Former Visiting Scholar, Division of Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, Ohio; Research Associate, Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Professor, Division of Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, Ohio.
J Prosthet Dent. 2020 Mar;123(3):466-472. doi: 10.1016/j.prosdent.2019.06.012. Epub 2019 Sep 18.
Information regarding the effect of the height and position of a coded healing abutment (CHA) on the trueness of intraoral digital scans is lacking.
The purpose of this in vitro study was to investigate the effect of the height and position of a scannable CHA on the trueness (distance and angular deviations) of intraoral digital scans.
Scannable CHAs (BellaTek Encode Impression system; Zimmer Biomet Dental) were used in 2 different height pairs (3 mm and 8 mm) on 2 implants at mandibular left second and first molar positions. Each pair was scanned 10 times by using 1 intraoral scanner (TRIOS; 3Shape) by 1 operator to generate a total of 20 intraoral scan files. Master standard tessellation language (STL) files were created for both 3-mm and 8-mm CHA pairs by using a structured blue light scanner (COMET L3D 8M 150 Precision Structured Blue Light Scanner; ZEISS). These master STL files were imported into a software program (PolyWorks Inspector) and were used as the reference for the inspection. Scans obtained by using the intraoral scanner were aligned to the reference scan by using a best-fit alignment to measure the distance and angular deviations. Two-way repeated-measures ANOVA was used to analyze the data, and the Tukey-Kramer test was used to determine significant differences among groups (α=.05).
The CHA position had a significant effect on distance deviation (P<.001). However, no significant effect of CHA height on distance deviation was found. The interaction between CHA height and position had a significant effect on the angular deviation (P=.041). The 3-mm posterior CHA (P=.026) and 8-mm anterior CHA (P=.039) had significantly lower angular deviations than the 8-mm posterior CHA.
The distance deviation of CHA was significantly influenced by position. CHAs in the anterior had lower distance deviations for both 3 mm and 8 mm. The effect of CHA height on distance deviation was found to be small and was affected by the location of the CHA. Height affected angular deviation depending on the position of the CHA. Both 3-mm posterior and 8-mm anterior CHAs showed lower angular deviations than the 8-mm posterior CHA.
关于编码愈合基台（CHA）的高度和位置对口腔内数字扫描准确性的影响的信息尚不清楚。
本体外研究的目的是调查可扫描 CHA 的高度和位置对口腔内数字扫描准确性（距离和角度偏差）的影响。
在下颌左第二和第一磨牙位置的 2 个种植体上使用 2 对不同高度的可扫描 CHA（BellaTek Encode Impression 系统；Zimmer Biomet Dental）。每个高度对都由 1 名操作员使用 1 台口腔内扫描仪（TRIOS；3Shape）扫描 10 次，共生成 20 个口腔内扫描文件。通过使用结构蓝光扫描仪（COMET L3D 8M 150 Precision Structured Blue Light Scanner；ZEISS）为 3mm 和 8mm CHA 对创建主标准三角测量语言（STL）文件。将这些主 STL 文件导入软件程序（PolyWorks Inspector）并用作参考进行检查。通过使用最佳拟合对齐将使用口腔内扫描仪获得的扫描与参考扫描对齐，以测量距离和角度偏差。使用双向重复测量方差分析来分析数据，使用 Tukey-Kramer 检验来确定组间的显著差异（α=.05）。
CHA 位置对距离偏差有显著影响（P<.001）。然而，CHA 高度对距离偏差没有显著影响。CHA 高度和位置之间的相互作用对角度偏差有显著影响（P=.041）。3mm 后 CHA（P=.026）和 8mm 前 CHA（P=.039）的角度偏差明显低于 8mm 后 CHA。
CHA 的距离偏差受位置显著影响。3mm 和 8mm 时，前 CHA 的距离偏差较小。CHA 高度对距离偏差的影响较小，并且受 CHA 位置的影响。高度取决于 CHA 的位置而影响角度偏差。3mm 后和 8mm 前 CHA 的角度偏差均明显低于 8mm 后 CHA。
