title: Effects of Tooth Coating Material and Finishing Agent on Bleached Enamel Surfaces by KTP Laser.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the effect of tooth coating material and finishing agent on bleached enamel surfaces after using KTP laser with 27% hydrogen peroxide.
  
  
  BACKGROUND
  There have been few reports on the effects of tooth coating materials and finishing agents after bleaching.
  
  
  METHODS
  After 40 crowns of human extracted maxillary incisors were bleached by KTP laser, bleached enamels were finished with fluoride only or both of fluoride and nano-hydroxyapatite as a finishing agent. After application(s) of fluoride and/or finishing agent, the enamel surfaces were divided into 2 groups, which were covered with the coating material or without coating material. After application of coating materials, all specimens were kept for 2 weeks at 37°C of 100% humidity. After removing the coating material, color changing was measured and enamel surfaces were examined by scanning electron microscopy (SEM).
  
  
  RESULTS
  SEM observation of enamel surfaces treated the fluoride gel, finishing agent and coating material showed the most flattered surface compared to other groups. By measuring the color changing, few color changing was observed on the enamel surfaces treated the fluoride gel, finishing agents and coating material.
  
  
  CONCLUSIONS
  These results suggested that applications of fluoride gel, finishing agent and coating material made the enamel-surfaces flattered and kept effects of bleaching, could prevent the re-coloration. After applications of fluoride gel and finishing agent, covering the bleached-enamel surfaces with the coating material enhanced the keeping whiteness. It would give the patients satisfaction of whiteness.
authors.affiliation: Division of Endodontology, Department of Conservative Dentistry, Showa University School of Dentistry.
authors.forename: Ayumi
authors.initials: A
authors.lastname: Kameda
authors.forename: Yoshiko Murakami
authors.initials: YM
authors.lastname: Masuda
authors.forename: Toko
authors.initials: T
authors.lastname: Teruo
authors.forename: Yoshishige
authors.initials: Y
authors.lastname: Yamada
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Kimura
authors.forename: Yukimichi
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyazaki
keywords: KTP laser; bleached enamel surface; coating material; finishing agent