Ca pre-rinse greatly increases plaque and plaque fluid F

Area of Science:

• Dental Research
• Cariology
• Fluoride Chemistry

Background:

• Topical fluoride applications are crucial for preventing dental caries.
• Previous research indicates calcium (Ca) pre-treatment enhances salivary fluoride retention after sodium fluoride (NaF) rinses.

Purpose of the Study:

• To investigate the effect of calcium pre-treatment on fluoride (F) levels within dental plaque and plaque fluid.
• To determine if calcium enhances the uptake and retention of fluoride in plaque.

Main Methods:

• Thirteen participants underwent plaque accumulation and were rinsed with either NaF alone, Ca rinse alone, or Ca rinse followed by NaF rinse.
• Plaque samples were collected one hour post-rinse.
• Fluoride was extracted from plaque fluid and plaque residues using sequential buffers (pH 6.8, pH 4.8) and acid extraction.

Main Results:

• The combined Ca rinse/NaF rinse significantly increased total plaque fluoride by 12-fold compared to NaF rinse alone.
• Fluoride levels in plaque fluid were elevated 5-fold with the Ca rinse/NaF rinse protocol.
• All plaque extracts after the Ca rinse/NaF rinse showed substantially higher fluoride concentrations than those from the NaF rinse alone.

Conclusions:

• Calcium pre-treatment markedly increases fluoride concentration and retention in dental plaque and plaque fluid.
• These findings support the hypothesis that calcium pre-treatment can potentiate the cariostatic efficacy of topical fluoride agents.