Are there differences between comparison methods used to evaluate the accuracy and reliability of digital models?

Abstract

Objectives: The accuracy and reliability of plaster models and digital models acquired with two different surface laser scanners were tested by means of three methods: measurement with calipers, digital measurement with proper software and superimposition of the digital models. Methods: Thirty plaster models with permanent dentition that met the inclusion criteria were selected and scanned with two laser scanners (R700 and Xcad). Three examiners measured distances on plaster models with a digital caliper and on digital models using Ortho Analyzer software. The digital models were also compared by means of superimposition of the models using the Geomagic Qualify software. The intra and inter-examiner reliability of the measurements were evaluated using the ICC. Paired t test was used to test the accuracy of the measurements on digital and plaster models.Results: The measurements on plaster and digital models acquired by two different scanners showed high values for the ICC. Although statistically significant differences between the measurements on plaster and digital models have been found, these discrepancies were not considered clinically relevant. The superimposition method with Geomagic Qualify software showed that the two digital models were not significantly different.Conclusions: Digital models created from scanned plaster models using the R700 or Xcad scanners were clinically accurate according to the two methods of comparison used.

Investigation into the accuracy and measurement methods of sequential 3D dental scan alignment

“…Digital 3D scanning, superimposition and comparison, has been used to quantify changes in orthodontics [1,2], periodontics [3,4] and tooth wear [5] measurements, with varying degrees of accuracy. When assessing the accuracy of the 3D comparison process, the majority of literature has focused on the reproducibility error of obtaining the 3D datasets either indirectly via sequential dental models [5][6][7][8] or directly using digital scanners.…”

Toward an “Ancient” Virtual World: Improvement Methods on X-ray CT Data Processing and Virtual Reconstruction of Fossil Skulls

“…For increasing voxel size (see Table 1, voxel size "processed"), using the same pathway for converting non-isotropic to isotropic voxel. We performed these processes in ImageJ (Rueden et al, 2017) using the bicubic interpolation method (Maret et al, 2012;Parsania and Virparia, 2016;Camardella et al, 2017;Rajarapollu and Mankar, 2017; Figure 5C). Increasing first the pixel size and then the voxel size is recommended.…”

New Approach to Dental Morphometric Research Based on 3D Imaging Techniques

“…This can be compared to some extent with postage service and e-mail; both allow sending texts and documents; however, digital ways effectively cover a major part of correspondence today. Returning to the issue of dental research, in some cases, we can observe reproductions of conventional techniques on digital reconstructions [7]; in others-imaging techniques provide obtaining previously unattainable and detailed data (such as accurate reconstructions of inner dental morphology obtained through micro-CT scanning). The above-mentioned examples are characterized by contribution of digital approaches into morphological studies or technological processes.…”