engleski

Temporal dynamics of adhesion of dental biofilm bacteria to alloys of orthodontic appliances

Aim: The aim of this study was to determine the dynamics of adhesion of the most common dental biofilm bacteria to alloys used in orthodontics. Materials and methods: In an in vitro experiment, Streptococcus mutans, Streptococcus oralis, Veillonella parvula, and Aggregatibacter actinomycetemcomitans were incubated for four hours with nickel-titanium and stainless-steel orthodontic wires. The wires were then removed and bacteria were seeded on a hard nutrient medium. At the end of each experiment, number of colonies per mL was quantified. Results: Over time, bacterial adhesion generally increased, but the growth trend differed for each bacterium and for each alloy. Higher growth over hours was observed in S. mutans and A. actinomycetemcomitans, while in V. parvula and S. oralis it was lower. S. oralis has a higher initial increase in NiTi alloy. S. oralis and V. parvula have higher adhesion to steel, and S. mutans to NiTi. In A. actinomycetemcomitans, the adhesion is higher in the first two hours to steel wires, but in the third and fourth hour it is higher on NiTi. Finally, V. parvula has the highest adhesion to both alloys, and S. mutans has the lowest. Conclusion: The adhesion of bacteria to alloys of orthodontic appliances depends on the time, alloy and type of bacteria.

dental biofilm ; nickel-titanium ; orthodontics ; stainless steel

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