Chemical, Morphological and Bacterial Adhesion Analysis of Orthodontic Wires Composed of Different Metallic Alloys


  • Maria Leticia Lopes Miguel Braga Department of Orthodontics, Araras Dental School, Herminio Ometto Foundation, FHO, 13607-339 Araras - SP, Brazil
  • Analia Gabriella Borges Ferraz-Facury Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, Unicamp, 13414-903 Piracicaba - SP, Brazil
  • Eduardo Martinelli Franco Department of Biosciences, Piracicaba Dental School, Unicamp, 13414-903 Piracicaba - SP, Brazil
  • Larissa Marcelino Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, Unicamp, 13414-903 Piracicaba - SP, Brazil
  • Luan dos Santos Menezes Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, Unicamp, 13414-903 Piracicaba - SP, Brazil
  • Ana Rosa Costa School of Dentistry of Piracicaba (UNICAMP), Department of Dental Materials, 13414-903 Piracicaba - SP, Brazil/Department of Orthodontics, Araras Dental School, Herminio Ometto Foundation, FHO, 13607-339 Araras - SP, Brazil
  • José Guilherme Neves School of Dentistry of Piracicaba (UNICAMP), Department of Materials, 13414-903 Piracicaba - SP, Brazil/ Department of Orthodontics, Araras Dental School, Herminio Ometto Foundation, FHO, 13607-339 Araras - SP, Brazil



Alloys, Orthodontics, Streptococcus mutans, Wire


The purpose of this study was to evaluate the chemical, morphological and bacterial adhesion characteristics of orthodontic arches composed of different metal alloys. The wire segments (n=10) were allocated to the following groups: G1) Tru-Chrome- Rock Mountain Steel Wire (Colorado-USA); G2) NiTi- Rock Mountain Wire (Colorado-USA); G3) TiMb Rock Mountain Wire (Colored-USA); G4) NbTi Gummetal- Rock Mountain Wire (Colorado-USA). The orthodontic arches were segmented (20mm) and sterilized by means of ultraviolet light. Using Confocal Laser Microscopy (CLM), the roughness of archwires were investigated. The metallic alloys composition was analyzed by means of Scanning Electron Microscopy/Energy-dispersive Spectroscopy (SEM/EDS). The S. mutans biofilm growth was performed on the arches and analyzed by means of SEM and Spectrophotometry. Surface roughness and Spectrophotometry data were submitted to one-way ANOVA, followed by Tukey's test (α=0.05) and SEM/EDS data obtained by exploratory analysis. The NbTi arches showed higher surface roughness when compared to the other groups, followed by the NiTi and TiMb arches and the steel arches group (p<0.05). It was observed a lower adherence of S. mutans biofilm in steel arches when compared to the other groups. The absorbance results showed higher biofilm formation for the NbTi group, followed by Steel, NiTi and TiMb. (p<0.05). The results of EDS confirm the compositions proposed by the manufacturer. It was concluded that the alloy type in orthodontic arches has an effect on surface roughness. The chemical and morphological characteristics of the arches are related to the adhesion of S. mutans biofilm.


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Como Citar

Braga, M. L. L. M., Ferraz-Facury, A. G. B., Franco, E. M., Marcelino, L., Menezes, L. dos S., Costa, A. R., & Neves, J. G. (2023). Chemical, Morphological and Bacterial Adhesion Analysis of Orthodontic Wires Composed of Different Metallic Alloys. ARCHIVES OF HEALTH INVESTIGATION, 12(9), 1962–1968.



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