title: Scanning Electron Microscope (SEM) Evaluation of Composite Surface Irradiated by Different Powers of Er:YAG Laser.
abstract: BACKGROUND
  The aim of this study was to evaluate the composite surface treated by different powers of Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser in comparison with bur preparation via scanning electron microscope.
  
  
  METHODS
  Fourteen composite resin blocks with 15× 10 × 10 mm dimensions were used in this study. The samples were divided to seven groups as follow: Group 1 (power: 1 W, Energy: 50 mJ); Group 2 (power: 2 W, Energy: 100 mJ); Group 3 (power: 3W, Energy: 150 mJ); Group 4 (power: 4 W, Energy: 200 mJ); Group 5 (power: 5W, Energy: 250 mJ); Group 6 (power: 6 W, Energy: 300 mJ); Group 7: Diamond bur. Then, the samples were prepared for SEM examination.
  
  
  RESULTS
  The surface treated by Er:YAG laser showed irregular and micro porous surface.
  
  
  CONCLUSIONS
  It seems that composite surface treatment by Er:YAG laser can be an alternative method for composite repair if suitable parameters are used.
authors.affiliation: Laser Research Center of Dentistry (LRCD), Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Ardavan
authors.initials: A
authors.lastname: Etemadi
authors.affiliation: Dental biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sima
authors.initials: S
authors.lastname: Shahabi
authors.affiliation: Laser Research Center of Dentistry (LRCD), Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Nasim
authors.initials: N
authors.lastname: Chiniforush
authors.affiliation: School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Edris
authors.initials: E
authors.lastname: Pordel
authors.affiliation: School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Azarbayejani
authors.affiliation: Dental biomaterials Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Soolmaz
authors.initials: S
authors.lastname: Heidari
keywords: Er-YAG laser; SEM; composite resin