Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea.
Department of Prosthodontics, Yonsei University College of Dentistry, Seoul, Korea.
Clin Oral Implants Res. 2020 Dec;31(12):1187-1198. doi: 10.1111/clr.13664. Epub 2020 Sep 22.
To determine the positional accuracy of implants placed with a three-dimensionally printed template having nonmetal sleeves and to determine the contributing factors to observed deviations.
One hundred and eighty-seven implants placed in 72 patients were analyzed. Presurgical intraoral scans and cone-beam computed tomography images obtained before and after surgery were superimposed, and vertical, angular, platform, and apex deviations were measured between the virtually planned and actually placed positions. A multiple linear regression model was designed for identifying the contributing factors. Statistical significance was set at p < .05, with Bonferroni correction if necessary (p < .0167).
A total of 187 implants demonstrated deviations of 0.65 [0.56, 0.75] mm (mean [95% confidence interval]) vertically, 3.59° [3.30°, 3.89°] angularly, 1.16 [1.04, 1.28] mm at platform, and 1.50 [1.36, 1.65] mm at apex. Implants placed in the mandible showed larger angular, platform, and apex deviations compared with those in the maxilla (p = .049, p = .014 and p = .003, respectively). Implants placed at the third or fourth nearest sites from the most-distal tooth had larger deviations than those placed at the first or second nearest sites, in vertical, platform, and apical aspects (p = .015, p = .011 andp = .018, respectively). This was only applicable to free-ending-supported templates (p < .0167), and anchor pin-supported free-ending templates (p < .0167).
Using a three-dimensionally printed surgical template with a nonmetal sleeve in the partial edentulous ridge resulted in larger deviations in implants placed in the mandible or distal free-end third or fourth nearest site.
确定使用具有非金属套管的三维打印模板放置植入物的位置准确性，并确定观察到的偏差的影响因素。
分析了 72 名患者的 187 个植入物。对术前口内扫描和术后获得的锥形束计算机断层扫描图像进行叠加，并测量虚拟计划位置和实际放置位置之间的垂直、角度、平台和根尖偏差。设计了一个多元线性回归模型来确定影响因素。统计学意义设定为 p<.05，如果需要则进行 Bonferroni 校正（p<.0167）。
总共 187 个植入物的偏差为 0.65 [0.56, 0.75] mm（平均值 [95%置信区间]）垂直，3.59°[3.30°，3.89°]角，1.16 [1.04, 1.28] mm平台和 1.50 [1.36, 1.65] mm根尖。下颌骨植入物的角度、平台和根尖偏差大于上颌骨植入物（p=0.049，p=0.014 和 p=0.003）。距离最远端牙齿第三或第四个最近的部位放置的植入物在垂直、平台和根尖方面的偏差大于距离最近的第一或第二个部位放置的植入物（p=0.015，p=0.011 和 p=0.018）。这仅适用于无末端支持模板（p<.0167）和锚钉支持的无末端自由端模板（p<.0167）。
在部分无牙颌嵴中使用具有非金属套管的三维打印模板会导致下颌骨或远端自由端第三或第四个最近部位放置的植入物产生更大的偏差。
