title: Effect of the clinical application of the GaAlAs laser in the treatment of dentine hypersensitivity.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effectiveness of the clinical use of the gallium-aluminum-arsenium (GaAlAs) laser at the maximum and minimum energies recommended by the manufacturer for the treatment of dentine hypersensitivity.
  
  
  BACKGROUND
  Dentine hypersensitivity (DH) is a response to a stimulus that would not usually cause pain in a healthy tooth. It is characterized by sharp pain of short duration from the denuded dentin. Its etiology is unknown. The dentin only begins to show sensitivity when exposed to the buccal environment. This exposure can result after removal of the enamel and/or dental cement, or after root denudation. Different treatments are proposed for this disorder.
  
  
  METHODS
  In this study, 25 patients, with a total number of 106 cases of DH, were treated with GaAlAs low-level laser therapy (LLLT). 65% of the teeth were premolars; 14% were incisors and molars; 6.6% were canines. The teeth were irradiated with 3 and 5 J/cm2 for up to six sessions, with an interval of 72 h between each application, and they were evaluated initially, after each application, and at 15 and 60 days follow-up post-treatment.
  
  
  RESULTS
  The treatment was effective in 86.53% and 88.88% of the irradiated teeth, respectively, with the minimum and maximum energy recommended by the manufacturer. There was a statistically significant difference between DH and after a follow-up of 60 days for both groups. The difference among the energy maximum and minimum was not significant.
  
  
  CONCLUSIONS
  The GaAlAs low-level laser was effective in reducing initial DH. A significant difference was found between initial values of hypersensitivity and after 60 days follow-up post-treatment. No significant difference was found between minimum (3 J/cm2) and maximum (5 J/cm2) applied energy.
authors.affiliation: Restorative Dentistry, UNESP School of Dentistry, São José dos Campos, SP, Brazil. analumarsilio@bol.com.br
authors.forename: Ana Lucia
authors.initials: AL
authors.lastname: Marsilio
authors.forename: José Roberto
authors.initials: JR
authors.lastname: Rodrigues
authors.forename: Alessandra Bühler
authors.initials: AB
authors.lastname: Borges
mesh_terms: D000293:Adolescent; D000328:Adult; D003807:Dentin Sensitivity / Q000532:radiotherapy*; D004307:Dose-Response Relationship, Radiation; D005260:Female; D006801:Humans; D028022:Low-Level Light Therapy / Q000379:methods*; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome