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Effect of Cut-Out Rescan Procedures on the Accuracy of an Intraoral Scanner


Now online in the Journal of Prosthodontics, a report of cut-out rescan procedures and their effect on the accuracy of a digitized ear model.

The artificial replacement of a missing ear is a challenging task due to difficulties in restoring the anatomical structure via traditional methods. In addition, the impression-taking process has been described as invasive and uncomfortable for patients, and movement during the lengthy process may result in an inaccurate topography map.

The purpose of this in vitro study was to evaluate the impact of the rescanning of mesh holes of different diameters on the accuracy of an intraoral scanner (IOS) used to digitize an ear model.

The ear model was digitized using an intraoral scanner (Medit i500) to obtain a reference mesh. A baseline experimental scan was created by editing a duplicate of the reference mesh using the cut-out tool of the IOS software. Three equal groups were created based on the diameter of the cut-out areas: 2 mm 5 mm, and 8 mm (n = 15). The cut-out areas were rescanned and a total of 45 digital files were exported.

The discrepancy between the reference and the experimental digital scans was measured using the root mean square calculation (RMS). There were significant differences in the RMS error values among the groups tested. Mesh hole rescanning affected the scanning accuracy (trueness and precision) of the IOS tested. The larger the diameter of the mesh holes, the less the trueness of the IOS tested. The precision values seemed to be less affected compared with the trueness by the cut-out and rescanning procedures.

Ali IE, Hattori M, Sumita YI, Wakabayashi N. Effect of cut-out rescan procedures on the accuracy of an intraoral scanner used for digitizing an ear model: An in vitro study. J Prosthodont. 2022; 1– 7. https://doi.org/10.1111/jopr.13591


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