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Short- and Long-Term Influence of Fluoride-Containing Prophylactics on the Growth of Streptococcus mutans on Titanium Surface

Objectives:Acidic pH and high fluoride (F−) concentration impair the corrosion resistance of titanium (Ti). Caries-preventive products contain high amounts of F− and are applied at low pH. The purpose of this study was to evaluate whether fluoride applied in different forms has different short-, mid-, and long-term effects on the growth of the bacteria Streptococcus mutans. Materials and Methods:Ti discs with polished surface were treated with a rinse containing 0.025% olaflur, a gel containing 1.25% olaflur, or a 1% aqueous solution of NaF (pH 4.5), and they were incubated with S mutans for 21 days. Control discs did not get prophylactic treatment. Protein assay analysis was performed at regular intervals to estimate the amount of S mutans. Scanning electron microscopic (SEM) images were also taken. Results:Bacterial protein quantity became significantly different only by the 21st day. Fluoride in rinse and gel proved to be superior to NaF in aqueous solution or no treatment (P < 0.01 and P < 0.05, respectively). However, the discs treated with fluoride in gel showed signs of corrosion in SEM images. Conclusion:The results suggest that the use of fluoride-containing mouthwashes might be the best and safest oral hygienic choice for patients with oral implants. Furthermore, olaflur seems to be superior to NaF for long-term use at low pH.