Clinical Evaluation of Accuracy and Speed Across Three Intraoral Scanners

Background and Objectives: To evaluate and compare the accuracy (trueness and precision) and scanning speed of three intraoral scanners: Medit i700, Primescan 1, and COXO DL-300P, under standardized clinical conditions, using a digitized high-precision analog impression as the reference. Materials and Methods: A patient requiring fixed prosthetic treatment on natural abutments (2.5, 2.7, 3.5, 3.8) was selected. Ten sequential full-arch scans were performed with each scanner in rotating order. Scanning time was recorded for each full-arch acquisition. Accuracy analysis focused on regions of interest: the upper jaw included abutments with adjacent mucosa, the lower jaw included only abutment surfaces. A VPS impression was taken, poured in type IV stone, and digitized with a high-accuracy desktop scanner to serve as the reference. All datasets were analyzed in Geomagic Control X, and statistics were performed using MedCalc (α = 0.05). Results: Upper Jaw (Abutments and Mucosa): The Medit i700 achieved the highest trueness (100.3 ± 6.6 µm), outperforming Primescan and COXO (p = 0.008). COXO showed the best precision, while Primescan demonstrated the greatest variability (p < 0.0001). Primescan produced the fastest scans (72.5 ± 3.8 s) (p = 0.001). Lower Jaw: (Abutment Surface Only): Medit yielded superior trueness (193.1 ± 63.4 µm) compared with Primescan and COXO (p = 0.005). Precision varied significantly among devices, with COXO presenting the greatest inconsistency (p = 0.0004). Scan times did not differ significantly (p = 0.068). Conclusions: Medit i700 demonstrated the highest trueness, Primescan delivered the fastest scans but variable results, and COXO showed acceptable but inconsistent precision.