Evaluation of surface-modified orthodontic brackets with silver nanoparticles and its influence on bacterial inhibition – An in vitro study

Abstract

: Compared to other fixed orthodontic appliances, orthodontic brackets have a substantial impact on enamel demineralization. This demineralization is a result of organic acid production by various microorganisms, primarily from Streptococcus mutans and Lactobacillus acidophilus. Preventing white spot lesions and caries during orthodontic treatment presents a considerable challenge for clinicians. Silver exhibits broad-spectrum antimicrobial activity against various microorganisms, including Gram-positive and Gram-negative bacteria, certain viruses, fungi, protozoa, and antibiotic-resistant strains. As such, the purpose of this research is to investigate the antibacterial properties of orthodontic brackets coated with silver nanoparticles against Streptococcus mutans and Lactobacillus acidophilus. The study involved 80 stainless steel orthodontic brackets, which were divided into four groups, each containing 20 brackets. In each group, there were uncoated brackets serving as the control group, and the experimental group consisted of brackets coated with silver dioxide. Coating was done by physical vapor deposition with the help of RF Magnetron sputtering unit. Surface morphology and material composition was analyzed by SEM and EDS unit. Afterward, the brackets underwent microbiological tests to evaluate their antibacterial efficacy against Streptococcus mutans and Lactobacillus acidophilus.The study found that silver nanoparticle-coated stainless-steel brackets exhibited effective antibacterial properties against both Streptococcus mutans and Lactobacillus acidophilus when compared to the uncoated brackets. Silver nano particle coated SS brackets showed increased anti-bacterial effect towards S. mutans than L acidophilus.Using silver nanoparticles to coat orthodontic brackets represents an innovative and effective approach to prevent the formation of white spot lesions in patients receiving fixed orthodontic treatment. The antimicrobial properties of silver nanoparticles can combat bacteria like Streptococcus mutans and Lactobacillus acidophilus, responsible for enamel demineralization and the occurrence of white spot lesions. This advancement in bracket technology has the potential to significantly reduce the risk of enamel damage and improve overall oral health outcomes for orthodontic patients.