An in vitro study of a combined patient-specific device for safe and accurate insertion of infrazygomatic crest miniscrews.

Bingran Du, Xiaoyi Wang, Jun Wang, Mohan Ji, Qin Yi, Jiang Jiang, Jinchuan Tan, Jianyi Li
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Abstract

Objectives: To develop and assess the efficacy of a novel combined patient-specific device (CPSD) for the accurate and safe insertion of infrazygomatic crest miniscrews in orthodontic procedures.

Materials and methods: Twenty-eight miniscrews were placed in the infrazygomatic crest region of 28 cadaver maxillae using the direct manual method (n = 14) or the CPSD (n = 14) based on preset trajectories. The CPSD, designed based on the integration model, included a positioning guide, an insertion guide, and a depth-limiting groove. Deviations in the insertion site, tip location, insertion angle, and biting depth between the preset and real insertion trajectories were calculated to evaluate the accuracy of miniscrew insertion. Classification frequencies of root proximity, sinus penetration depth, and biting depth of the miniscrew after insertion were also calculated to evaluate the safety of miniscrew insertion.

Results: Regarding evaluation of accuracy, significant differences were observed in the deviation values of the insertion site, tip location, insertion angle, and biting depth between the CPSD and freehand groups (P = .001, P < .001, P < .001, P = .039, respectively). Regarding evaluation of safety, a significant difference was observed in the classification frequencies of root proximity between the two groups (P = .016).

Conclusions: Compared with manual insertion, CPSD could be a preferred method for safe and accurate insertion of infrazygomatic crest miniscrews for orthodontists.

用于安全、准确插入颧骨下微型螺钉的患者专用组合装置的体外研究。
目的开发一种新型患者专用组合装置(CPSD),并评估其在正畸过程中准确、安全地插入颧骨下微型螺钉的功效:使用直接手动方法(14 例)或基于预设轨迹的 CPSD(14 例),在 28 例尸体上颌骨的颧嵴下区域放置了 28 个微型螺钉。根据整合模型设计的 CPSD 包括定位导板、插入导板和限深槽。计算预设轨迹与实际插入轨迹之间在插入部位、尖端位置、插入角度和咬合深度方面的偏差,以评估微型螺钉插入的准确性。此外,还计算了迷你螺钉插入后牙根接近度、窦穿透深度和咬合深度的分类频率,以评估迷你螺钉插入的安全性:在准确性评价方面,CPSD组和徒手组在插入部位、尖端位置、插入角度和咬合深度的偏差值上存在显著差异(分别为P = .001、P < .001、P < .001、P = .039)。在安全性评估方面,两组间牙根邻近度的分类频率存在显著差异(P = .016):结论:与手动插入相比,CPSD 是正畸医生安全、准确地插入颧骨下微型螺丝的首选方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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