Ontario Dental Association, Toronto, Ontario, Canada.
J Orthod. 2023 Jun;50(2):243-251. doi: 10.1177/14653125221146565. Epub 2023 Jan 12.
An increasing number of clinicians have been utilising orthodontic mini-screws as temporary anchorage devices (TAD) in their practices, but variable successful rates have been reported. Here, we introduce a practical approach to inserting mini-screws successfully. Using computer-aided design (CAD) and computer-aided manufacturing (CAM) technology, the surgical guide for pre-drilling was designed and fabricated and mini-screws were placed following pre-drilling holes in two cases. Two Ø2.0 × 10.0-mm mini-screws were inserted into the prepared holes in the mandibular buccal shelf (MBS) on both sides with a hand driver to distalise the lower molars for Class III correction. The treatment was done successfully, after 12 months of treatment in one case. Two Ø1.6 × 8.0-mm mini-screws were inserted into the prepared holes in the mandibular alveolar process in another case with congenital absence of lower right second premolar. One mini-screw was in the buccal alveolar process between the mandibular right canine and first premolar and the other in the lingual alveolar process between the mandibular right first premolar and second primary molar. The lower right molars would be protracted to close the space left after the extraction of the primary molar using the two mini-screws. The case was still in treatment.
越来越多的临床医生在实践中使用正畸微螺钉作为临时锚固装置（TAD），但报告的成功率各不相同。在这里，我们介绍一种成功植入微螺钉的实用方法。使用计算机辅助设计（CAD）和计算机辅助制造（CAM）技术，设计并制作了预钻孔手术导板，并在两个病例中进行了预钻孔后放置微螺钉。使用手钻将两根 Ø2.0×10.0mm 的微螺钉插入双侧下颌颊棚（MBS）的预备孔中，以远移下颌磨牙进行 III 类矫正。一个病例在治疗 12 个月后成功完成治疗。另一个病例中，由于下颌右侧第二前磨牙先天性缺失，将两根 Ø1.6×8.0mm 的微螺钉插入下颌牙槽突的预备孔中。一个微螺钉位于下颌右侧尖牙和第一前磨牙之间的颊侧牙槽突中，另一个位于下颌右侧第一前磨牙和第二乳磨牙之间的舌侧牙槽突中。使用这两个微螺钉可以将下颌右侧磨牙向远中牵引，以关闭第一乳磨牙拔除后留下的间隙。该病例仍在治疗中。
