Evaluation of the Effect of Some Denture Cleansers on Hardness of Acrylic Denture Base and Teeth Materials

Abstract

Aims: To evaluate the effect of some commercially available new denture cleansers on the hardness
of acrylic denture base and teeth materials. Materials and method: Samples were prepared
from heat cured acrylic resin denture base material and teeth. After that, half of the samples for
each group were immersed for ½ hr per day in the denture cleanser throughout one month, the
other half of the samples immersed for 8 hr per day in the denture cleanser through one month.
The denture cleansers used are three solutions prepared freshly everyday for immersion of the
samples. The hardness of the samples were tested by using Vickers hardness tester, the mean is
taken for each group and evaluated by using one way analysis of variance test and Duncan's multiple
range test to compare the groups. Results: The results demonstrated that there were significant
differences in the hardness of acrylic resin denture base material with different denture
cleansers and duration of immersion (P < 0.0001), and there were significant differences in the
hardness of acrylic resin teeth with different denture cleansers and duration of immersion (P <
0.0001). The results also revealed that the cross linked teeth had a higher hardness value than the
acrylic resin teeth. Conclusions: The type of denture cleanser and duration of immersion had an
effect on the surface hardness of acrylic resin teeth and denture base materials. The cross linking
of acrylic resin materials increase the resistance of the material to the action of solvents.