![]() For treatment planning and manufacturing of tooth-supported appliances, virtual models created with the iTero can be used. ![]() Intraoral scanning with the iTero is less accurate than model scanning with the iTero, suggesting that the intraoral conditions (saliva, limited spacing) contribute to the inaccuracy of a scan. Scanning with the iTero is less accurate than scanning with the D250. ![]() Intraoral and extraoral scanning with the iTero resulted in deviations at the facial surfaces of the anterior teeth and the buccal molar surfaces. Scanning with the D250 had the highest precision, with mean deviations of 10 μm, median deviations of 5 μm, and root mean square errors of 20 μm. Group 2 showed a higher precision, with mean deviations of 25 μm, median deviations of 18 μm, and root mean square errors of 51 μm. The greatest deviations and therefore the lowest precision were in group 1, with mean deviations of 50 μm, median deviations of 37 μm, and root mean square errors of 73 μm. Color-coded displays of the deviations allowed qualitative visualization of the deviations. Deviations between models were measured and expressed as maximums, means, medians, and root mean square errors for quantitative analysis. Repeated intraoral scanning was evaluated in group 1, repeated extraoral model scanning with the iTero was assessed in group 2, and repeated model scanning with the D250 was assessed in group 3. To assess precision, deviations between corresponding models were compared. A second model alignment was then performed along the closest distances of the surfaces (Artec Studio software Artec Group, Luxembourg, Luxembourg). Virtual models provided by each method were roughly aligned, and the model edges were trimmed with cutting planes to create common borders (Rapidform XOR Inus Technologies, Seoul, Korea). Stone cast models manufactured from the impressions were digitized 10 times with an extraoral scanner (D250 3Shape, Copenhagen, Denmark) and 10 times with the iTero. One patient received 10 full-arch intraoral scans with the iTero and conventional impressions with a polyether impression material (Impregum Penta 3M ESPE, Seefeld, Germany). The aims of this study were to evaluate the precision of digital intraoral scanning under clinical conditions (iTero Align Technologies, San Jose, Calif) and to compare it with the precision of extraoral digitization. Digital impression devices are used alternatively to conventional impression techniques and materials.
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