Garbacea Antoanela, Alqahtani Ali F, Goodacre Brian, Alhelal Abdulaziz, Lozada Jaime, Kattadiyil Mathew T
Loma Linda University School of Dentistry Assistant Professor Prosthodontics and Implant Dentistry 11092 Anderson street UNITED STATES Loma Linda CA 92350 9092068096 Assistant Professor, Advanced Specialty Education Program in Prosthodontics and Implant.
Faculty, Department of Periodontics and Community Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia.
J Oral Implantol. 2022 Jul 11. doi: 10.1563/aaid-joi-D-21-00293.
Accuracy of completely edentulous arch scanning with implant scan bodies has not been completely validated for intraoral scanners. For desktop laboratory scanners validations were found in the literature. The aim of this in vitro study was to compare the dimensional accuracy of scanning with splinted and unsplinted scan bodies on a completely edentulous maxillary arch with 6 implants. A maxillary edentulous master cast with 6 implants was used as control for all implant level impressions. 6 implants were digitally planned and placed at different angulation of 0, 0 17° and 30°. A contact coordinate measuring machine (CMM) was used to generate baseline linear measurements of the master cast. Four test groups included: 2 intraoral scanners Trios (3shape, Copenhagen, Denmark) and True Definition (3M ESPE, St Paul, MN), one industrial scanner Atos (Core optical 3D scanner) and one conventional impression group scanned with laboratory scanner Dental Wings 7 Series. Each scan recording was made with splinted and unsplinted scan bodies. Digital datasets of all measurements were compared with the CMM baseline values using PolyWorks® InnovMetric Software in order to assess the linear and angular deviations and determine the accuracy of complete arch digital impression. Factorial ANOVA showed significant effect with splinting, scanner type, inter-implant distance and implant angulation for linear deviations. Splinted scan bodies revealed elevated linear and angular deviation values for all scanners with significantly highest deviations for True Definition scanner. Significant correlation was found between inter-implant distance and linear deviation (r =0.45, P =<0.001) with increased linear deviations among all scanners, regardless of splinting. ( P <0.05). Significant effect on accuracy was seen for angular deviation with splinting, scanner type and implant angulation; significant difference was found between 0° and 30° implant angulation ( P =0.035) with more deviation with 30° implant angulation. The accuracy of the complete arch implant digital impression using splinted scan bodies was significantly reduced for measurements that crossed the arch midline. The digital impression technique using a broad splint design to connect scan bodies was not found to improve the scan accuracy for intraoral scanners.
对于口腔内扫描仪而言，使用种植体扫描体进行全口无牙颌扫描的准确性尚未得到完全验证。对于台式实验室扫描仪，文献中有相关验证。本体外研究的目的是比较在上颌全口无牙颌且植入6枚种植体的情况下，使用联冠式和非联冠式扫描体进行扫描的尺寸精度。使用带有6枚种植体的上颌无牙颌主模型作为所有种植体水平印模的对照。6枚种植体通过数字化规划并以0°、17°和30°的不同角度植入。使用接触式坐标测量机（CMM）对上颌主模型进行基线线性测量。四个测试组包括：两台口腔内扫描仪Trios（3shape公司，丹麦哥本哈根）和True Definition（3M ESPE公司，美国明尼苏达州圣保罗）、一台工业扫描仪Atos（Core光学三维扫描仪）以及一个使用实验室扫描仪Dental Wings 7系列进行扫描的传统印模组。每次扫描记录均使用联冠式和非联冠式扫描体进行。使用PolyWorks® InnovMetric软件将所有测量的数字数据集与CMM基线值进行比较，以评估线性和角度偏差，并确定全牙弓数字印模的准确性。析因方差分析显示，对于线性偏差，联冠、扫描仪类型、种植体间距和种植体角度具有显著影响。对于所有扫描仪，联冠式扫描体显示出更高的线性和角度偏差值，其中True Definition扫描仪的偏差显著最高。无论是否联冠，在所有扫描仪中均发现种植体间距与线性偏差之间存在显著相关性（r =0.45，P =<0.001），且线性偏差增加（P <0.05）。对于角度偏差，联冠、扫描仪类型和种植体角度对准确性有显著影响；在0°和30°种植体角度之间发现显著差异（P =0.035），30°种植体角度的偏差更大。对于穿过牙弓中线的测量，使用联冠式扫描体进行全牙弓种植体数字印模的准确性显著降低。未发现使用宽联冠设计连接扫描体的数字印模技术能提高口腔内扫描仪的扫描准确性。
