title: Promotion of resin bonding to dental zirconia ceramic using plasma deposition of tetramethylsilane and benzene.
abstract: The aim of this study was to investigate the effects of plasma-enhanced deposition of an organosilane and benzene on resin bonding to a dental zirconia ceramic. A total of 70 zirconia specimens, which were polished before sintering, were randomly divided into five groups according to surface treatments before applying a dental adhesive (each group, n = 14): group 1, no previous treatment (control); group 2, plasma deposition with tetramethylsilane (TMS); group 3, plasma deposition with benzene; group 4, sequential plasma deposition with TMS and benzene; and group 5, a zirconia primer (Z-Prime Plus). A dental adhesive (Scotchbond Multi-Purpose adhesive) was applied to the surface-treated zirconia, and resin composite rods were built in to enable shear bond-strength testing. The sequential deposition of TMS and benzene showed the highest bond strength [22.7 ± 3.7 MPa (mean ± SD)], approximately twice that of Z-Prime Plus (10.3 ± 3.2 MPa). The plasma deposition with either TMS or benzene also significantly improved bond-strength values compared with the negative-control group, and their effects were not statistically different from that of Z-Prime Plus. Following plasma deposition with TMS, the introduction of silicon-oxygen-zirconium (Si-O-Zr) bonds on the zirconia surface was confirmed via X-ray photoelectron spectroscopy (XPS) analysis. Transmission electron microscopy and energy dispersive X-ray spectroscopy showed that a silica-like layer and a polymerizable carbon-rich layer were formed through sequential deposition with TMS and benzene.
authors.affiliation: Department of Dental Biomaterials Science, Seoul National University School of Dentistry & Dental Research Institute, Seoul, Korea.
authors.forename: Geum-Jun
authors.initials: GJ
authors.lastname: Han
authors.affiliation: Department of Conservative Dentistry, Institute of Oral Health Science, Ajou University School of Medicine, Suwon, Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Conservative Dentistry, Seoul National University School of Dentistry & Dental Research Institute, Seoul, Korea.
authors.forename: Byeong-Hoon
authors.initials: BH
authors.lastname: Cho
authors.affiliation: Department of Materials Science & Engineering, Seoul National University, Seoul, Korea.
authors.forename: Kyu-Hwan
authors.initials: KH
authors.lastname: Oh
authors.affiliation: Department of Materials Science & Engineering, Seoul National University, Seoul, Korea.
authors.forename: Je-Jun
authors.initials: JJ
authors.lastname: Jeong
mesh_terms: D001554:Benzene / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D056951:Photoelectron Spectroscopy; D058626:Plasma Gases; D011897:Random Allocation; D013052:Spectrometry, X-Ray Emission; D013499:Surface Properties; D014297:Trimethylsilyl Compounds / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003188:Composite Resins; D058626:Plasma Gases; D014297:Trimethylsilyl Compounds; C073196:tetramethylsilane; D015040:Zirconium; D001554:Benzene; C028541:zirconium oxide
keywords: adhesion; non-thermal plasma; polymer deposition; siloxane bond