title: Ultrasonic cleaning of silica-coated zirconia influences bond strength between zirconia and resin luting material.
abstract: The purpose of this study was to evaluate how ultrasonic cleaning of silica-coated zirconia surfaces would influence the latter's bond strength to resin luting material. Forty zirconia specimens were divided into four groups: one air abrasion group and three silica-coated groups. Silica-coated specimens were cleaned with distilled water using an ultrasonic cleaner after tribochemical silica coating and then divided into three groups according to cleaning durations: 1 minute, 5 minutes, or without cleaning. Following which, resin luting material was polymerized against the specimens. After storage in water for 24 hours, the specimens were subjected to shear bond strength test. Shear bond strength of silica-coated group without cleaning was significantly higher than the other three groups, but there were no statistically significant differences among the three latter groups. SEM images suggested visible differences among the treatment methods. With EDXS analysis, it was revealed that ultrasonic cleaning decreased the silica content on the treated surfaces. Therefore, results showed that ultrasonic cleaning of tribochemically silica-coated zirconia surfaces decreased the adhesion efficacy to resin luting material.
authors.affiliation: Occlusion and Removable Prosthodontics, Okayama University Hospital of Dentistry, 2-5-1 Shikata-cho, Okayama 700-8525, Japan. goro@md.okayama-u.ac.jp
authors.forename: Goro
authors.initials: G
authors.lastname: Nishigawa
authors.forename: Yukinori
authors.initials: Y
authors.lastname: Maruo
authors.forename: Masao
authors.initials: M
authors.lastname: Irie
authors.forename: Morihiko
authors.initials: M
authors.lastname: Oka
authors.forename: Kumiko
authors.initials: K
authors.lastname: Yoshihara
authors.forename: Shogo
authors.initials: S
authors.lastname: Minagi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Nagaoka
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D020906:Air Abrasion, Dental; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012822:Silicon Dioxide / Q000737:chemistry*; D013314:Stress, Mechanical; D013997:Time Factors; D014465:Ultrasonics; D014867:Water / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; C438843:Panavia-Fluoro; D019279:Resin Cements; C499362:yttria stabilized tetragonal zirconia; D014867:Water; D003776:Dental Porcelain; D015019:Yttrium; D012822:Silicon Dioxide; D015040:Zirconium; C028541:zirconium oxide