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Evaluating the Mechanical Properties and Fracture Surfaces of Interim Restorative Materials Produced by Different
Purpose:
To compare the mechanical properties of interim restorative materials produced using stereolithography (SLA), digital light processing (DLP), and liquid crystal display (LCD) technologies with specimens produced by milling and conventionally manufactured polymethyl methacrylate (PMMA).
Materials And Methods:
Six different 3D printers-two brands for each of SLA (Formlabs [FL] and DWS Systems [DWS]), DLP (Asiga [AS] and Mega [MG]), and LCD (Vega [VG] and Photon [PH]) technologies-were used as experimental groups, and milling (Tempo-Cad, Ondent) and conventional (autopolymerizing PMMA, Imident, Imicryl) methods were used as controls. According to International Standards Organization (ISO) 10477:2004, 120 rectangular prism interim resin specimens with dimensions of 25 × 2 × 2 mm were prepared. The manufactured specimens were subjected to three-point bending and microhardness tests, and Weibull analysis was performed. Fracture surface analysis was performed using SEM (FEI Quanta 650). Statistical data analysis was performed with one-way ANOVA and post hoc Dunnett T3 test (α = .05).
Results:
The mean flexural strength value of the milling group was statistically significantly higher than all other groups (P < .05) except the FL group (P = 1.000). The mean elastic modulus values of DWS, FL, AS, VG, and conventional groups were not statistically significantly different from the milling group. All 3D-printer groups except PH showed a statistically significantly higher microhardness value than the conventional group.
Conclusions:
All the interim resin materials produced with six different 3D printers constituted a good alternative to the conventional method. However, only resin material produced with FL showed similar mechanical properties to the milling method.
