title: Characteristics and porcelain bond strength of (Ti,Al)N coating on dental alloys.
abstract: The effect of a novel titanium-aluminum nitride film, or (Ti,Al)N film, on the bond strength between a dental porcelain and two nickel-based dental alloy substrates was investigated. A thin layer of (Ti,Al)N film was deposited on flat metal samples using a reactive radio-frequency sputtering method. A uniform thickness of porcelain was applied to the film- coated metal samples. Metal-ceramic specimens were subjected to three-point bending, and failure loads were recorded. Bond strengths between the porcelain and (Ti,Al)N-coated metal alloys ranged from 159.0 +/- 11.7 N to 278.0 +/- 12.3 N. These values were significantly greater (p< 0.05) than bond strengths recorded for control samples that did not incorporate the (Ti,Al)N film. An electron probe microanalyzer with a line profile mode was used to characterize the interface between the (Ti,Al)N film and the porcelain. Results of this investigation suggest that the (Ti,Al)N film (1) increases the flexural bond strength between dental porcelain and nickel-based alloy substrates by permitting elemental diffusion, (2) interferes with the surface oxide formation that characteristically originates from the nickel-based metal alloy substrate, and (3) provides an appropriate oxide layer for porcelain application.
authors.affiliation: Institute of Oral Biology, School of Dentistry, National Yang-Ming University, Taipei 112, Taiwan. chungk@uthscsa.edu
authors.forename: Kwok-Hung
authors.initials: KH
authors.lastname: Chung
authors.forename: Jeng-Gong
authors.initials: JG
authors.lastname: Duh
authors.forename: Daehwan
authors.initials: D
authors.lastname: Shin
authors.forename: David R
authors.initials: DR
authors.lastname: Cagna
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Cronin
mesh_terms: D000497:Alloys / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry*; D020099:Coated Materials, Biocompatible; D003722:Dental Alloys; D003735:Dental Casting Technique; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D003722:Dental Alloys; D003776:Dental Porcelain; C041500:titanium nitride; D000535:Aluminum; D014025:Titanium