Deterioration of polymethyl methacrylate dentures in the oral cavity
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Polymethyl methacrylate (PMMA)-made prostheses used in the oral cavity were evaluated by multimodal assessment in order to elucidate the biodeterioration of PMMA. In used dentures (UD), the micro-Vickers hardness of the polished denture surface and denture basal surface was lower than that of the torn surface (<i>p</i><0.05), whereas the shaved surface approximately 100 µm from the polished surface showed a similar value to the torn surface. By contrast, there were no differences among these surfaces in new resin (NR). The volatile content of UD was higher than that of NR (<i>p</i><0.05). Component analysis by ATR-FTIR showed specific spectra (1,700–1,400 cm<sup>−1</sup>) only in UD. This study revealed that PMMA deteriorated during long-term use in the oral cavity in terms of hardness and volatile content with component alteration, and suggests the involvement of biodeterioration, possibly due to saliva and oral microbiota.
- Dental Materials Journal
Dental Materials Journal 34(2), 234-239, 2015
The Japanese Society for Dental Materials and Devices