title: Desensitizing effects of an Er:YAG laser on hypersensitive dentine.
abstract: OBJECTIVE
  The aim of the present study was to evaluate and compare the desensitizing effects of an Er:YAG laser (KEY II(R), KaVo, Germany) and Dentin Protector (Vivadent, Germany) on cervically exposed hypersensitive dentine.
  
  
  METHODS
  A group of 30 patients showing a total of 104 contralateral pairs of hypersensitive and caries-free teeth was selected and randomly allocated in a split-mouth design to either (1) Er:YAG laser (80 mJ/pulse, 3 Hz), or (2) the application of Dentin Protector (polyurethane-isocyanate 22.5%; methylenechloride 77.5%) whereat one pair served as an untreated control in each patient. The degree of sensitivity to a thermal stimulus was determined qualitatively with an evaporative stimulus defined as a 3-s air blast at a distance of 2 mm from each site to be tested. A qualitative registration of the degree of discomfort was determined according to an arbitrary pain scale in 4 degrees. Recordings were assessed before treatment, immediately after, 1 week, 2 and 6 months after treatment by 1 blinded examiner.
  
  
  RESULTS
  Both treatment forms resulted in significant improvements of discomfort immediately after and 1 week post treatment. After 2 months, the discomfort in the Dentin Protector(R) group increased up to 65% of the baseline score and even up to 90% after 6 months, whereas the effect of the laser remained at the same level that was achieved immediately after treatment. The differences immediately after, 1 week, 2 and 6 months post treatment between both groups were statistically high significant (p< or =0.001; respectively). Compared to the untreated control group, both treatment forms resulted in a significant reduction of discomfort at each follow-up examination.
  
  
  CONCLUSIONS
  It was concluded that desensitizing of hypersensitive dentine with an Er:YAG laser is effective and the maintenance of the positive result was more prolonged than with Dentin Protector.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ludwig Maximilians University, Munich, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Schwarz
authors.forename: Nicole
authors.initials: N
authors.lastname: Arweiler
authors.forename: Thomas
authors.initials: T
authors.lastname: Georg
authors.forename: Elmar
authors.initials: E
authors.lastname: Reich
mesh_terms: D000328:Adult; D003738:Dental Cements / Q000627:therapeutic use; D003807:Dentin Sensitivity / Q000628:therapy*; D004871:Erbium; D005260:Female; D006801:Humans; D053685:Laser Therapy; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D016037:Single-Blind Method; D018709:Statistics, Nonparametric; D016896:Treatment Outcome
chemical_list: D003738:Dental Cements; C075332:Dentin Protector; D004871:Erbium