title: Effect of surface treatment on bond strength between an indirect composite material and a zirconia framework.
abstract: The present study evaluated the effect of various surface treatments for zirconia ceramics on shear bond strength between an indirect composite material and zirconia ceramics. In addition, we investigated the durability of shear bond strength by using artificial aging (20,000 thermocycles). A total of 176 Katana zirconia disks were randomly divided into eight groups according to surface treatment, as follows: group CON (as-milled); group GRD (wet-ground with 600-grit silicon carbide abrasive paper); groups 0.05, 0.1, 0.2, 0.4, and 0.6 MPa (airborne-particle abrasion at 0.05, 0.1, 0.2, 0.4, and 0.6 MPa, respectively); and group HF (9.5% hydrofluoric acid etching). Shear bond strength was measured at 0 thermocycles in half the specimens after 24-h immersion. The remaining specimens were subjected to 20,000 thermocycles before shear bond strength testing. Among the eight groups, the 0.1, 0.2, 0.4, and 0.6 MPa airborne-particle abraded groups had significantly higher bond strengths before and after thermocycling. The Mann-Whitney U-test revealed no significant difference in shear bond strength between 0 and 20,000 thermocycles, except in the 0.2 MPa group (P = 0.013). From the results of this study, use of airborne-particle abrasion at a pressure of 0.1 MPa or higher increases initial and durable bond strength between an indirect composite material and zirconia ceramics.
authors.affiliation: Department of Fixed Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan. komine@dent.nihon-u.ac.jp
authors.forename: Futoshi
authors.initials: F
authors.lastname: Komine
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Fushiki
authors.forename: Mai
authors.initials: M
authors.lastname: Koizuka
authors.forename: Kohei
authors.initials: K
authors.lastname: Taguchi
authors.forename: Shingo
authors.initials: S
authors.lastname: Kamio
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D000134:Acid Etching, Dental; D020906:Air Abrasion, Dental; D003188:Composite Resins; D001840:Dental Bonding; D003775:Dental Polishing; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D006358:Hot Temperature; D008689:Methacrylates; D011140:Polyurethanes; D011897:Random Allocation; D019279:Resin Cements; D033081:Shear Strength; D013499:Surface Properties; D013997:Time Factors; D015040:Zirconium
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D011140:Polyurethanes; D019279:Resin Cements; C091839:urethanetrimethacrylate; D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide