Effect of Immersion in Cu(II)-Natural Zeolite on Copper Sorption and Colour Stability of Acrylic Resins

摘要

Denture cleansers ideally are bactericidal, fungicidal and harmless to denture materials. Copper(II)-zeolites showed antimicrobial activities, but its effect on denture materials is unknown. The purpose of this research was to investigate the effect of immersion in copper(II)-zeolites on copper sorption and colour stability of acrylic resins. The copper(II)-zeolites (CuZA) were made by mixing natural zeolite (ZA) with 0.1 M, 0.2 M, 0.4 M, 0.6 M and 0.8 M CuCl2 solutions at 60 °C for 1 h. Acrylic resins specimens (20 mm x 20 mm x 2 mm) were immersed in natural zeolite and copper(II)-zeolites suspension in distilled water (70 mg/mL) for 60 days. The results showed that copper amount in acrylic resins varied from not detected (ZA group) to 2.82 ± 1.03 ppm (CuZA-0.1 group) and the △E*_(ab) (L*a*b) from 1.207 ± 0.155 (ZA group) to 1.584 ±0.313 (distilled water group). Variation of immersing suspensions did not influence the copper sorption and colour stability of acrylic resins (p > 0.05). Sixty days immersion in Cu(II)-natural zeolites did not afffect copper sorption and colour stability of acrylic resins.