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Denture adhesives--pH and buffering capacity.

W B Love1, S Biswas

  • 1University of Manitoba, Faculty of Dentistry, Winnipeg, Canada.

The Journal of Prosthetic Dentistry
|September 1, 1991
PubMed
Summary
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Many denture adhesives create acidic conditions, potentially harming natural teeth. Six of ten tested adhesives fell below the critical pH for hydroxyapatite, risking tooth demineralization with prolonged use.

Area of Science:

  • Dental materials science
  • Biomaterials
  • Oral health research

Background:

  • Denture adhesives are commonly used by individuals with dentures.
  • The pH of denture adhesives can impact oral health, particularly the integrity of natural tooth structures.

Purpose of the Study:

  • To measure the pH and buffering capacity of selected denture adhesives.
  • To assess the potential risk of hydroxyapatite dissolution caused by denture adhesives.

Main Methods:

  • pH determination of 10 denture adhesives in various dilutions with deionized water using a glass pH electrode.
  • Buffering capacity assessment using titration with sodium hydroxide.
  • Evaluation of pH stability over 2-hour and 24-hour periods.

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Main Results:

  • Six out of ten denture adhesives exhibited pH values below the critical pH for hydroxyapatite.
  • These low pH levels were maintained for up to 2 hours.
  • Tested denture adhesives demonstrated significant buffering capacity.

Conclusions:

  • Certain denture adhesives can create an acidic oral environment detrimental to natural teeth.
  • Prolonged contact with low-pH denture adhesives may lead to hydroxyapatite dissolution.
  • It is advisable to avoid denture adhesives with low pH when natural teeth are present.