Newly Prepared Cleansing Agent and Highly Impact Acrylic Denture
Since the early 1940s, polymethyl methacrylate has become the most commonly used denture base material. Three properties that have contributed most to the success of this material as a denture base are excellent appearance, ease in processing, and ease in repair. An inherent disadvantage is the liability of an acrylic resin denture to break during service.
The aims of this study were to evaluate the effect of newly prepared and commercial denture cleaner on some properties (color stability, dimensional accuracy, indentation hardness, surface roughness, tensile strength, residual monomer, and water sorption) of highly impact acrylic denture base material by using artificial saliva cycle. Also, to evaluate the effect of immersion cycle (2 days, 7 days, and 30 days) on these prosperities.
Total specimens of this study were 692 specimens, whereas specimens of pilot study were 9 specimens. While specimens of main study were 680 specimens, it is divided into 8 groups according to type of solutions. The specimens were prepared from highly impact acrylic resin.
The results of the present study were analyzed statistically by (Mean ± standard deviation, paired t-test , ANOVA and Duncan’s multiple range test).
These results showed that, in comparison among denture cleanser solutions (EDTA, Soda+Citric Acid, Soda+Alum, Soda+H2O2, Soda+Vinegar, Corega, Lacalute, distilled water), there was a statistically significant difference at P≤ 0.05 in color L*,a*,b* in (Soda+Citric, Soda+Vinegar, and Lacalute) and significant in a*,b in (Soda+H2O2, Soda+Alum, Corega) and significant in L* in (EDTA) and significant difference in (residual monomer, water sorption, and indentation hardness). In tensile strength there was significant difference in all solutions' , and not significant in (Soda+H2O2 and Soda+Citric) and significant difference surface roughness in all solutions and not significant in (Soda+H2O2).
Also, there was a significant difference at P≤ 0.05 in 7 days, and 1 month in color L*, b* and only significant in color a*in 2 days
And there was a significant difference at P≤ 0.05 in dimensional accuracy, indentation hardness, surface roughness, and water sorption properties among different times of immersion cycle (2 days,7 days, and 1 month), while there was no significant difference in tensile strength, properties after 1months of immersion cycle.
The conclusions of this study showed that, among denture cleanser solutions, the (soda+H2O2) has the lowest effect on the color test, residual monomer test, dimensional accuracy test, indentation hardness test, surface roughness, tensile strength, water sorption test of highly impact acrylic denture base material in (2day, 7 day, and 1month)
Soda+alum, Corega, and lacalute had the highest effect on the color a* b* and surface roughness while EDTA had lowest effect on the color L*, a* b* and highest effect on indentation hardness test. lacalute solution show the highest effect in water sorption of highly impact acrylic.