Deterioration of polymethyl methacrylate dentures in the oral cavity.
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.
Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 981-8575, Japan; Division of Oral Ecology and Biochemistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 981-8575, Japan.
Hiroshi
H
Matsuo
Hanako
H
Suenaga
Masatoshi
M
Takahashi
Osamu
O
Suzuki
Keiichi
K
Sasaki
Nobuhiro
N
Takahashi
D000368:Aged; D003764:Dental Materials; D003819:Denture Bases; D005260:Female; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D009055:Mouth; D018583:Pliability; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013499:Surface Properties
D003764:Dental Materials; D019904:Polymethyl Methacrylate