Effects of post‐polymerization conditions on color properties, surface roughness, and flexural strength of 3D‐printed permanent resin material after thermal aging

Abstract

AbstractPurposeTo evaluate the color, surface properties, and flexural strength of 3D‐printed permanent crown resin subjected to different post‐polymerization conditions after artificial aging.Materials and MethodsNinety (10 × 2 mm) disc‐shaped specimens were printed by using permanent crown resin with SLA technology. Specimens were divided into nine different groups, subject to post‐polymerization conditions at three different times (15, 20, and 30 min) and three different temperatures (40, 60, and 80°C) (n = 10). Color and surface roughness measurements were repeated pre‐post thermal aging (5.000 cycles, 5–55°C) and a flexural strength test was carried out. Data were analyzed with Shapiro–Wilk, Kruskal–Wallis, ANOVA, Tukey HSD, and Dunn tests (α < 0.05).ResultsΔE00 values showed results below the acceptable color threshold, except for the 30 min 40°C group (ΔE00 <1.8). No difference was found between the relative translucency parameter and surface roughness values of the 20 min 60°C group recommended by the manufacturer and the other groups. A significant difference was found between the flexural strength values of the groups (p < 0.001).ConclusionsThe color properties, surface topography, and mechanical properties of the printed permanent crown material were affected by different post‐polymerization conditions: polymerized at different times and temperatures. Although the flexural strength and color change values showed promising results, more studies are required to evaluate its suitability for clinical use.