title: Clinical evaluation of the failure rate of metallic brackets bonded with orthodontic composites.
abstract: The purpose of the present study was to evaluate in vivo the failure rate of metallic brackets bonded with two orthodontic composites. Nineteen patients with ages ranging from 10.5 to 38.7 years needing corrective orthodontic treatment were selected for study. The enamel surfaces from second premolars to second premolars were treated with Transbond Plus-Self Etching Primer (3M Unitek). Next, 380 orthodontic brackets were bonded on maxillary and mandibular teeth, as follows: 190 with Transbond XT composite (3M Unitek) (control) and 190 with Transbond Plus Color Change (3M Unitek) (experimental) in contralateral quadrants. The bonded brackets were light cured for 40 s, and initial alignment archwires were inserted. Bond failure rates were recorded over a six-month period. At the end of the evaluation, six bond failures occurred, three for each composite. Kaplan-Meyer method and log-rank test (Mantel-Cox) was used for statistical analysis, and no statistically significant difference was found between the materials (p=0.999). Both Transbond XT and Transbond Plus Color Change composites had low debonding rates over the study period.
authors.affiliation: University of São Paulo, Ribeirão Preto, SP, Brazil. fabioromano@forp.usp.br
authors.forename: Fábio Lourenço
authors.initials: FL
authors.lastname: Romano
authors.forename: Rodrigo Alexandre
authors.initials: RA
authors.lastname: Valério
authors.forename: Jaciara Miranda
authors.initials: JM
authors.lastname: Gomes-Silva
authors.forename: José Tarcísio Lima
authors.initials: JT
authors.lastname: Ferreira
authors.forename: Gisele
authors.initials: G
authors.lastname: Faria
authors.forename: Maria Cristina
authors.initials: MC
authors.lastname: Borsatto
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000648:ultrastructure; D002648:Child; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification; D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation; D008297:Male; D008334:Mandible; D008437:Maxilla; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D019279:Resin Cements / Q000737:chemistry*; D013997:Time Factors; D055815:Young Adult
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT