title: An in vivo investigation into bond failure rates with a new self-etching primer system.
abstract: Self-etching primers have recently been introduced to simplify the orthodontic bonding process. The aim of this study was to compare the effectiveness of such a product with conventional 2-stage etching and priming with 37% o-phosphoric acid and a conventional unfilled primer. Twenty consecutive patients having orthodontic bonds placed were selected to participate in this cross-mouth control study. Diagonally opposite quadrants were randomly allocated to either the self-etching primer group or the conventional etching and priming group. A total of 364 teeth were bonded with a light-cured diacrylate adhesive; bond failures were then monitored over 6 months. There were 20 bond failures (10.99%) in the self-etching primer group and 9 bond failures (4.95%) in the conventional etch and priming group over this period. The results were analyzed with the McNemar test and 95% confidence interval. The difference between the failure proportions was -0.06 with an associated 95% confidence interval of -0.121 to 0.001. This study produced weak evidence to suggest that bond failures with a self-etching primer will be higher than those with conventional etching and priming. This increased likelihood of bond failure must be weighed against the time advantage of the self-etching primer when used at the initial bonding appointment.
authors.affiliation: Orthodontic Department, Royal United Hospital, Combe Park, Bath, UK. tony-ireland@lineone.net
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Ireland
authors.forename: Helen
authors.initials: H
authors.lastname: Knight
authors.forename: Martyn
authors.initials: M
authors.lastname: Sherriff
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D001840:Dental Bonding; D006801:Humans; D008422:Materials Testing; D016910:Orthodontic Brackets; D010756:Phosphoric Acids; D019279:Resin Cements
chemical_list: D010756:Phosphoric Acids; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C030242:phosphoric acid