title: Bond strength following the application of chlorhexidine on etched enamel.
abstract: The purpose of this study was to determine whether the application of chlorhexidine to etched enamel affects the shear bond strength and bracket/adhesive failure modes of orthodontic brackets. Forty recently extracted third molars were cleaned divided into two groups of twenty. The first group was etched with a 37% phosphoric acid gel, and a sealant was applied containing a chlorhexidine varnish. Stainless steel orthodontic brackets were bonded using the Transbond XT bonding system (3M/Unitek). Teeth in the second group were etched and bonded using the same bonding system but without chlorhexidine. A Zwick Universal Testing Machine was used to determine shear bond strengths. There were no significant differences in bond strengths between the chlorhexidine treated teeth (= 11.8 +/- 2.1 MPa) and the controls (= 12.4 +/- 3.1 MPa) (p = 0.129). The Chi Square test evaluating the residual adhesive on the enamel surfaces showed no significant differences (P = 0.136) between the two groups evaluated. The use of a primer containing chlorhexidine does not significantly affect shear bond strength nor the fracture site (bond failure location).
authors.affiliation: University of Iowa, College of Dentistry, Iowa City 52242-1001, USA.
authors.forename: P L
authors.initials: PL
authors.lastname: Damon
authors.forename: S E
authors.initials: SE
authors.lastname: Bishara
authors.forename: M E
authors.initials: ME
authors.lastname: Olsen
authors.forename: J R
authors.initials: JR
authors.lastname: Jakobsen
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D000269:Adhesives / Q000737:chemistry; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002710:Chlorhexidine / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003799:Dental Stress Analysis / Q000295:instrumentation; D004868:Equipment Failure; D006801:Humans; D008422:Materials Testing; D008963:Molar; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000008:administration & dosage; D010895:Pit and Fissure Sealants / Q000737:chemistry; D013193:Stainless Steel; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D000269:Adhesives; D010756:Phosphoric Acids; D010895:Pit and Fissure Sealants; D013193:Stainless Steel; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate; D002710:Chlorhexidine