Angle Orthod. 2021 Nov 1;91(6):778-785. doi: 10.2319/020921-118.1.
To compare the transfer accuracy of four different lingual retainer (LR) transfer methods using three-dimensional digital models.
Four groups of 17 patients each were created: finger transfer (FT), silicone key transfer (SKT), acrylic resin transfer (ART), and indirect bonding (IDB). At the end of orthodontic treatment, the mandibular dental casts of patients were scanned with the LR wire. Then, intraoral scanning of the mandibular arches was performed after bonding the retainer wires. Linear and angular measurements were made using software on superimposed digital models.
Horizontal and vertical errors among the teeth were not significantly different among the FT, SKT, and ART groups. However, in the IDB group, linear transfer errors showed significant differences among the different teeth. The tip and rotation errors in the FT group were not significantly different among the teeth. The angular errors were lower in canines than in the incisors. In all measured parameters, the SKT group showed the lowest errors, whereas the FT group had the highest transfer errors in all parameters except vertical.
Among the transfer methods tested, SKT was determined to have the highest clinical accuracy.
通过三维数字模型比较四种不同舌侧保持器（LR）转移方法的转移精度。
创建四组每组 17 名患者：手指转移（FT）、硅酮键转移（SKT）、丙烯酸树脂转移（ART）和间接粘接（IDB）。在正畸治疗结束时，用 LR 线扫描患者的下颌牙列模型。然后，在粘接保持器线后，对下颌弓进行口内扫描。使用软件在叠加的数字模型上进行线性和角度测量。
FT、SKT 和 ART 组之间牙齿的水平和垂直误差没有显著差异。然而，在 IDB 组中，不同牙齿之间的线性转移误差存在显著差异。FT 组中切牙和尖牙的尖端和旋转误差没有显著差异。在所有测量参数中，SKT 组的误差最低，而 FT 组除了垂直方向之外，在所有参数中的转移误差最高。
在所测试的转移方法中，SKT 被确定为具有最高临床精度。
