Characterization of 3D printing resins for definitive indirect restorations

Abstract

Objective: To analyze the physicochemical, mechanical, and biological properties of resins used for definitive esthetic indirect restorations manufactured by 3D printing.

Methods: Two 3D printing resins will be evaluated: Varseo Smile Crown plus (Bego) and priZma 3D Bio Crown (Makertech Labs). As reference materials for comparison, two polymer-based materials will also be tested: a direct resin composite Z250 XT (3M ESPE) and an indirect composite resin SR NEXCO (Ivoclar-Vivadent). Flexural strength and elastic modulus will be analyzed using a three-point bending test (n=10). Color stability will be assessed through a coffee pigmentation test using a VITA Easyshade V® spectrophotometer (n=5). Adhesive strength to a resin cement will be evaluated using the microshear bond strength test (n=5), both immediately and after 6 months of aging. Biocompatibility will be analyzed via a cell viability assay using MTT (n=5). All statistical analyses will be performed with SigmaPlot 12 (Systat Software Inc., San Jose, CA, USA), using a significance level of α=0.05.

Expected Results: No significant differences are expected in the properties of the 3D printing resins compared to the direct and indirect composite resins.