Purpose: This study aimed to assess and compare the color stability, flexural strength (FS), and surface roughness of occlusal splints fabricated from heat-cured acrylic resin, milled polymethyl methacrylate (PMMA)-based resin, and 3D-printed (PMMA) based-resin.
Materials And Methods: Samples of each type of resin were obtained, and baseline measurements of color and surface roughness were recorded. The specimens were divided into three groups (n = 10) and subjected to distinct aging protocols: thermomechanical cycling (TMC), simulated brushing (SB), and control (without aging). Final assessments of color and surface roughness and three-point bending test (ODM100; Odeme) were conducted, and data were statistically analyzed (2-way ANOVA, Tukey, <.05).
Results: Across all resin types, the most significant increase in surface roughness (Ra) was observed after TMC ( < .05), with the 3D-printed resin exhibiting the lowest Ra ( < .05). After brushing, milled resin displayed the highest Ra ( < .05) and greater color alteration (ΔE) compared to 3D-printed resin. The most substantial ΔE was recorded after brushing for all resins, except for heat-cured resin subjected to TMC. Regardless of aging, milled resin exhibited the highest FS ( < .05), except when compared to 3D-printed resin subjected to TMC. Heat-cured resin exposed to TMC demonstrated the lowest FS, different ( < .05) from the control. Under control conditions, milled resin exhibited the highest FS, different ( < .05) from the brushed group. 3D-printed resin subjected to TMC displayed the highest FS ( < .05).
Conclusion: Among the tested resins, 3D-printed resin demonstrated superior longevity, characterized by minimal surface roughness and color alterations. Aging had a negligible impact on its mechanical properties.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10625884 | PMC |
| http://dx.doi.org/10.4047/jap.2023.15.5.227 | DOI Listing |
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