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Purpose: To evaluate the in vitro effects of the 3D printed Urethane dimethacrylate (3D-UDMA) resin flexural strength (FS) once repaired through different surface treatments and repair materials. Materials and methods: 20 milled Poly-methylmethacrylate (mPMMA) and 60 3D-UDMA 2 x 2 x 25 mm rectangular blocks are divided randomly into 8 different groups according to surface treatment and repair material (PmP: mPMMA + monomer + self-cured PMMA; UvP: UDMA + Visio.Link + self-cured PMMA; UvC: UDMA + Visio.Link + flowable composite; UeC: UDMA + etch & bond + flowable composite), and if they were thermocycled or not (PmPt; UvPt; UvCt; UeCt). FS was measured using a universal testing machine at 1 mm/minute. Failure (adhesive, cohesive within the original material, cohesive within the repair material, or mixed) was assessed under x3.5 magnification. FS data was analyzed using 2-way-ANOVA (a = 0.05). Results: For the FS within the non-thermocycled samples, there was a statistically significant difference between UvP and all other 3 groups. Within the thermocycled samples, there was only a statistically significant difference between UvPt and UeCt. For the mode of failure within the non-thermocycled there was a statistically significant difference between UeC and UvP and the control repair (PmP). For the mode of failure within the thermocycled samples, there was only a statistically significant difference between UvCt and PmPt. Conclusion: UDMA repaired with Visio.Link primer and self-cure PMMA had statistically significant lower FS compared to all other repairs. The repairs with highest FS were achieved with flowable composite repairs. |
