Effect of silver nanoparticles on the physicochemical and antimicrobial properties of an orthodontic adhesive

• Published in: Journal of applied oral science Vol. 24; no. 4; pp. 404 - 410
• Main Authors: Degrazia, Felipe Weidenbach, Leitune, Vicente Castelo Branco, Garcia, Isadora Martini, Arthur, Rodrigo Alex, Samuel, Susana Maria Werner, Collares, Fabrício Mezzomo
• Format: Journal Article
• Language: English; Portuguese
• Published: Brazil Faculdade De Odontologia De Bauru - USP 01.07.2016; University of São Paulo
• Subjects: Animals; Anti-bacterial agents; Anti-Bacterial Agents - chemistry; Cattle; Colony Count, Microbial; Composite Resins - chemistry; Dental Bonding - methods; Dental cements; Dental Cements - chemistry; Dental Enamel - drug effects; Dental Enamel - microbiology; DENTISTRY, ORAL SURGERY & MEDICINE; Light-Curing of Dental Adhesives; Materials Testing; Metal nanoparticles; Metal Nanoparticles - chemistry; Original; Orthodontic Brackets - microbiology; Particle Size; Reproducibility of Results; Shear Strength; Silver - chemistry; Spectrum Analysis, Raman; Streptococcus mutans - drug effects; Streptococcus mutans - growth & development; Surface Properties; Metal nanoparticles; Shear strength; Anti-bacterial agents; Dental cements
• ISSN: 1678-7757; 1678-7765; 1678-7765; 1678-7757
• DOI: 10.1590/1678-775720160154

This study aimed to incorporate silver nanoparticle solutions (AgNP) in an orthodontic adhesive and evaluate its physicochemical and antimicrobial properties. Silver nanoparticle solutions were added to a commercial adhesive in different concentrations (w/w): 0%, 0.11%, 0.18%, and 0.33%. Shear bond strength (SBS) test was performed after bonding metal brackets to enamel. Raman spectroscopy was used to analyze in situ the degree of conversion (DC) of the adhesive layer. The surface free energy (SFE) was evaluated after the measurement of contact angles. Growth inhibition of Streptococcus mutans in liquid and solid media was determined by colony-forming unit count and inhibition halo, respectively. One-way ANOVA was performed for SBS, DC, SFE, and growth inhibition. The incorporation of AgNP solution decreased the SBS (p<0.001) and DC in situ (p<0.001) values. SFE decreased after addition of 0.18% and 0.33% AgNP. Growth inhibition of S. mutans in liquid media was obtained after silver addition (p<0.05). The addition of AgNP solutions to Transbond™ XT adhesive primer inhibited S. mutans growth. SBS, DC, and SFE values decreased after incorporation up to 0.33% AgNP solution without compromising the chemical and physical properties of the adhesive.