Effect of artificial aging on mechanical and physical properties of CAD-CAM PMMA resins for occlusal splints.

Autor: Raffaini JC; Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil., Soares EJ; Department of Pediatric Dentistry, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil., Oliveira RFL; Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil., Vivanco RG; Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil., Amorim AA; Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil., Pereira ALC; Private practice, Brasilia, Brazil., Pires-de-Souza FCP; Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry - University of Sao Paulo, Ribeirão Preto, SP, Brazil.
Jazyk: angličtina
Zdroj: The journal of advanced prosthodontics [J Adv Prosthodont] 2023 Oct; Vol. 15 (5), pp. 227-237. Date of Electronic Publication: 2023 Oct 26.
DOI: 10.4047/jap.2023.15.5.227
Abstrakt: 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 (ΔE 00 ) compared to 3D-printed resin. The most substantial ΔE 00 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.
(© 2023 The Korean Academy of Prosthodontics.)
Databáze: MEDLINE
Externí odkaz: