title: The effect of etch time and debond interval upon the shear bond strength of metallic orthodontic brackets.
abstract: Groups of orthodontic brackets were attached to enamel after etching for 15, 30 or 60 seconds. They were debonded by shear forces after 5 or 15 minutes, or 24 hours. The 15 seconds etch/5 minutes debond time specimens had much lower shear strengths than other groups. Sixty-second specimens showed evidence of tooth surface damage after debonding. Fifteen seconds of etching is therefore recommended routinely for bonding brackets. If a bracket is to be ligated within 5 minutes of placement, 30 seconds etching is recommended. A 60-second etch is considered too severe and should not be used.
authors.affiliation: School of Dentistry, University of Birmingham, U.K.
authors.forename: M
authors.initials: M
authors.lastname: Bin Abdullah
authors.forename: W P
authors.initials: WP
authors.lastname: Rock
mesh_terms: D000134:Acid Etching, Dental; D000269:Adhesives / Q000737:chemistry; D000293:Adolescent; D000388:Air; D002648:Child; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D017005:Dental Debonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure; D006801:Humans; D008670:Metals / Q000737:chemistry*; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000008:administration & dosage; D019279:Resin Cements; D013314:Stress, Mechanical; D013997:Time Factors; D014867:Water
chemical_list: D000269:Adhesives; D003188:Composite Resins; D008670:Metals; D010756:Phosphoric Acids; D019279:Resin Cements; D014867:Water; C071164:Right-On cement