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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Trueness of multichromatic versus monochromatic veneers printed using tilted stereolithography technology at
Nawal M Alharbi1, Reham B Osman2
1Associate Professor at Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Objectives:
To evaluate the influence of shade (monochromatic vs multichromatic) and build angle on the trueness of veneers printed using tilted stereolithography technology (TSLA).
Methods:
A maxillary central incisor typodont tooth model was prepared to receive a butt-joint full veneer with 0.3 mm labial and 2 mm incisal reduction. The preparation was digitized using laboratory scanner (T310; Medit) to design the veneer restoration. Sixty veneers were fabricated using Tilting Stereolithography (TSLA) 3D-printing technique (Dfab; DWS). Thirty veneers were printed in monochromatic shade (N = 30) (IrixMax monochromatic A2; DWS) and thirty veneers in multichromatic shade (N = 30) (A1-A3.5) using hybrid resin-ceramic material (IrixMax Photoshade A1-A3.5; DWS). In each group, three subgroups were defined based on the build angle (N = 10): 90°, 75° and 45° angles. Trueness was evaluated quantitatively and qualitatively using metrology software (Geomagic Control v2020; 3DSystems). Two-way Analysis of Variance (ANOVA) test with Tukey post hoc test for multiple comparisons were used to detect the differences in root mean square estimate (RMSE) between the test groups (α =0.05).
Results:
Two-way ANOVA revealed a statistically significant interaction between different build angles and material shade on RMSE in butt-joint veneer preparation design (P = .001). Multichromatic shade showed significantly higher RMSE values when printed at 45° (P=.010) compared to monochromatic one.
Conclusions:
Build angle and material shade have an influence on the trueness of veneers printed using TSLA technique. 45° build angle with multichromatic shade material resulted in the highest RMSE deviation values. Therefore, clinicians should be cautious with the selected print angle when printing a multichromatic resin-based veneers.
Statement Of Clinical Relevance:
Advances in material science and 3D-printers resulted in the introduction of a chairside TSLA 3D-printer that can be used for the fabrication of multichromatic, resin-based veneer restorations. Both build angle and material shade influence the dimensional accuracy of TSLA printed veneer restorations. To print highly accurate multichromatic restorations and increase the number of printed parts per print cycle, 45° build angle should be avoided.
