The Journal of Advanced Prosthodontics

  • 제14권5호
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  • Pages.305-314
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  • 2022
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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Effect of repair methods and materials on the flexural strength of 3D-printed denture base resin

  • 투고 : 2022.08.03
  • 심사 : 2022.10.12
  • 발행 : 2022.10.31
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초록

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.

키워드

과제정보

The authors thank USP (University of Sao Paulo, School of Dentistry, Ribeirao Preto, Brazil) for the technical assistance with the thermocycling and laser application. The authors report no conflict of interest.

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