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Direct surface pH determinations of setting cements.

D G Charlton1, B K Moore, M L Swartz

  • 1Department of Dental Materials, Indiana University School of Dentistry, Indianapolis 46202.

Operative Dentistry
|November 1, 1991
PubMed
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The study measured the surface pH of dental materials over 24 hours. Water-mixed glass-ionomer cements exhibited lower pH, potentially causing post-treatment sensitivity.

Area of Science:

  • Dental Materials Science
  • Biomaterials Chemistry

Background:

  • Dental cements and liners are crucial for restorations.
  • Understanding their surface pH is vital for biocompatibility and patient comfort.
  • Acidity of materials can impact surrounding tooth structure and cause sensitivity.

Purpose of the Study:

  • To measure and compare the surface pH of various luting cements and glass-ionomer lining/restorative materials over a 24-hour period.
  • To investigate the relationship between material type, pH, and potential clinical implications like post-treatment sensitivity.

Main Methods:

  • Surface pH was monitored for 24 hours for multiple dental materials.
  • Materials included water-mixed glass-ionomer luting cements, polycarboxylate cements, and glass-ionomer lining/restorative materials.

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  • pH measurements were taken at intervals throughout the 24-hour testing duration.

    • Main Results:

    • Ketac-Cem (water-mixed glass-ionomer) showed the lowest initial pH, while Durelon (polycarboxylate) had the highest.
    • Significant pH differences emerged over 24 hours for three glass-ionomer lining materials.
    • Two visible-light-cured glass-ionomer liners had similar pH, but a third displayed a considerably lower pH.

    Conclusions:

    • Water-mixed glass-ionomer luting agents demonstrate lower surface pH values.
    • The acidity of these materials may be a contributing factor to post-treatment sensitivity experienced by patients.
    • Material selection and understanding pH profiles are important for clinical success and patient management.