title: Thickness and surface structure of a ceramic layer created on three indirect resin composites with aerosol deposition.
abstract: OBJECTIVE
  Aerosol deposition is a technology for coating ceramics with impact consolidation at room temperature. The aim of the present study was to investigate the thickness and the microstructure of the aluminium oxide layer on different three dental resin composite materials created by means of aerosol deposition.
  
  
  METHODS
  Disk-shaped specimens were fabricated with three resin composites (Estenia C&B, Targis, and Gradia). The specimens were ground flat, and then subjected to aerosol deposition using aluminium oxide submicron particles without inducing a localized temperature rise. The average thickness (AVH) and maximum thickness (Hmax) of the aluminium oxide layer deposited on the resin composite material were measured using a profilometer. Data were analyzed by ANOVA and post hoc Tukey compromise test at α=0.05. The specimen surfaces were also observed using a scanning electron microscope.
  
  
  RESULTS
  The aluminium oxide layer formed on Estenia C&B (AVH 8.1 μm, Hmax 9.1 μm) and Targis (AVH 7.7 μm, Hmax 8.9 μm) were significantly thicker than that on Gradia (AVH 4.2 μm, Hmax 5.4 μm). The micrograph showed that the aluminium oxide layer on Estenia C&B was similar to that on Targis. However, the aerosol deposition area of Gradia was seen relatively rough and partly caved.
  
  
  CONCLUSIONS
  The type of resin composite affected the microstructure of the deposited aluminium oxide layer. The highly filled light- and heat-cured resin composites are advantageous as a target material rather than the lower filled light-cured resin composite.
authors.affiliation: Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8588, Japan. yohsuke@nagasaki-u.ac.jp
authors.forename: Yohsuke
authors.initials: Y
authors.lastname: Taira
authors.forename: Hironori
authors.initials: H
authors.lastname: Hatono
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tokita
authors.forename: Takashi
authors.initials: T
authors.lastname: Sawase
mesh_terms: D000336:Aerosols; D000537:Aluminum Oxide; D002516:Ceramics; D012117:Resins, Synthetic; D013499:Surface Properties
chemical_list: D000336:Aerosols; D012117:Resins, Synthetic; D000537:Aluminum Oxide