Abstract
This study evaluated heat-polymerized (HPR) and microwave-polymerized acrylic resins (MPR), after immersion in water, 1% hypochlorite and Ricinus communis solution (RC). Knoop hardness, color alteration, roughness and flexural strength tests were performed after obtaining the specimens and after time intervals of 15 (T15) and 183 (T183) days. Variations in data (Δ) were submitted to ANOVA and Tukey tests (P = 0.05). For ΔT15 HPR there was greater variation in hardness when immersed in water (P = 0.00) and for MPR, after immersion in RC (P = 0.00). RC caused the greatest variation in roughness (P = 0.015). Color alteration was not significant (P = 24.46). Hypochlorite caused a decrease in flexural strength (P = 0.37). After ΔT183, hypochlorite and RC caused a decrease in HPR hardness value (P = 0.00). MPR showed the greatest variation in roughness (P = 0.01). HPR presented the most color alteration after immersion in RC (P = 0.214). Hypochlorite and RC caused the lowest flexural strength values for MPR (P = 0.89). RC caused alterations in resin properties, and was not shown to be superior to hypochlorite.
Highlights
Denture care is indispensable for maintaining general health, in elderly patients who cannot brush their dentures adequately because of disease, dementia and poor dexterity
Some authors have concluded that the daily use of denture cleanser can affect the properties of denture acrylic resin[4]
An experimental solution of 2% Ricinus communis was prepared as denture cleanser and the purpose of this study was to evaluate the effect of this new solution on hardness, roughness, color alteration and flexural strength of a microwave-polymerized acrylic resin and a conventional heat polymerized acrylic resin after long periods of immersion
Summary
Denture care is indispensable for maintaining general health, in elderly patients who cannot brush their dentures adequately because of disease, dementia and poor dexterity. An ideal denture cleanser should have bactericidal and fungicidal properties, be simple to use, effectively remove organic and inorganic matter from denture surfaces, and be compatible with all denture materials[3]. It is of clinical importance to determine whether denture cleansers alter the properties of acrylic resins. Some authors have concluded that the daily use of denture cleanser can affect the properties of denture acrylic resin[4]. The surface roughness is of great clinical relevance since it can affect biofilm formation and make it difficult to remove[6]. Hardness is another relevant acrylic resin property, since it shows whether a material has softened over time. Immersion in denture cleansers and disinfectant solutions may decrease the flexural strength of acrylic resins[8,9]
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