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Accuracy of 3D printed models created by two technologies of printers with different designs of model base.


Authors:

Kenzo Shiozaki, DDS – Resident, Loma Linda Univeristy

Oraphan Rungrojwittayakul, DDS

Charles Goodacre, DDS, MSD

Brian Goodacre, DDS, MSD

Rajesh Swamidass, DDS, MSD

Jaime Lozada, DMD – Professor and Director, Loma Linda Implant department

Abstract:

Purpose of the Study: To evaluate the accuracy of three-dimensional (3D) printed models manufactured using two different printer technologies with different model base designs.

Methods: A Columbia maxillary typodont was scanned using a desktop scanner to generate the Standard Tessellation Language (STL) file as a control group. After the scanning procedure, the STL file was exported to Model Builder for designing the following 2 types of the model bases; 1.) solid base design; and 2.) hollow base design with a 2.0 millimeter thickness of the external shell. Each design was printed to produce 10 models using a Continuous Liquid Interface Production (CLIP) printer and a Digital Light Processing (DLP) printer. The following 4 groups were tested: 1.) CLIP with solid base (CS); 2.) CLIP with hollow base (CH); 3.) DLP with solid base (DS); and 4.) DLP with hollow base (DH). A total of 40 models were scanned using the same desktop scanner to generate the STL files for evaluation of the accuracy. All STL files were superimposed with the control STL file via surface matching software and a comparison was preformed using the 3D color mapping function and a 2D comparison of 48 points selected on the tested model. The data was collected by measuring the deviation between the tested model and the control group. The Kolmogorov-Smirnov test was used for normality distribution testing. Then, Kruskal-Wallis analysis was conducted to assess the overall statistical significance of differences among the tested groups (=.05)

Results: The median values for the deviated distance of the 4 tested group were 0.045 mm. (CH), 0.035 mm. (CS), 0.077 mm. (DH)and 0.077 mm. (DS). There were no statistically significant differences between the accuracy of the 2 groups when using the same printers regardless of the designs of model base (P>.05). However, when comparing the 2 printers using the same model base design and the two different designs of model base, there were statistically significant differences in accuracy (P < .05). The 3D printed models created using CLIP technology had higher accuracy than the DLP technology printer.

Conclusion: The accuracy of 3D printed models was affected by the printer technology regardless of whether the model base was solid or hollow. The CLIP technology printer produced significantly less variation from the reference model than the DLP printer. However, all of the 3D printed models were determined to exhibit a clinically acceptable level of accuracy based on the recorded dimensions being less than 100 micrometers different than the reference model.

Articles: Jin SJ, Kim DY, Kim JH, et al: Accuracy of Dental Replica Models Using Photopolymer Materials in Addictive Manufacturing: In Vitro Three-Dimensional Evaluation. J Prosthodont 2018; Jul2:1-6.18. Camardella LT, de Vasconcellos Vilella O, Breuning H: Accuracy of printed dental models made with 2 prototype technologies and different designs of model bases. Am J Orthod Dentofacial Orthop 2017;151(6):1178-1187.

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