Comparative study on the accuracy of extraoral scanning versus intraoral scanning in digital impressions for implant restoration in edentulous jaws.
10.7518/hxkq.2025.2025077
- Author:
Yongtao YANG
1
;
Xin LI
2
;
Xiangyi SHANG
1
;
Shenyao SHAN
1
;
Wenbo LI
1
;
Qingzhao QIN
3
;
Yong WANG
3
;
Yijiao ZHAO
1
Author Information
1. Institute of Medical Technology, Peking University Health Science Center, Beijing 100191, China.
2. Dept. of Oral Implantology, Affiliated Hospital of Qingdao University, School of Stomatology, Qingdao University, Qingdao 266100, China.
3. Center of Digital Dentistry Central Laboratory/Dept. of Prosthodontics, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & NHC Key Laboratory of Digital Stomatology (Key Laboratory of Digital Stomatology, Chinese Academy of Medical Sciences) & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
- Publication Type:English Abstract
- Keywords:
accuracy;
digital impression;
edentulous implant;
intraoral scan;
stereophotogrammetry
- MeSH:
Jaw, Edentulous;
Humans;
Dental Impression Technique;
Dental Implants;
Imaging, Three-Dimensional/methods*;
Photogrammetry/methods*;
Models, Dental
- From:
West China Journal of Stomatology
2025;43(6):771-779
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVES:To evaluate the accuracy of a self-developed extraoral scanning system based on four-camera stereophotogrammetric technology in the acquisition of three-dimensional positional information on dental implants and conduct a comparative study involving an intraoral scanning system.
METHODS:With the use of an in vitro edentulous jaw model with implants, extraoral (experimental group) and intraoral (control group) scanning systems were employed to obtain STL (Standard Tessellation Language) datasets containing three-dimensional morphological and positional information on scan bodies. In addition, a dental model scanner was used to obtain reference data. The three-dimensional morphological, linear, and angular deviations between groups and reference data were analyzed using Geomagic Wrap 2021 software to compare trueness and precision.
RESULTS:The extraoral scanning system demonstrated superior trueness in three-dimensional morphological, linear, and angular deviations compared with the intraoral scanning system, with statistically significant differences (P<0.001). The extraoral scanning system also showed a higher precision in three-dimensional morphological deviation (P<0.001). As the number of implants increased, the extraoral scanning system exhibited increased three-dimensional morphological and linear deviations (P<0.001) but maintained a stable angular deviation. The intraoral scanning system displayed significant increases in three-dimensional morphological, linear, and angular deviations with the increase in the number of implants (P<0.05).
CONCLUSIONS:The stereophotogrammetry-based extraoral scanning system outperforms intraoral scanning system in terms of the accuracy for multi-unit implant positioning and provides a novel approach for attaining a fully digital workflow for implant rehabilitation in edentulous jaws.
