IADR Abstract Archives
Intraoral Complete Arch Scans: Training Influence on Scanning Accuracy
Objectives: The objective of this in-vitro study was to investigate the influence of training on the scanning accuracy of intraoral complete arch scans (CAS) performed by first-time users. Therefore, a distinction was made between specific training (repeated scanning of the same complete arch) and non-specific training (use of an intraoral scanner for a sextant scan in the context of a CAD/CAM course integrated in the student curriculum).
Methods: Thirty-six students without experience in intraoral scanning were randomized in 3 groups (n=12 per group) according to the number of specific CAS training sessions: 3 sessions (3S), 2 sessions (2S), and 1 session (1S). During each session each student performed 10 scans of a mandibular model with teeth prepared to accommodate a 3-unit fixed partial denture as well as an inlay. For group 3S, 2 scan sessions (T0 and T1) were performed before the CAD/CAM course and 1 session (T2) thereafter. For group 2S, the first session was before (T0) and the second after (T2) the CAD/CAM course. Group 1S had a single CAS session after the CAD/CAM course (T2). The deviations between the digitized reference model and the intraoral scans were determined using Matlab R2015a (Mathworks) and Geomagic DesignX (3D Systems). Data were analyzed using SPSS Statistics 25 (IBM).
Results: For all groups specific training improved scanning accuracy across all scans. Non-specific training had a positive effect on the initial scanning accuracy. The mean absolute distance deviations (cross arch distance) for group 3S were 83.7 µm (T0), 67.8 µm (T1) and 63.4 µm (T2); for group 2S 78.9 µm (T0) and 60.5 µm (T2) and for group 1S 66.8 µm (T2).
Conclusions: Specific training can be highly recommended to perform CAS with high accuracy. In addition, non-specific training also leads to an improvement in scanning accuracy.
Methods: Thirty-six students without experience in intraoral scanning were randomized in 3 groups (n=12 per group) according to the number of specific CAS training sessions: 3 sessions (3S), 2 sessions (2S), and 1 session (1S). During each session each student performed 10 scans of a mandibular model with teeth prepared to accommodate a 3-unit fixed partial denture as well as an inlay. For group 3S, 2 scan sessions (T0 and T1) were performed before the CAD/CAM course and 1 session (T2) thereafter. For group 2S, the first session was before (T0) and the second after (T2) the CAD/CAM course. Group 1S had a single CAS session after the CAD/CAM course (T2). The deviations between the digitized reference model and the intraoral scans were determined using Matlab R2015a (Mathworks) and Geomagic DesignX (3D Systems). Data were analyzed using SPSS Statistics 25 (IBM).
Results: For all groups specific training improved scanning accuracy across all scans. Non-specific training had a positive effect on the initial scanning accuracy. The mean absolute distance deviations (cross arch distance) for group 3S were 83.7 µm (T0), 67.8 µm (T1) and 63.4 µm (T2); for group 2S 78.9 µm (T0) and 60.5 µm (T2) and for group 1S 66.8 µm (T2).
Conclusions: Specific training can be highly recommended to perform CAS with high accuracy. In addition, non-specific training also leads to an improvement in scanning accuracy.
