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KMID : 1023820230150050227
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The Journal of Advanced Prosthodontics
2023 Volume.15 No. 5 p.227 ~ p.237
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Effect of artificial aging on mechanical and physical properties of CAD-CAM PMMA resins for occlusal splints
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Julia Correa Raffaini
Eduardo Jose Soares
Rebeca Franco de Lima Oliveira
Rocio Geng Vivanco
Ayodele Alves Amorim
Ana Lucia Caetano Pereira
Fernanda Carvalho Panzeri Pires-de-Souza
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Abstract
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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, P <.05).
RESULTS
Across all resin types, the most significant increase in surface roughness (Ra) was observed after TMC (P < .05), with the 3D-printed resin exhibiting the lowest Ra (P < .05). After brushing, milled resin displayed the highest Ra (P < .05) and greater color alteration (ΔE00) compared to 3D-printed resin. The most substantial ΔE00 was recorded after brushing for all resins, except for heat-cured resin subjected to TMC. Regardless of aging, milled resin exhibited the highest FS (P < .05), except when compared to 3D-printed resin subjected to TMC. Heat-cured resin exposed to TMC demonstrated the lowest FS, different (P < .05) from the control. Under control conditions, milled resin exhibited the highest FS, different (P < .05) from the brushed group. 3D-printed resin subjected to TMC displayed the highest FS (P < .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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KEYWORD
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Computer-Aided Design, Occlusal splints, Color, Flexural strength, Polymethyl Metacrylate, Aging
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