title: Shear bond strength, bond failure, and scanning electron microscopy analysis of a new flowable composite for orthodontic use.
abstract: A new dental flowable composite, Denfil Flow, was evaluated for the bonding of orthodontic brackets by determining its shear bond strength (SBS) and the mode of bond failure after debonding. Eighty extracted human premolars were divided into two equal groups. Metal brackets were bonded to etched enamel using a composite resin control (Transbond XT) or Denfil Flow. After 72 hours of incubation in saline solution at 37 degrees C, debonding was performed with a shearing force. The SBS and the mode of bond failure were examined. In addition, representative samples from each group were examined by scanning electron microscopy (SEM). No significant difference was observed in the SBS between the groups, and a clinically acceptable SBS was found for the two adhesives. Bond failures occurred mostly in the bracket-adhesive interface, without significant differences between the groups. At SEM analysis, Denfil Flow showed a greater frequency of air bubbles within the resin than did Transbond XT. In conclusion, Denfil Flow displayed the same SBS as traditional composite resins and similar bond failures. Further clinical studies are required.
authors.affiliation: Department of Orthodontics, University G.D'Annunzio, Chieti, Via Le Mainarde 26, Pescara 65121, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: D'Attilio
authors.forename: Tonino
authors.initials: T
authors.lastname: Traini
authors.forename: Donato
authors.initials: D
authors.lastname: Di Iorio
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Varvara
authors.forename: Felice
authors.initials: F
authors.lastname: Festa
authors.forename: Simona
authors.initials: S
authors.lastname: Tecco
mesh_terms: D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D001641:Bicuspid; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D017005:Dental Debonding; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D019544:Equipment Failure Analysis; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D016037:Single-Blind Method
chemical_list: D000269:Adhesives; D003188:Composite Resins; C503708:Denfil Flow; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C477790:Transbond XT; C111840:flowable hybrid composite