果通常是由于在正畸治疗期间使用 II 级弹性。本研究的目的是试图通过在青少年 II 类女性患者的下颌弓中使用微型植入物来限制 II 类弹性的不良影响。样本包括 28 名患者(干预组的平均年龄为 15.66 ± 2 岁,常规组的平均年龄为 15.1 ± 2.2 岁),具有四分之一或二分之一的 II 类犬类关系。样品被分成两个相等的组。随机化由计算机序列生成器以 1:1 的分配比进行。在干预组中,微型种植体被插入在下第二前磨牙和第一磨牙之间,而常规组则进行常规的II类弹力治疗。两组的主动弹力治疗时间均为 8 个月。结果通过弹性前后侧位 X 线片的测量进行评估。L1 倾角(0.97±0.92°)和 L1 AP 位置(0.31±0.63 mm)的变化在两组之间没有显示出有统计学意义的差异,但在 U1 后倾角(5.23±1.92°)中发现有统计学意义的差异和 U1 远端运动 (4.05 ± 1.4 mm) [P ˂ 0.001] 和 [P ˂ 0.05] 分别有利于干预组。微型种植体与 II 类弹性材料结合没有骨骼效应,主要是牙槽骨,并且不能防止下切牙的前倾。骨骼支抗组的上切牙有更多的远侧运动,这有助于增强对 II 类错牙合的伪装。2018 年 10 月在 FUE 注册委员会进行临床试验/IOP 正畸计划的试验注册“FUE.REC (10)/10-2018”。
更新日期:2021-08-16
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