Effect of repair methods and materials on the flexural strength of 3D-printed denture base resin.

Autor:	Viotto HEDC; Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil., Silva MDD; Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil., Nunes TSBS; Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil., Coelho SRG; Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil., Pero AC; Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil.
Jazyk:	angličtina
Zdroj:	The journal of advanced prosthodontics [J Adv Prosthodont] 2022 Oct; Vol. 14 (5), pp. 305-314. Date of Electronic Publication: 2022 Oct 28.
DOI:	10.4047/jap.2022.14.5.305
Abstrakt:	Purpose: The aim of this study was to evaluate the flexural strength of a 3D-printed denture base resin (Cosmos Denture), after different immediate repair techniques with surface treatments and thermocycling. Materials and Methods: Rectangular 3D-printed denture base resin (Cosmos Denture) specimens (N = 130) were thermocycled (5,000 cycles, 5℃ and 55℃) before and after the different repair techniques (n = 10 per group) using an autopolymerized acrylic resin (Jet, J) or a hard relining resin (Soft Confort, SC), and different surface treatments: Jet resin monomer for 180 s (MMA), blasting with aluminum oxide (JAT) or erbium: yttrium-aluminum-garnet laser (L). The control group were intact specimens. A three-point flexural strength test was performed, and data (MPa) were analyzed by ANOVA and Games-Howell post hoc test (α = 0.05). Each failure was observed and classified through stereomicroscope images and the surface treatments were viewed by scanning electron microscope (SEM). Results: Control group showed the highest mean of flexural strength, statistically different from the other groups ( P < .001), followed by MMA+J group. The groups with L treatment were statistically similar to the MMA groups ( P > .05). The JAT+J group was better than the SC and JAT+SC groups ( P < .05), but similar to the other groups ( P > .05). Adhesive failures were most observed in JAT groups, especially when repaired with SC. The SEM images showed surface changes for all treatments, except JAT alone. Conclusion: Denture bases fabricated with 3D-printed resin should be preferably repaired with MMA+J. SC and JAT+SC showed the worst results. Blasting impaired the adhesion of the SC resin. (© 2022 The Korean Academy of Prosthodontics.)
Databáze:	MEDLINE
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