Effect of different surface treatments on shear bond strength of autopolymerizing repair resin to denture base materials processed with different technologies

• Published in: Journal of Prosthodontic Research Vol. 68; no. 4; pp. JPR_D_23_00149 - 557
• Main Authors: Gibreel, Mona, Perea-Lowery, Leila, Garoushi, Sufyan, Wada, Junichiro, Lassila, Lippo, Vallittu, Pekka
• Format: Journal Article
• Language: English
• Published: Japan Japan Prosthodontic Society 01.02.2024
• Subjects: 3D printing; Air abrasion; Bond strength; Denture base; Roughness; Bond strength; Denture base; 3D printing; Roughness; Air abrasion
• ISSN: 1883-1958; 2212-4632; 1883-9207
• DOI: 10.2186/jpr.JPR_D_23_00149

Purpose: To evaluate the effect of chemical, mechanical, and combination surface treatments on the shear bond strength (SBS) of autopolymerizing repair resins to conventional heat-cured, computer aided design (CAD)-computer aided manufacturing (CAM) milled, and three-dimensionally (3D) printed denture base materials.Methods: Specimens were fabricated and divided according to the surface treatment as follows: no surface treatment (control group), monomer treatment (monomer group), resin remover treatment (resin remover group), roughening with 180 FEPA grit abrasive paper followed by monomer treatment (180-grit plus monomer group), and air particle abrasion (air abrasion group). Autopolymerizing resin cylinders were attached before accelerated aging of the specimens in water at 100 °C for 16 h. The SBS was tested using a universal testing machine. Surface roughness was evaluated using a 3D optical profilometer. Scanning electron microscopy (SEM) and stereomicroscopy were used for surface analysis. Data was collected and analyzed using analysis of variance (ANOVA) and Kruskall–Wallis tests (α = 0.05).Results: The denture base material and surface treatment significantly affected the SBS. The milled Temp Basic Tissue demonstrated the highest SBS values across all surface treatments, whereas the two 3D-printed denture base materials exhibited the lowest SBS values.Conclusions: The bond strength of CAD-CAM-milled denture base resins to autopolymerizing repair resins is comparable to that of heat-cured resins. Surface roughening using air particle abrasion or 180-grit carbide paper can enhance the bond strength of the autopolymerizing repair resin to 3D-printed denture base materials.