title: Effect of engraving speeds of CO₂ laser irradiation on In-Ceram Alumina roughness: a pilot study.
abstract: OBJECTIVE
  The aim of the study was to determine the effect of CO₂ laser on surface roughness of In-Ceram-Alumina-ceramic.
  
  
  METHODS
  Four aluminum-oxide ceramic disc specimens were prepared of In-Ceram Alumina. Discs received CO₂ laser irradiation with different engraving speeds (100, 400, 600 and 800 mm/min) as a surface treatment. The roughness of the surfaces was measured on digital elevation models reconstructed from stereoscopic images acquired by scanning-electron-microscope. Surface roughness data were analyzed with One-Way-Analysis-of-Variance at a significance level of p<0.05.
  
  
  RESULTS
  There was no significant difference between the roughness values (p=0.82). Due to higher laser durations, partial melting signs were observed on the surfaces. Tearing, smearing and swelling occurred on melted surfaces. Swelling accompanying melting increased the surface roughness, while laser power was fixed and different laser engraving speeds were applied.
  
  
  CONCLUSIONS
  Although different laser irradiation speeds did not affect the roughness of ceramic surfaces, swelling was observed which led to changes on surfaces.
authors: Department of Prosthodontics, Faculty of Dentistry, Hacettepe University , Ankara , Turkey.
authors: Bahadır
authors: B
authors: Ersu
authors: Orkun
authors: O
authors: Ersoy
authors: Bulem
authors: B
authors: Yuzugullu
authors: Senay
authors: S
authors: Canay
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry / Q000528:radiation effects; D002516:Ceramics / Q000737:chemistry / Q000528:radiation effects; D045662:Dental Etching / Q000295:instrumentation*; D003776:Dental Porcelain / Q000737:chemistry / Q000528:radiation effects*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D054020:Lasers, Gas; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010865:Pilot Projects; D011829:Radiation Dosage; D013499:Surface Properties; D013997:Time Factors
chemical_list: C483026:In-Ceram Alumina; D003776:Dental Porcelain; C023506:Glass ceramics; D000537:Aluminum Oxide
keywords: CO2 laser; digital elevation models; glass-infiltrated alumina-ceramic; scanning electron microscope; surface roughness