Department of Orthodontics, Kanagawa Dental University.
J Oral Sci. 2022 Jul 1;64(3):232-235. doi: 10.2334/josnusd.21-0536. Epub 2022 May 30.
This study aimed to evaluate the causal relationship between root contact and root contact length of orthodontic miniscrew implants (miniscrews), and assessed factors for implant failure through cone-beam computed tomography (CBCT) images.
First, a logistic regression analysis was performed to investigate the most relevant factors for implant failure based on sex, age, vertical skeletal pattern, horizontal skeletal pattern, and presence of root contact in 59 patients (mean age: 21.2, age range: 13-54 years) who had miniscrew implants. Next, 38 miniscrews (1.6 mm in diameter and 8.0 mm in length) with root contact were investigated in the patients. Root contact length was measured using CBCT taken after miniscrew implant placement.
The results showed that root contact was the most critical risk factor for failure of miniscrew implants in patients. Logistic regression analysis showed that the risk approximately doubled as the root contact length increased by 1.0 mm.
Avoiding proximity to the root during miniscrew implant placement is essential to prevent implant failure.
本研究旨在通过锥形束计算机断层扫描（CBCT）评估正畸微螺钉种植体（微螺钉）的根接触与根接触长度之间的因果关系，并评估种植体失败的相关因素。
首先，对 59 名患者（平均年龄：21.2 岁，年龄范围：13-54 岁）进行 logistic 回归分析，以调查性别、年龄、垂直骨骼模式、水平骨骼模式和根接触对微螺钉种植体失败的最相关因素。接下来，对有根接触的 38 颗微螺钉（直径 1.6mm，长 8.0mm）进行研究。在微螺钉植入后，使用 CBCT 测量根接触长度。
结果表明，根接触是患者微螺钉种植体失败的最关键危险因素。逻辑回归分析显示，根接触长度每增加 1.0mm，风险约增加一倍。
在微螺钉植入过程中避免靠近根部是预防种植体失败的关键。
