title: Shear bond strength of veneering composite resin to titanium nitride coating alloy deposited by radiofrequency sputtering.
abstract: OBJECTIVE
  The success of dental restorations utilizing composite resin over cast alloy has been variable and affected by micro-leakage. The purpose of this study was to investigate the shear bond strength between a composite resin and cast dental alloy coated with a layer of titanium nitride (TiN).
  
  
  METHODS
  Cast disk specimens made of Au-Pd-Ag alloy were randomly divided into four groups. The first group was left uncoated as a control while one group was coated with a metal conditioner, and the other two were coated with TiN at either 200 or 500 W with a radiofrequency magnetron sputtering system. Each group was then bonded to one of two types of light-activated composite resin material. Shear bond strengths were tested and compared for each specimen. The bond strength of each group was analyzed by 2-way ANOVA and by post hoc multiple comparison tests (Fisher's PLSD).
  
  
  RESULTS
  As the interaction among groups was not significant (p=0.27) by 2-way ANOVA, TiN coated groups were found to have improved shear bond strength compared with non-coated groups without metal conditioner for both resin composite materials by multiple comparison tests. Furthermore, TiN coating is significantly stronger than non-coated groups with metal conditioner for one of the two resin composite materials examined (p<0.01).
  
  
  CONCLUSIONS
  The results suggested that metal surface modification by coated TiN represents a technique that may significantly improve the bond between the Au-Pd-Ag alloy and veneering resin composite.
authors.affiliation: Department of Oral & Maxillofacial Rehabilitation, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan.
authors.forename: Kinya
authors.initials: K
authors.lastname: Tanaka
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Kimoto
authors.forename: Tomoji
authors.initials: T
authors.lastname: Sawada
authors.forename: Minoru
authors.initials: M
authors.lastname: Toyoda
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003801:Dental Veneers; D011140:Polyurethanes / Q000737:chemistry*; D033081:Shear Strength; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; C041500:titanium nitride; D014025:Titanium