The effect of scanning pathways on trueness and precision in full-arch optical impression

Abstract

Background In this study, we investigated the effects of differences in scanning pathways during optical impression on the trueness and precision of full-arch impressions. Methods Reference data were obtained using a laboratory scanner. All optical impressions were measured across the dental arch using TRIOS® 3 in four different pathways. The reference and optical impression data were superimposed using the best-fit method. The criteria for superimposition were based on the starting side of the dental arch (partial arch best-fit method, PB) and based on the full arch (full arch best-fit method, FB). The data were compared between the left and right molars (starting and ending sides). The scan deviations for trueness (n = 5) and precision (n = 10) were obtained for each group by calculating the root mean square (RMS) of the deviation at each measurement point. Visual observations using superimposed color map images revealed variations in trueness. Results There were no significant differences in scanning time or amount of scan data between the four scanning pathways. Trueness did not differ significantly among the four pathways with respect to the starting and ending sides, regardless of the superimposition criteria. Precision with PB was significantly different between scanning pathways A and B, and pathways B and C for the starting sides, and between scanning pathways A and B, and pathways A and D for the ending sides. In contrast, there was no significant difference between the starting and ending side in pathways for FB. Regarding PB, color map images showed a large error range in the direction toward the molar radius for the occlusal surface and cervical regions on the ending sides. Conclusion Differences in the scanning pathways did not affect trueness, regardless of the superimposition criteria. On the other hand, differences in the scanning pathways affected the precision of the starting and ending sides with PB. Scanning pathways B and D were more precise on the starting and ending sides, respectively.

Clinician- and Patient-Centred Outcomes of Digital Impressions in Infants with Cleft Lip and Palate: A Systematic Review

“…The findings of this systematic review, indicating comparable accuracy between digital and conventional impressions in infants with cleft lip and palate (CLP), are consistent with prior research that has indicated the potential of digital impressions in paediatric dentistry [ 45 ]. Nevertheless, the precise manner in which scanning techniques, such as the utilisation of a variety of scanners and scanning strategies and the implementation of smaller scanning tips, affect the accuracy of digital impressions remains uncertain, particularly with regard to their effect on the trueness and precision components of accuracy [ 46 , 47 ].…”

In Vitro Analysis of the Accuracy of the Use of Waste Zirconia Dust Compared With Optical Scanning Spray on Implant Abutment Models in Extraoral Scanning Protocol

“…In order for them to incorporate the speed and precision of digital dentistry, extraoral or lab scanners commonly play a major role [ 2 ]. The use of extraoral scanning of impressions and models has allowed for shorter laboratory time, providing prosthesis with accurate fit [ 3 ]. Digitally fabricated crowns are found to have increased patient comfort and long-term low cost [ 4 ].…”