Abstract
Acrylic soft lining materials possess good handling properties during mixing and excellent viscoelastic properties after setting. These properties after setting, however, deteriorate rapidly in the mouth, compared with those of silicone of fluoro soft lining materials. Therefore, we tried to improve the durability of acrylic soft lining materials in distilled water or artificial saliva at 37℃. The variation in viscoelastic properties of acrlyic soft lining materials with storage was markedly reduced by adding ethylmethacrylate or butylmethacrylate monomer (10〜20% in weight of conventional liquid components), and by changing the materials being photocured. Durability was evaluated in the materials, which had been immersed for 6 months in distilled water or artificial saliva at 37℃, using viscoelastic measurements or surface roughness test. The experimental soft lining materials showed considerably improvement in durability by introducing a photocuring technique.
