The Effect of Denture Cleanser in Color Stability of Heat-polymerized Acrylic Resin

Objectives: The aim of this study was to determine the color alteration of heat-polymerized acrylic resin immersed in different types of denture cleansers.

Methods: 28 disc shaped test specimens were prepared at 50x0.5 mm dimensions from Heat-Polymerized acrylic resin (Meliodent^®). All specimens were equally divided and separately immersed in 3 cleansing solution (Bony Plus^®, 0.5% lemongrass oil concentrated solution and 5% vinegar concentrated solution diluted with tap water 1:6 and control group (tap water). Soaking trial of 8 hours in 3 denture cleaners at the room temperature (24-28ºC) and then 16 hours in distill water at 37 °C in an incubator atternatively for 60 days as simulated use. Color changes measurement were made by Spectrophotometer (Ultrascan Colorquest^R XE). Mean ∆E were analyzed statistically by analysis of variance and Tukey’s test at 5% significant level.

Results: There were statistically significant difference (p<0.05) among the three groups as compared to the control.. The group of 0.5% lemongrass oil concentrated solution showed the greatest color change (∆E =7.42±1.59) whereas the group of 5% vinegar concentrated solution showed the least effect. However, there was no statistically significant difference (p>0.05) found between the group of 0.5% lemongrass oil concentrated solution and Bony Plus^®.
Conclusions: 5% vinegar concentrated solution diluted in tap water 1:6 showed the least effect in color change of heat-polymerized acrylic resin. The results suggest that 5% vinegar may be beneficial as it is readily available and economical to use as an agent to clean heat-polymerized acrylic denture