Influence of an experimental solution for complete denture cleaning on the physical properties of acrylic resins, artificial teeth and soft liners / Influência de uma solução experimental para higiene de próteses totais nas propriedades físicas e mecênicas de resinas acrílicas, dentes artificiais e reembasadores resilientes

Marina Xavier Pisani

This study evaluated conventional (RAC) and microwave-polymerized (RAM) acrylic resins, artificial teeth (Vipi, Biolux and Trilux) and soft liners (Elite Soft and Mucopren Soft) after immersion in 3 solutions: water, sodium hypochlorite 1%; experimental solution of Riccinus communis (RC). The Knoop hardness and color alteration of resins, and shore A hardness, roughness and color alteration of soft liners were analyzed in circulars specimens (15x3mm), roughness and flexural strenght, in rectangular specimens (10x65x3mm). Hardness and roughness of artificial teeth were measured on the flat palatine face and color in the vestibular face. Ten specimens of each material were randomly distributed in three groups. The tests were conducted after specimens obtention and after 15 and 183 days, simulating 3 years of daily immersions in 20 minutes and 18 months of daily immersions of 8 hours, respectively. A period of 7 days (18 months of daily immersions, 20 minutes) was added for soft liners. Data variation (ΔT) were submitted to ANOVA and Tukey (P = 0.05). For ΔT15 RAC underwent more variation in hardness when immersed in water (P = 0.00) and the RAM, after immersion in RC solution (P = 0.00). The RC solution caused the largest variation in roughness (P=0.015). All solutions caused roughness increase. Color alteration was not significant (P=24.46). Sodium hypochlorite caused a decrease in flexural strenght (P=0.37). After ΔT183, sodium hypochlorite and RC solution caused a decrease in RAC hardness (P=0,00). The RAM suffered the largest roughness variation (P=0.01). The hypochlorite caused an increase in roughness, but there was not differences between the solutions (P=2.84). RAC presented the largest color alteration after immersion in RC (P=0.214). Sodium hypochlorite and RC caused the lowest values of flexural strenght for RAM (P=0.89). In ΔT15, Vipi underwent hardness increase and Biolux, the highest variation (P=1.85). RC caused the highest variation and hardness increase (P=0.02). For roughness, RC caused the lowest variation, with an increase (P=0.54). Biolux presented the lowest color alteration (P=0.01). After ΔT183, Trilux underwent the highest hardness variation (P=0.00). RC caused the lowest variation (P=1,03). Biolux presented the highest variation, with an increase in roughness (P=0.001). There was not color variation (P=16.45). After T7, for hardness, Mucopren presented the highest variation (P=0.05); there was not differences between the solutions (P=47.28). The immersion in water and hypochlorite increased the roughness of Mucopren. The RC solution caused the lowest variation on this property (P=1.57). About color, Elite underwent the highest variation after immersion in hypochlorite; for Mucopren, RC caused the highest variation (P=0.00). In ΔT15, the materials suffered hardness increase. The highest variation occured for Mucopren associated with hypochlorite (P=0.33). Elite underwent most roughness variation than Mucopren. There was not statistics differences between the solutions (P=2.32). Both materials suffered color alteration after immersion in hypochlorite (P=0.00). After ΔT183, the highest hardness alteration was presented for Mucopren in all solutions. The RC caused the lowest variation (P=2.64). For roughness, Elite presented the highest variation (P= 3.72). Sodium hyochlorite and Riccinus communis was statistically equal (P=0.024). Hypochlorite caused the the highest color alteration for Elite and Riccinus communis for Mucopren. (P=0,001). The experimental solution caused alterations on the properties of all tested materials, showing no superiority to the positive control, regardless of the immersion period.

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