Department of Biomedical Engineering, National Cheng Kung University, Tainan City, Taiwan.
Metal Industries Research & Development Centre, Kaohsiung City, Taiwan.
Clin Implant Dent Relat Res. 2017 Jun;19(3):447-457. doi: 10.1111/cid.12469. Epub 2017 Jan 11.
The study proposed a novel method for converting a radiographic guide into a surgical guide and evaluated its accuracy.
Radiographic guide was reformed with the addition of index rods for geometric conversion method (GCM). Planning implants were projected on geometric projection planes, and the implant positions were measured. The radiographic guide was converted into surgical guide using a generic bench drill machine with GCM data. Two experiments were designed to validate the GCM. (1) In vitro test: Twenty implants were placed on five edentulous dental models by using the GCM (group 1) and Stereolithography (SLA) method (group 2), respectively. The deviations of planned and placed implant were calculated, and the precision error (PE) value was calculated to evaluate the stability of the GCM and SLA. (2) In vivo test: Nine edentulous subjects were selected for clinical implant surgery with the GCM guide. Two level of the index rods of radiographic guides were prepared for surgical guides forming. The differences between the planned and actual implants were calculated in implant head, apex, and angulation.
The in vitro test revealed no significant differences in the planned and placed angulations between groups 1 and 2 (P > .05). The PE was not significantly different between groups 1 and 2 (P > .05). The in vivo test revealed a successful treatment of the subjects, and 16 implant sites were evaluated. The results indicated that GCM guide could achieve the three-dimensional (3D) offset deviations of 1.03 ± 0.27 mm and 1.17 ± 0.24 mm at the implant head and apex, respectively, and 1.37° ± 0.21° for the 3D angulation.
The novel method for converting a radiographic guide into a surgical guide appears accurate and stable compared with SLA.
本研究提出了一种将放射影像引导器转换为手术引导器的新方法，并对其准确性进行了评估。
通过添加用于几何转换方法（GCM）的指标杆对放射影像引导器进行改造。将规划种植体投影到几何投影平面上，并测量种植体的位置。使用具有 GCM 数据的通用台钻将放射影像引导器转换为手术引导器。设计了两个实验来验证 GCM。（1）体外试验：将 20 个种植体分别用 GCM（第 1 组）和立体光造型（SLA）方法（第 2 组）放置在 5 个无牙颌牙模型上。计算计划和放置种植体的偏差，并计算精度误差（PE）值，以评估 GCM 和 SLA 的稳定性。（2）体内试验：9 名无牙颌患者采用 GCM 导板进行临床种植手术。为手术导板成形准备了两个级别的放射影像引导器的指标杆。计算了种植体头部、根尖和角度的计划和实际种植体之间的差异。
体外试验结果显示，第 1 组和第 2 组之间的计划和放置角度没有显著差异（P＞.05）。第 1 组和第 2 组之间的 PE 无显著差异（P＞.05）。体内试验结果显示，所有患者均成功接受治疗，共评估了 16 个种植体部位。结果表明，GCM 导板可实现种植体头部和根尖处三维（3D）偏移误差分别为 1.03±0.27mm 和 1.17±0.24mm，3D 角度误差为 1.37°±0.21°。
与 SLA 相比，将放射影像引导器转换为手术引导器的新方法准确性和稳定性更高。
