Effects of inter-implant distance on the accuracy of intraoral scanner : an in vitro study

Name: Tharathip Kulchotirat

LCSH: Dental implants

LCSH: Scanning systems -- Dental care

Abstract: Background: Several studies focused on the accuracy of intra-oral scanners in implant dentistry, but the data of inter-implant distances were not widely mentioned. Therefore, this study aimed to evaluate the effect of distance between two implants on the surface distortion of scanned models generated by intra-oral scanners. Materials and methods: Three models with the distances between two fixed scan bodies of 7, 14, and 21 mm were fabricated and scanned with a highly precise 3Shape D900L dental laboratory scanner as reference models. Fifteen scans were performed with TRIOS3 and CEREC Omnicam intra-oral scanners. Trueness, precision, and angle deviation of the test models were analyzed in GOM inspect software. Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney U test. Results: There was a significant difference among each inter-implant distance in both intraoral scanners (P<.001). The error of trueness and precision increases with the increasing inter-implant length, while the angle deviation did not show the same trend. A significant difference in angle deviation was found among the inter-implant distance. The greatest angle deviation was reported in the 14-mm group of both scanners (P<.05). In contrast, the lowest angle deviation in the 21-mm group of the TR scanner and the 7-mm of the CR scanner was reported (P<.001). Conclusions: The inter-implant distance affected the accuracy of intra-oral scanner. The error of trueness and precision increased along with the increasing distance between two implants. However, the distortions were not clinically significant under the study's limitation. In contrast, angle deviation was unrelated to the inter-implant distance. The clinically significant angle deviation from using intra-oral scanners is possible in the partially edentulous arch. IMPLICATION OF THESIS. The study will help to understand the limitation of intra-oral scanners used to scan partially edentulous sites. This would be helpful to dentists to carefully consider using and choosing intra-oral scanner to proceed implant restoration. In addition, understanding the factor of inter-implant distances can also lead to the future study to improve the accuracy of intra-oral scanner. This will be both beneficial to patient, such to avoid prosthetic misfit and promote long-term stability, and develop new scanning technique to enhance the accuracy

Mahidol University. Mahidol University Library and Knowledge Center

Address: NAKHONPATHOM

Email: liwww@mahidol.ac.th

Name: Chuchai Anunmana

Role: Thesis Advisors

Name: Sirichai Kiattavorncharoen

Role: Thesis Advisors

Created: 2021

Modified: 2025-05-29

Issued: 2025-05-29

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Implant Dentistry

Grantor: Mahidol University

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