Effect of repair methods and materials on the flexural strength of 3D-printed denture base resin
10.4047/jap.2022.14.5.305
- Author:
Hamile Emanuella do CARMO VIOTTO
1
;
Marcela Dantas DIAS SILVA
;
Thaís Soares Bezerra SANTOS NUNES
;
Sabrina Romão Gonçalves COELHO
;
Ana Carolina PERO
Author Information
1. Department of Dental Materials and Prosthodontics, Araraquara Dental School, Univ Estadual Paulista (UNESP), Araraquara, São Paulo, Brazil
- From:The Journal of Advanced Prosthodontics
2022;14(5):305-314
- CountryRepublic of Korea
- Language:English
-
Abstract:
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°C and 55°C) 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.
