title: Notching of orthodontic bonding resin to facilitate ceramic bracket debond--an ex vivo investigation.
abstract: This ex vivo study assessed the potential of introducing a notch in the bond layer, as a means of facilitating the removal of ceramic brackets. Sixty extracted premolar teeth were divided into three groups of 20 teeth and bonded with Intrigue brackets using Concise chemically-cured adhesive. The bonding technique was modified with groups 1 and 2 by introducing a notch in the bond layer. Group 1 was notched from the gingival aspect, group 2 from the occlusal, and group 3 served as a control. The brackets were removed by applying a shear load from the gingival aspect using an Instron universal testing machine. The mean force to debond was calculated for each group. The results showed that introducing a notch significantly reduced the mean and maximal debond forces. This was confirmed with Weibull analysis with the notched specimens having a higher probability of failure at any force. In addition, ceramic bracket fracture was eliminated. Notching the bonding resin may be helpful in facilitating the removal of ceramic brackets.
authors.affiliation: Department of Child Dental Health, Newcastle Dental School, Newcastle upon Tyne, UK.
authors.forename: C J
authors.initials: CJ
authors.lastname: Larmour
authors.forename: J F
authors.initials: JF
authors.lastname: McCabe
authors.forename: P H
authors.initials: PH
authors.lastname: Gordon
mesh_terms: D002516:Ceramics; D001840:Dental Bonding / Q000379:methods*; D017005:Dental Debonding; D003799:Dental Stress Analysis; D006801:Humans; D016910:Orthodontic Brackets; D016019:Survival Analysis