The effect of a denture cleanser on the properties of a flexible thermoplastic resin / Hazem Mofreh Altarawneh
Purpose: This in-vitro study was carried out to evaluate the effect of a denture cleanser on the color stability, surface roughness, and the flexural modulus of a flexible polyamide thermoplastic denture base material, following immersion in a commercially available neutral peroxide enzymatic den...
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| Format: | Thesis |
| Published: |
2019
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| Online Access: | http://studentsrepo.um.edu.my/11536/ http://studentsrepo.um.edu.my/11536/4/hazem.pdf |
| Summary: | Purpose: This in-vitro study was carried out to evaluate the effect of a denture cleanser
on the color stability, surface roughness, and the flexural modulus of a flexible polyamide
thermoplastic denture base material, following immersion in a commercially available
neutral peroxide enzymatic denture cleanser. Materials and methods: Sixty (60)
rectangular specimens (64mm x 10mm x 3.3mm) of polyamide thermoplastic denture
base material (Vertex™ ThermoSens) were prepared and immersed in distilled water
(n=25) as control, and a denture cleanser (Polident 3 min™), simulating 180 days of usage
(n=25), 10 specimens were not immersed in any solution for baseline measurements.
Color measurements (∆E) were obtained using Spectrophotometer. The surface
roughness (Ra) was determined using an optical 3-dimensional (3D) surface analyzer.
Three-point bending test executed using a universal testing machine to measure the
flexural modulus∆E values were submitted to statistical analysis by means of One-sample
test, then the Paired sample test was used to compare the color parameters (L*, a*, b*).
The Ra values were analyzed using the Paired sample test. The flexural modulus values
were submitted to One-way ANOVA test. All the statistics were done at a significant
level of P=0.05 with the aid of the statistical program SPSS 20.0 (SPSS Inc., Chicago,
IL,USA). Results: Following the immersion in the denture cleanser, the mean of the color
changes (∆E) (0.75±0.47) showed statistically significant difference (p<0.05) compared
to the control group (0.27±0.21), however, it was classified as slight (0.5-1.5) when
quantified by the National Bureau of Standards (NBS). There was a significant increase
(p<0.05) in the surface roughness (Ra) was detected after the immersion. However, there
was no significant difference in the flexural modulus (p<0.05) between the control, the
test and non-immersed groups. Conclusion: The use of the neutral peroxide enzymatic
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denture cleanser Polident 3 min™ significantly increases the surface roughness of the
polyamide thermoplastic denture base material (Vertex™ ThermoSens), however, the
color changes were within the clinically accepted range, and the changes in the flexural
modulus of the material were not significant. |
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