title: Bonding brackets to porcelain--in vitro study.
abstract: The aim of this research was to verify, in vitro, the effect of various porcelain surface treatment on the shear strength of orthodontic brackets bonded to porcelain and the mode of fracture after debonding. Eighty-eight samples of metallic supported feldspathic porcelain were randomly divided into four groups according to their surface preparation as follows: the porcelain was maintained intact (GI), roughened with a diamond bur (GII), etched with 10% hydrofluoric acid (GIII), or sandblasted with aluminum oxide (GIV). The specimens were treated with silane (Scotchprime) and brackets were bonded with Concise. Each sample was subjected to a shear load at a crosshead speed of 1 mm/min and a recording was made at the point of failure. Bond strengths, adequate to withstand the application of orthodontic forces, were achieved in all groups. The Kruskal-Wallis statistical test showed no significant differences in bond strength between the groups (p > 0.05). However, many more porcelain fractures occurred on deglazed porcelain. This study indicates that with the appropriate material selection, the silane/composite procedure alone may be adequate for bonding.
authors.affiliation: Department of Pedodontics and Orthodontics, Division of Orthodontics, Faculty of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil. eduardozt@aol.com
authors.forename: Eduardo Franzotti
authors.initials: EF
authors.lastname: Sant'Anna
authors.forename: Maria Evangelina
authors.initials: ME
authors.lastname: Monnerat
authors.forename: Orlando
authors.initials: O
authors.lastname: Chevitarese
authors.forename: Maria Bernadete Sasso
authors.initials: MB
authors.lastname: Stuani
mesh_terms: D000134:Acid Etching, Dental; D000537:Aluminum Oxide; D017438:Bisphenol A-Glycidyl Methacrylate; D001840:Dental Bonding; D017005:Dental Debonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D018130:Diamond; D008422:Materials Testing; D016910:Orthodontic Brackets; D011897:Random Allocation; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D017640:Silicates; D013499:Surface Properties
chemical_list: D019279:Resin Cements; D012821:Silanes; D017640:Silicates; D003776:Dental Porcelain; D017438:Bisphenol A-Glycidyl Methacrylate; D018130:Diamond; D000537:Aluminum Oxide; C005144:pumice