Aly Abdelrehim BDS, MSc , Eshamsul bin Sulaiman BDS, MFD.RCS, MClinDent , Hazrina Sofian BCompSc, MCompSc, PhD , Nosizana Mohd Salleh DDS, PhD
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引用次数: 0
Abstract
Statement of problem
The precision and accuracy of intraoral scanners for complete arch implant scanning is questionable as it is affected by the absence of anatomic features, the presence of large homogenous areas, and the lack of clear reference points, all of which create inherent errors in the image stitching process by the scanner software program.
Purpose
The purpose of this in vitro study was to test a newly designed scan-aid apparatus for evaluating the effect of geometric heterogeneity and additional reference points on the time efficiency and scanning precision of complete arch implant scanning.
Material and methods
A total of 60 scans (20 per group) were performed using an intraoral scanner in 3 different clinical simulations: 2 parallel implants, 4 parallel implants, and 4 implants; 2 anterior implants in parallel axial orientation; and 2 distal implants with a 30-degree posterior inclination. The scanning procedure was alternated between scanning with the scan-aid apparatus (test groups; 4IP+, 4IA+, 2IP+) and without (control groups; 4IP-, 4IA-, 2IP-). A 3-dimensional (3D) inspection software program was used to assess scan precision. Test group scans were compared with a reference scan for repeatability, with and without the scan-aid apparatus. One scan per group was the reference; the others were superimposed by using a best-fit algorithm. The 3D standard deviations were recorded for repeatability analysis. To assess time efficiency, the total scanning time, actual scanning time, and time lost were measured. A paired t test was used to compare means between the groups (α=.05).
Results
Precision was significantly higher in the test groups using the scan-aid apparatus than in the control groups (P<.05). Furthermore, scanning with the scan-aid apparatus was significantly more time efficient (P<.05).
Conclusions
Additional reference points and geometric heterogeneity using a scan-aid apparatus significantly improved the precision and time efficiency of complete arch implant scanning
期刊介绍：
The Journal of Prosthetic Dentistry is the leading professional journal devoted exclusively to prosthetic and restorative dentistry. The Journal is the official publication for 24 leading U.S. international prosthodontic organizations. The monthly publication features timely, original peer-reviewed articles on the newest techniques, dental materials, and research findings. The Journal serves prosthodontists and dentists in advanced practice, and features color photos that illustrate many step-by-step procedures. The Journal of Prosthetic Dentistry is included in Index Medicus and CINAHL.
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