Accuracy of edentulous full‐arch implant impression: An in vitro comparison between conventional impression, intraoral scan with and without splinting, and photogrammetry

印象 扫描仪 牙科 口腔正畸科 医学 拱门 植入 牙弓 生物医学工程 数学 计算机科学 外科 人工智能 工程类 结构工程 万维网
作者
Jing Cheng,Haidong Zhang,Hailin Liu,Junying Li,Hom‐Lay Wang,Tao Xian
出处
期刊:Clinical Oral Implants Research [Wiley]
卷期号:35 (5): 560-572 被引量:16
标识
DOI:10.1111/clr.14252
摘要

Abstract Objectives The purpose of this in vitro study was to compare the trueness and precision of complete arch implant impressions using conventional impression, intraoral scanning with and without splinting, and stereophotogrammetry. Materials and Methods An edentulous model with six implants was used in this study. Four implant impression techniques were compared: the conventional impression (CI), intraoral scanning (IOS) without splinting, intraoral scanning with splinting (MIOS), and stereophotogrammetry (SPG). An industrial blue light scanner was used to generate the baseline scan from the model. The CI was captured with a laboratory scanner. The reference best‐fit method was then applied in the computer‐aided design (CAD) software to compute the three‐dimensional, angular, and linear discrepancies among the four impression techniques. The root mean square (RMS) 3D discrepancies in trueness and precision between the four impression groups were analyzed with a Kruskal–Wallis test. Trueness and precision between single analogs were assessed using generalized estimating equations. Results Significant differences in the overall trueness ( p = .017) and precision ( p < .001) were observed across four impression groups. The SPG group exhibited significantly smaller RMS 3D deviations than the CI, IOS, and MIOS groups ( p < .05), with no significant difference detected among the latter three groups ( p > .05). Conclusions Stereophotogrammetry showed superior trueness and precision, meeting misfit thresholds for implant‐supported complete arch prostheses. Intraoral scanning, while accurate like conventional impressions, exhibited cross‐arch angular and linear deviations. Adding a splint to the scan body did not improve intraoral scanning accuracy.
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