ผลของการปรับสภาพพื้นผิวพอลิเอไมด์ด้วยวิธีการต่าง ๆ ต่อความแข็งแรงยึดเฉือนระหว่างพอลิเอไมด์และพีเอ็มเอ็มเอ

Abstract

Objective: This study aimed to evaluate the effect of surface treatment on shear bond strength (SBS) between polyamide and denture base resin. Materials and methods: Polyamide surfaces were treated with 6 methods including (1) no treatment (control), (2) air abrasion with aluminum oxide 110 microns, (3) application of 5% acetic acid in ethanol, (4) application of 4-META resin, (5) air abrasion followed by acetic acid and (6) air abrasion followed by 4-META resin prior to bonding with autopolymerizing polymethylmethacrylate (PMMA) resin. All specimens were immersed in 37 Oc for one week before being divided into 2 groups: non-thermocycling and thermocycling at 10,000 cycles. Both groups were tested SBS and specified failure mode. Furthermore, the polyamide surfaces after each treatment method were evaluated for surface roughness, surface morphology, and functional groups. The SBS data were statistically analyzed using two-way ANOVA and Tukey HSD (P<0.05) while surface roughness data were statistically analyzed using one-way ANOVA and Dunnett T3 (P<0.05). Results: Air abrasion followed by 4-META resin yielded the highest SBS in both thermocycling and non-thermocycling groups and had the highest surface roughness. The SBS from applying acetic acid or 4-META resin was not significantly different from the control. Conclusion: Within the limitation of the study, polyamide surface treated with air abrasion followed by 4-META resin is the most effective method to improve SBS to denture base resins. Keywords: Surface treatment, Shear bond strength, Polyamide, Denture base resins