International journal of implant dentistry
Agreement and reproducibility of intraoral scan- versus CBCT-based three-dimensional implant position assessment in the posterior mandible - a paired in vitro method-comparison study
By Hoene G, Shahpasand S, Waffenschmidt FK and 4 others.
Abstract
Background
Three-dimensional postoperative implant assessment is increasingly performed using intraoral scan (IOS) superimposition as a radiation-free alternative to cone-beam computed tomography (CBCT). However, it remains unclear to what extent IOS- and CBCT-based measurements agree and how reproducibility changes across posterior mandibular configurations.
Methods
In this paired in vitro method-comparison study, based on the experimental platform of a previous study, 60 implants placed at Fédération Dentaire Internationale (FDI) positions 35, 36, 45, 46 and 47 in bounded edentulous spaces (BES) and distal extension situations (DE) underwent three IOS-based and three CBCT-based postoperative assessments relative to the virtual plan using the Treatment Evaluation Tool of the planning software. Angular, mesiodistal, buccolingual, apico-coronal, and three-dimensional (3D) deviations at implant base and apex were recorded, resulting in 180 paired measurements. Agreement was assessed by Bland-Altman analysis, and within-method reproducibility by the within-implant standard deviation (Sw). IOS variability was additionally separated into within-scan and between-scan components. Non-parametric analyses were used for comparisons by indication and FDI position.