Evaluation Of Static Friction And Effect Of Anti S. Mutans Of Metal Brackets Coating By Silver Nanoparticles By Physical Vapor Deposition (Pvd)

Background and objective: Because silver is known for its anti-bacterial properties. The aim of this study was to evaluate the performance of antibacterial and static friction of steel orthodontic brackets coating by silver nanoparticles.Materials and Methods: 48 pcs stainless steel brackets into three groups of 16brackets uncoated, coated with silver 60nm and 100 nm. Coatingvia Pvd method was performed. 3 brackets for friction testing of each group was randomly selected and tested. AFM and SEM method to check the adequacy of the coating process was performed on the coated brackets. Antibacterial tests used include disk diffusion test and had direct contact which was measured using Streptococcus mutans. Colonies were counted after 3,6,24 and 48 hours. Results via Software 18SPSS v and test Krus kalwalis and repeated measures ANOVA and Mann Whitney U test were analyzed.Findings: The friction values of the control group, silver -60and silver -100 respectively 0.55 +/- 0.14,0.77 +/- 0.08,0.82 +/- 0.11 and there is no significant difference was observed between the control group and groups coating with silver (p =0.07) in disk diffusion test in agar environment no significant difference between case and control groups was observed. While the direct contact test brackets coated with silver, significantly reduced the growth of bacteria (P <0.05) but in brackets without covering a number of bacteria increased sharply. Conclusion: steel brackets coating via silver by PVD method, anti-bacterial ability to make direct contact with the bacteria Streptococcus mutans is not significant and increasing friction.