title: Long-term effects of CO2 laser irradiation on treatment of hypersensitive dental necks: results of an in Vivo study.
abstract: OBJECTIVE
  The present in vivo study was performed to examine the long-term effects of combined CO2 laser treatment and fluoridation on hypersensitive dental necks.
  
  
  BACKGROUND
  Attempts have been made to treat dental hypersensitivity by sealing exposed dentinal tubules, primarily using fluoride preparations, strontium chloride, and hydroxyapatite. However, these treatment methods have the disadvantage that the preparation is effective only for a limited period of time and must be applied repeatedly, at short intervals. The CO2 laser has been shown to have an excellent sealing effect on hypersensitive dentinal surfaces.
  
  
  METHODS
  Test subjects suffering from dentinal hypersensitivity were recruited from the patients of the Department of Conservative Dentistry, School of Dentistry of the University of Vienna, Austria and treated with combined laser irradiation and fluoridation with stannous fluoride gel. The patients were followed up for a period of 18 months. In vivo examinations were supplemented by atomic absorption spectroscopy (AAS) of tiny dentin samples obtained from the dental necks 6 weeks and 18 months after laser treatment and by scanning electron microscopy (SEM).
  
  
  RESULTS
  Compared to conventional fluoridation, combined laser irradiation and fluoridation was shown to be effective in the treatment of hypersensitive dental necks. When success was defined as complete freedom from pain, the success rate in the laser group was 96.5%. Furthermore, examinations of irradiated teeth under the scanning electron microscope still revealed complete closure of the dentinal tubules four and six months after laser treatment. AAS showed that tin was present in the samples, which indicates that combined laser treatment and fluoridation result in permanent integration of fluoride in the dentin surface.
  
  
  CONCLUSIONS
  Based on these results, the CO2 laser can be recommended as an ideal tool for desensitization of dental necks.
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, University of Vienna, Austria.
authors.forename: A
authors.initials: A
authors.lastname: Moritz
authors.forename: U
authors.initials: U
authors.lastname: Schoop
authors.forename: K
authors.initials: K
authors.lastname: Goharkhay
authors.forename: M
authors.initials: M
authors.lastname: Aoid
authors.forename: P
authors.initials: P
authors.lastname: Reichenbach
authors.forename: M A
authors.initials: MA
authors.lastname: Lothaller
authors.forename: J
authors.initials: J
authors.lastname: Wernisch
authors.forename: W
authors.initials: W
authors.lastname: Sperr
mesh_terms: D000328:Adult; D002245:Carbon Dioxide; D003804:Dentin / Q000187:drug effects / Q000528:radiation effects / Q000648:ultrastructure; D003807:Dentin Sensitivity / Q000188:drug therapy / Q000532:radiotherapy*; D005260:Female; D005782:Gels / Q000627:therapeutic use; D006801:Humans; D053685:Laser Therapy; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D009354:Neodymium; D010147:Pain Measurement; D014002:Tin Fluorides / Q000627:therapeutic use; D019237:Tooth Cervix / Q000528:radiation effects* / Q000648:ultrastructure; D016896:Treatment Outcome
chemical_list: D005782:Gels; D014002:Tin Fluorides; D002245:Carbon Dioxide; D009354:Neodymium