Accuracy of different tooth surfaces on 3D printed dental mo
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Few studies have been reported regarding the accuracy of 3D-printed models for orthodontic applications. The aim of this study was to assess the accuracy of 3D-printed dental models of different tooth surfaces.

Thirty volunteers were recruited from the hospital, and then their dental models were produced by means of oral scanning and a stereolithography-based 3D printer. Each printed model was digitally scanned and compared with the oral-scanned STL file via superimposition analysis. A color map was used to assess the accuracy of different surfaces (occlusal, buccal, lingual) of anterior and posterior teeth. The Tukey test was used to evaluate the differences between the superimposition.

Statistically significant differences were found in the average deviations of different tooth surfaces. The mean average absolute deviations of the occlusal surfaces of posterior teeth were greater than those of other surfaces. Percentages of points beyond the upper and lower limits of different tooth surfaces displayed the same results.

In this study, 3D-printed dental models were produced with the DLP technique from intra-oral scanning. Comparing the print errors of different surfaces of the anterior and posterior teeth of the 3D-printed model, the average deviation of the posterior dentition was more obvious than that of the anterior region. The occlusal surfaces of posterior teeth displayed greater deviations than other regions, especially in pits and fissures. This deviation should be taken into consideration in the implementation of digital orthodontics. Maybe it still not the time for digital models and 3D-printed models to fully replace the traditional models.

Source:https://bmcoralhealth.biomedcentral.com/articles/10.1186/s12903-020-01338-6
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