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With the dynamic development and prominence of digital dentistry, it has become possible to apply new technologies clinically. Our studies included an evaluation of a student preparation validation software as well as the accuracy evaluation of popular intraoral scanners.
In the study of the Dental Teacher system, the objective was to examine the improvement in cavity preparation skills of students using the software compared to students who worked without digital assistance. Overall, the use of the preparation analysis system improved the cavity preparation skills of the students and made the solution of the task significantly simpler based on the feedback from the students.
To accurately evaluate the stitching mechanism used by intraoral scanners, we developed a new assay methodology based on the alignment of test and master samples in the area of the scanning origin. Digital impressions were created of pmma jaw models by using an intraoral scanner, which were compared with the master models using an evaluation software. Three basic series of measurements were made: the distance between identical points using the origin of the scan for alignment, the distance between identical points during the total surface best fit alignmet, and the total average deviation for total surface best fit alignmet. Deviation values were determined along the 3 axes of the specified coordinate system. The obtained results were also compared with each other, which showed that the new methodological method is more sensitive than the previous ones and is suitable for more accurate determination of the distortion kinetics.
The aim of the third study was to validate the new method developed earlier by comparing the trueness values of seven different IOS made impressions as well as the physical impression. Test impressions were made with intraoral scanners and precisional impression material, while the master model was made with an industrial reference scanner. Samples were matched at the scanning origin after the distances between identical points along the 3 axes of the coordinate system were registered. In the case of IOS, as the distance from the origin of the scan increased, the deviation also increased gradually, while this phenomenon was not observed in the case of the physical impression. The digital model
from the traditional impression showed the best deviation value, but most of the intraoral scans presented clinically acceptable results for the maxilla with retained teeth.
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