Effects of different chlorhexidine pretreatments on adhesion of metal brackets in vitro

Abstract

ObjectiveTo investigate the effect of chlorhexidine applications in various forms and concentrations on adhesion and failure modes of metal brackets in vitro.Material and methodsNinety bovine enamel specimens were allocated to six groups (n=15). Metal brackets were bonded on all specimens after chlorhexidine pre-treatments forming the following groups: (1) untreated specimens (control); (2) 40% varnish (EC40, Biodent BV, Netherlands), remnants removed with brushing mimicking patient cleaning; (3) 40% varnish (EC40), remnants removed with brushing mimicking professional cleaning; (4) 1% varnish (Cervitec Plus, Ivoclar vivadent, Schaan, Liechtenstein), remnants not removed; (5) brushed with% 1 gel (Corsodyl, GlaxoSmithKline, Münchenbuchsee, Germany), remnants not removed; (6) immersed in 0.07% mouthrinse (Corsodyl, GlaxoSmithKline, Münchenbuchsee, Germany), remnant not rinsed. Debonding of brackets was performed using a universal testing machine. Data were analysed using one-way ANOVA and post-hoc Scheffé test.ResultsGroup 4 performed significantly inferior than all the other groups and the control. Group 4 presented the highest number of adhesive failures at the enamel-resin interface whereas in other groups no failures at adhesive-resin interface was observed.ConclusionPresence of chlorhexidine varnish prior to bracket bonding adversely affects adhesion. Concentration of chlorhexidine pre-treatment has no influence on shear bond strength.

An evaluation of the antibacterial properties and shear bond strength of copper nanoparticles as a nanofiller in orthodontic adhesive

“…However, past evidence has demonstrated that the addition of antibacterial components such as chlorhexidine, varnish Liliana Argueta-Figueroa: l_argueta_figueroa@hotmail.com; Rogelio J. Scougall-Vilchis: rogelio_scougall@hotmail.com; Raúl A. Morales-Luckie: ramluckie@hotmail.com; Oscar F. Olea-Mejía: oleaoscar@yahoo.com and gel significantly decreased shear bond strength of the bonding material. 4,5 Currently, a major application of nanotechnology is an antibacterial effect produced by metal nanoparticles (NPs) of either gold, 6 silver, 7 zinc 8 or copper. 9 Copper is significantly more affordable than silver or gold and so it is economically attractive.…”

Antibacterial Activity and Bonding Ability of an Orthodontic Adhesive Containing the Antibacterial Monomer 2-Methacryloxylethyl Hexadecyl Methyl Ammonium Bromide

“…Several investigations have been performed to endow adhesives with antibacterial properties. Owing to their effective antibacterial properties, chlorhexidine and fluorine-containing agents have been previously mixed with adhesives; however, the release of the active component limits the duration of their effect and may influence the mechanical characteristics of the adhesive 21 22 . Furthermore, other Ag-loaded antibacterial materials have been shown to be limited due to discoloration and reduced esthetics 23 24 .…”

The dual anti‐caries effect of carboxymethyl chitosan nanogel loaded with chimeric lysin ClyR and amorphous calcium phosphate

“…The recommended use of CHX mouthwash is twice daily (morning and evening) oral rinsing for 30 s after toothbrushing [55]. Previous studies have shown that use of CHX mouthwash can result in better oral hygiene and lower the incidence of white spot lesions during orthodontic treatment [57]. According to the anti-biofilm assay, CMC-ClyR-ACP nanogel treatment was not as effective as the CHX treatment; however, this result was contradicted by the surface hardness data, which showed that CMC-ClyR-ACP treatment and CHX treatment resulted in similar %SHL values, a result that was confirmed with the SEM micrographs.…”