title: Evaluating Various Preparation Protocols on the Shear Bond Strength of Repaired Composite.
abstract: BACKGROUND
  The aim of this study is to evaluate the effect of different combinations of various surface treatments on the shear bond strength (SBS) of repaired composite resin.
  
  
  METHODS
  A total of 122 composite samples were prepared from Filtek Z350 XT. Samples were light cured and stored for 6 weeks. Surface treatment of old composite was done in five groups: Group I: bur roughening + phosphoric acid etching, group II: bur roughening + hydrofluoric acid etching + silane coupling agent, group II: air abrasion + phosphoric acid etching, group IV: air abrasion + phosphoric acid etching + silane coupling agent, group V: air abrasion + hydrofluoric acid etching + silane coupling agent. Bonding agent was applied to all surface-treated old composites and light cured. The fresh composite resin was bonded to treated surfaces and cured and stored in water at 37°C for 6 weeks. Shear bond strength was measured by a universal testing machine.
  
  
  RESULTS
  Shear bond strength values of all groups were not statistically significant except for group V, which showed statistically significant higher SBS than group III.
  
  
  CONCLUSIONS
  Techniques with readily available materials at the clinic can attain similar SBS to more elaborate technique involving potentially hazardous materials.
authors.affiliation: Department of Conservative Dentistry, University of Jordan Amman, Jordan, e-mail: dr.ayahalasmar@yahoo.com.
authors.forename: Ayah A
authors.initials: AA
authors.lastname: Al-Asmar
authors.affiliation: Department of Mechanical Engineering, Jordan University of Science and Technology, Irbid, Jordan.
authors.forename: Khaled S
authors.initials: KS
authors.lastname: Hatamleh
authors.affiliation: Department of Cranio-Maxillofacial Prosthetics Unit, King's College Hospital NHS Foundation Trust, London, UK.
authors.forename: Muhanad
authors.initials: M
authors.lastname: Hatamleh
authors.affiliation: Department of Conservative Dentistry, University of Jordan Amman, Jordan.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Al-Rabab'ah
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D020906:Air Abrasion, Dental / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003799:Dental Stress Analysis; D033081:Shear Strength
chemical_list: D003188:Composite Resins; C533204:filtek Z350
keywords: Bond; Composite; Etching; Repair Silane.