title: Bonding durability of dual-curing composite core material with different self-etching adhesive systems in a model complete vertical root fracture reconstruction.
abstract: OBJECTIVE
  This study evaluated a dual-curing composite along with different dentin adhesive systems for 1 year under water storage, as a new bonding method of root fragments in complete vertical root fracture.
  
  
  METHODS
  Bovine root fragments were bonded with the dual-curing resin composite Clearfil DC Core Automix (DCA) and one of three adhesive systems: two-step self-etching adhesive Clearfil SE Bond (SE), one-step self-etching adhesive Tokuyama Bond Force (BF), one-step dual-curing self-etching adhesive Clearfil DC Bond (DC). Microtensile bond strength (µTBS)/ultimate tensile bond strength (UTS), FE-SEM ultramorphology of fracture modes, and adhesive dentin interface were observed after water storage for periods of up to one year. The data were analyzed with two-way ANOVA.
  
  
  RESULTS
  µTBS was influenced by "dentin adhesive system" (F = 324.455, p < 0.001) and "length of water storage" (F = 8.470, p < 0.001). SE yielded significantly higher µTBS, regardless of storage period (p < 0.05) and maintained the initial µTBS without a significant change after 1 year of water storage (p > 0.05). From 24 h to 1 month, BF showed significantly higher bond strength than DC. UTS of DCA was influenced only by the curing mode of the material (F = 5.051, p = 0.027), but not by the length of water storage (F = 0.053, p > 0.05).
  
  
  CONCLUSIONS
  Two-step self-etching adhesive systems and dual-curing composite core material can be considered as a suitable bonding method for complete root fractures.
authors: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. kanchanapgkw@yahoo.com
authors: Kanchana
authors: K
authors: Waidyasekera
authors: Toru
authors: T
authors: Nikaido
authors: Dinesh
authors: D
authors: Weerasinghe
authors: Hamid
authors: H
authors: Nurrohman
authors: Junji
authors: J
authors: Tagami
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D008422:Materials Testing; D055116:Self-Curing of Dental Resins; D013718:Tensile Strength; D014082:Tooth Fractures / Q000628:therapy*; D014092:Tooth Root / Q000293:injuries*; D014867:Water
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D014867:Water