Influence of post-printing cleaning solutions on the occlusal wear and fracture resistance of 3D printed resin-based crowns after thermomechanical aging.
TL;DR
The SR resin demonstrated superior wear resistance compared with the TR resin, and the effect of cleaning solutions on fracture resistance was dependent on both resin type and aging condition, with significant differences observed only in aged SR specimens.
Abstract
STATEMENT OF PROBLEM Evidence concerning the influence of post-printing cleaning solutions and thermomechanical aging on the fracture and wear resistance of 3-dimensionally (3D) printed resin-based definitive crowns is limited.
Purpose
The purpose of this in vitro study was to assess the influence of different post-printing cleaning solutions on the occlusal wear and fracture resistance of 3D printed resin-based crowns after thermomechanical aging. MATERIAL AND
Methods
Maxillary first molar crowns were fabricated from a urethane acrylate-based resin (TR) and a glass-filled composite-based resin (SR) (n=80 each). Crowns were cleaned with 98% isopropyl alcohol (IPA), 96% ethanol (ETA), a water-based solution (WTR), or a methyl-ether-based solution (SLV) (n=20 per subgroup). Half of the specimens in each subgroup (n=10) underwent thermomechanical aging and were used for occlusal wear analysis followed by fracture testing, whereas the remaining specimens (n=10) were used for fracture testing without aging. The crowns assigned to thermomechanical aging were scanned before and after aging, and maximum wear depth and volume loss were calculated using a 3D analysis software program. All specimens (N=160) were subjected to fracture testing, and the fracture load values were recorded. The data were analyzed using 2-way and 3-way factorial ANOVA models. The Tukey post hoc test was applied for wear analyses, and Bonferroni-adjusted pairwise comparisons based on estimated marginal means were used for fracture resistance (α=.05).
Results
The TR resin showed significantly greater maximum wear depth and volume loss than the SR resin (P<.001). SLV resulted in higher maximum wear depth compared with ETA and WTR (P<.05), while cleaning solution did not significantly affect volume loss. Fracture load was significantly reduced after aging (P<.001), and a significant 3-factor interaction was found (P=.004). Differences among cleaning solutions were observed only in aged SR specimens.
Conclusions
The SR resin demonstrated superior wear resistance compared with the TR resin. Cleaning solutions influenced maximum wear depth but did not affect volume loss. The effect of cleaning solutions on fracture resistance was dependent on both resin type and aging condition, with significant differences observed only in aged SR specimens.