Inhibitory Mechanisms of S-PRG Eluate and S-PRG Filler against Volatilization of Hydrogen Sulfide

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  • OMAGARI Sami
    Department of General Dentistry, Fukuoka Dental College
  • TANIGUCHI Nao
    Department of Preventive and Public Health, Fukuoka Dental College Oral Medicine Research Center, Fukuoka Dental College
  • YOKOGAWA Yoshiyuki
    Graduate School of Engineering, Department of Mechanical and Physical Engineering, Osaka City University
  • YONEDA Masahiro
    Department of General Dentistry, Fukuoka Dental College
  • YAMAMOTO Shigeru
    Department of General Dentistry, Fukuoka Dental College
  • HANIOKA Takashi
    Department of Preventive and Public Health, Fukuoka Dental College
  • HIROFUJI Takao
    Department of General Dentistry, Fukuoka Dental College

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<p> Purpose: The aim of this study was to elucidate the inhibitory mechanism of a surface pre-reacted glass-ionomer (S-PRG) eluate and S-PRG filler against volatilization of hydrogen sulfide (H2S).</p><p> Methods: The immediate inhibitory activity of S-PRG eluate on H2S volatilization was assessed by mixing with a solution of sodium hydrogen sulfide (NaHS) in equal amounts for 5 min, and measuring the gaseous concentration of H2S by gas chromatography. Subsequently, changes in the concentration of H2S in the gaseous and liquid phases, as well changes in the pH in the liquid phase, were examined following the addition of S-PRG eluate, S-PRG filler, spherical silica, and potassium bicarbonate (KHCO3).</p><p> Results: S-PRG eluate inhibited 31.6% of H2S volatilization in the reaction mixed with NaHS solution but with no significant difference (p=0.065). Following the addition of S-PRG eluate to the H2S solution, the concentration of H2S was reduced by 20% in the gaseous phase and increased by 5% in the liquid phase. There was no change in the gaseous concentration of H2S in the reaction supplemented with spherical silica, whereas the gaseous concentration of H2S was reduced in the reaction supplemented with KHCO3, similar to that with S-PRG filler. The pH of the liquid phase was 5.77 in the H2S solution, 6.01 in that with spherical silica, 7.07 in that with S-PRG filler, and 8.50 in that with KHCO3.</p><p> Conclusion: The results of this study suggest that the inhibitory effect of S-PRG eluate and S-PRG filler on H2S volatilization might be due to their buffering ability.</p>

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