Research and EducationOptical properties and surface roughness of prepolymerized poly(methyl methacrylate) denture base materials
Section snippets
Material and Methods
Three different brands of prepolymerized PMMA and a conventional heat-polymerized PMMA denture base material, as described in Table 1, were tested for color stability, relative translucency, and surface roughness before and after CTC. Six disk-shaped (10×2 mm) specimens were prepared for each resin material as follows: prepolymerized PMMA denture base materials were designed as standard tessellation language (STL) files, 10 mm in diameter, and milled by using a CAD-CAM milling system (M1 Wet
Results
Means and 95% confidence limits for color differences due to CTC for different acrylic materials are presented in Figure 1. The material tested was not found to affect these color difference values (dfnum=3, dfden=20, F-ratio=1.03, P=.401).
Means and 95% confidence limits for RTP values are presented in Figure 2 for all subgroups. ANOVA for these data are provided in Table 2 and revealed significant interactions between the material and CTC. For each material, no significant differences were
Discussion
The first null hypothesis, that the material would not affect the color change due to CTC, was accepted as the material was not found to have an effect on this color change and the mean color difference for each material after CTC was below the perceptibility threshold.23 The second null hypothesis that neither material nor CTC would affect the relative translucency was rejected because of the significant interaction between the material and CTC on the relative translucency of the materials
Conclusions
Within the limitations of this in vitro study, the following conclusions were drawn:
- 1.
Material was not found to affect the color change due to coffee thermocycling (CTC) after 5000 cycles. All materials studied had imperceptible color changes after this CTC.
- 2.
The Merz Dental GmbH prepolymerized PMMA material had the lowest relative translucency values before and after CTC.
- 3.
The surface roughness of the specimens was higher after CTC regardless of the material.
- 4.
All tested denture base materials had a
Acknowledgments
The authors thank Merz Dental GmbH for supplying the materials used in this study.
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