title: The effect of moisture and blood contamination on bond strength of a new orthodontic bonding material.
abstract: The practice of orthodontics often requires the bonding of brackets under difficult conditions of moisture and/or blood contamination. Transbond MIP (3M Unitek, Monrovia, Calif) is a hydrophilic primer designed to bond in moist conditions. This study evaluated the bond strength of Transbond MIP under dry, moist, and blood-contaminated conditions. Ninety human premolars were bonded in 3 equal groups with Transbond MIP after acid etching; the enamel surfaces were either dry, moist, or contaminated with human blood. The shear bond strength was recorded. Dry bonding resulted in a significantly higher bond strength (15.69 MPa) than moist (12.89 MPa) or blood-contaminated (11.16 MPa) bonds. However, all bond strengths were in excess of previous reports of required clinical bond strength, and it was concluded that Transbond MIP is a suitable adhesive for bonding in conditions of poor moisture control or blood contamination.
authors.affiliation: Dental School, Newcastle University, Newcatle upon Tyne, UK.
authors.forename: R S
authors.initials: RS
authors.lastname: Hobson
authors.forename: J
authors.initials: J
authors.lastname: Ledvinka
authors.forename: J G
authors.initials: JG
authors.lastname: Meechan
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry*; D000293:Adolescent; D000704:Analysis of Variance; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D001769:Blood; D002648:Child; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D019279:Resin Cements; D014867:Water; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate