Accuracy Evaluation of Different Denture Bases Fabricated by 3D-Printing Technology

Objectives: 1. To compare surface adaptation of different denture bases fabricated by 3D printing technique. (Accuracy)
2. To determine the precision and reproducibility of different denture base material. (Precision)
Methods: A master model was scanned and CAD software was used to generate the design of the denture base. Five specimens for each group were fabricated by Carbon 3D printing technique using two different materials, Lucitone Digital Print Resin (Dentsply-Sirona) and Dentca Denture Resin(DENTCA, Inc., USA). After fabrication, the tissue surface of each denture base was scanned as well as the master cast to create an STL file using an optical scanner at the high resolution setting (inEos X5, Dentsply-Sirona). Each denture base file was superimposed on the master model file using 3D inspection software (Geomagic Control X, version 2019) to evaluate the accuracy of surface adaptation. The scan file of each denture base group was superimposed on each other to evaluate the precision and reproducibility within the group. Measurement of fit discrepancies was performed at 5 different areas; palatal floor, palatal slope, ridge crest, flange, and posterior palatal seal. The RMS of fit discrepancies between groups and individual denture base was analyzed using JMP. Analysis of variance (ANOVA) followed by Tukey’s multiple-comparison test (p < 0.05) was used to analyze the RMS data.
Results: The RMS values which indicate the measure of the magnitude of all deviation values is used to represent the value of deviation discrepancies in Table I. The deviations are also shown in the color maps with a tolerance of 0.1 mm.
Conclusions: Overall, Lucitone Digital Print is statistically significantly better than Dentca 3D printed dentures in terms of accuracy. However, there is no statistically significant difference in terms of reproducibility/precision.