Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Original Paper
Deterioration of polymethyl methacrylate dentures in the oral cavity
Hiroshi MATSUOHanako SUENAGAMasatoshi TAKAHASHIOsamu SUZUKIKeiichi SASAKINobuhiro TAKAHASHI
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2015 Volume 34 Issue 2 Pages 234-239

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Abstract

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 (p<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 (p<0.05). Component analysis by ATR-FTIR showed specific spectra (1,700–1,400 cm−1) 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.

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© 2015 The Japanese Society for Dental Materials and Devices
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