Bonding of auto-polymerized poly(methyl methacrylate) resin to polyamide thermoplastic resin

Hidemasa Shimpo, DMD, PhD and Chikahiro Ohkubo, DMD, PhD

Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama, Japan

Purpose: Auto-polymerized poly(methyl methacrylate) (PMMA) resin cannot be bonded to polyamide thermoplastic resin. This study evaluated the bonding strengths of auto-polymerized PMMA resin to nylon denture bases using adhesive agents.

Materials and Methods: The surfaces of polyamide thermoplastic resin plates were polished using abrasive paper and blasted with 50 μm alumina particles. An adhesive agent, 4-META/MMA-TBB resin (Super-Bond) was used on the surfaces under the following conditions: monomer + catalyst (4:1, Group 1), monomer + catalyst (8:1, Group 2), monomer + catalyst (4:1) + polymer (Group 3), monomer + catalyst (8:1) + polymer (Group 4), treatment with dichloromethane (Group 5), alumina-blasted (Group 6), without treatment (Group 7), and PMMA resin (Group 8). Auto-polymerized PMMA resin was poured into a Teflon ring and polymerized according to the manufacturer’s instructions. After polymerization, the specimens were stored in 37˚C distilled water for 24 hours. The specimens for each condition were thermo-cycled for 5,000 cycles. The tensile bond strengths were measured on an autograph at a crosshead speed of 2.0 mm/min. The data obtained (n = 13) were analyzed using a two-way ANOVA and Tukey’s multiple comparisons test (α = 0.05).

Results: The bonding strengths of Groups 1 to 4 were significantly higher than for Groups 5 to 7. No significant differences were found among Groups 1-4, although Group 3 had the highest bonding strengths.

Conclusion: Auto-polymerized PMMA resin will adhere to polyamide thermoplastic resin using 4-META/ MMA-TBB after alumina-blasting.
(Asian Pac J Dent 2019; 19: 65-69.)
Key Words: bond strength, 4-META/MMA-TBB resin, polyamide, thermoplastic resin