title: Long-term Bond Strength between Layering Indirect Composite Material and Zirconia Coated with Silicabased Ceramics.
abstract: OBJECTIVE
  This study evaluated the long-term shear bond strength between an indirect composite material and a zirconia framework coated with silica-based ceramics, taking the effect of different primers into account.
  
  
  METHODS
  A total of 165 airborne-particle abraded zirconia disks were subjected to one of three pretreatments: no pretreatment (ZR-AB), airborne-particle abrasion of zirconia coated with feldspathic porcelain (ZR-PO-AB), and 9.5% hydrofluoric acid etching of zirconia coated with feldspathic porcelain (ZR-PO-HF). An indirect composite material (Estenia C&B) was then bonded to the zirconia disks after they were treated with one of the following primers: Clearfil Photo Bond (CPB), Clearfil Photo Bond with Clearfil Porcelain Bond Activator (CPB + Activator), Estenia Opaque Primer (EOP), Porcelain Liner M Liquid B (PLB), or no priming (CON, control group). Shear bond strength was tested after 100,000 thermocycles, and the data were analyzed using the Steel-Dwass U-test (α = 0.05).
  
  
  RESULTS
  For ZR-PO-AB and ZR-PO-HF specimens, bond strength was highest in the CPB+Activator group (25.8 MPa and 22.4 MPa, respectively). Bond strengths were significantly lower for ZR-AB specimens in the CON and PLB groups and for ZR-PO-AB specimens in the CON, CPB, and EOP groups.
  
  
  CONCLUSIONS
  Combined application of a hydrophobic phosphate monomer (MDP) and silane coupling agent enhanced the long-term bond strength of indirect composite material to a zirconia coated with silica-based ceramics.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Fushiki
authors.forename: Futoshi
authors.initials: F
authors.lastname: Komine
authors.forename: Junichi
authors.initials: J
authors.lastname: Honda
authors.forename: Shingo
authors.initials: S
authors.lastname: Kamio
authors.forename: Markus B
authors.initials: MB
authors.lastname: Blatz
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000538:Aluminum Silicates / Q000737:chemistry; D002516:Ceramics / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013314:Stress, Mechanical; D013696:Temperature; D013871:Thiones / Q000737:chemistry; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; C076805:Clearfil Porcelain Bond; D020099:Coated Materials, Biocompatible; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C521708:Estenia Opaque Primer; D008689:Methacrylates; D011140:Polyurethanes; D017680:Potassium Compounds; D019279:Resin Cements; D012821:Silanes; D013871:Thiones; C091839:urethanetrimethacrylate; D003776:Dental Porcelain; C016447:feldspar; C074669:Clearfil Photo Bond; D012822:Silicon Dioxide; D015040:Zirconium; D006858:Hydrofluoric Acid; C028541:zirconium oxide