Effect of Low-level Laser Therapy on Post-bleaching Sensitivity and Color Change
Condition: Tooth Bleaching; Low-level Laser Therapy; Dentin Sensitivity; Clinical Trial
MeSH terms: Dentin Sensitivity; Hypersensitivity
Study type: Interventional

Summary: 
      Objective: The objective of this clinical study was to evaluate low-level laser (LLL) therapy
      in tooth sensitivity and in effecting color change after in-officer bleaching treatment
      across three weeks of treatment.

      Methods: Twenty-one volunteers were evaluated through the split-mouth model, so that the
      right and left maxillary/mandibular quadrants were randomized and allocated to one of two
      groups: GPLACEBO - the laser tip was positioned without the emission of light (placebo
      effect) + tooth bleaching with 35% hydrogen peroxide (HP); GLASER - treated with LLL + tooth
      bleaching with 35% HP. To assess tooth sensitivity, a modified visual analogue scale (VAS)
      was used after an evaporative stimulus (stimulated pain) and a daily pain questionnaire
      (unstimulated pain) was also applied. A spectrophotometer was used to measure the color.
      Three bleaching sessions were performed, with intervals of 7 days. Sensitivity results were
      tested using Friedman test for intra-group evaluation and Wilcoxon test for inter-group
      evaluation and ANOVA for color change.
    

Detailed description: 
      Twenty-one volunteers were evaluated through the split-mouth model, so that the right and
      left maxillary/mandibular quadrants were randomized and allocated to one of two groups:
      GPLACEBO - the laser tip was positioned without the emission of light (placebo effect) +
      tooth bleaching with 35% hydrogen peroxide (HP); GLASER - treated with LLL + tooth bleaching
      with 35% HP. To assess tooth sensitivity, a modified visual analogue scale (VAS) was used
      after an evaporative stimulus (stimulated pain) and a daily pain questionnaire (unstimulated
      pain) was also applied. A spectrophotometer was used to measure the color. Three bleaching
      sessions were performed, with intervals of 7 days.
    

Intervention name(s): Low-lever laser; Tooth bleaching; Placebo
Intervention type(s): Radiation; Other; Other
Intervention description(s): Received Low-lever laser therapy using the infrared spectrum, with a wavelength of 808 nm in its active medium AsGaAl (arsenic-gallium-aluminum), at two points: on the central of cervical and medial regions of incisors, canines and premolars in the corresponding hemi-arch. At each point, 60 J/cm2 was applied during 16 seconds with an irradiance of 3.75 W/cm² using the therapeutic visible infrared device.; Three 15-minute applications of 35% hydrogen peroxide gel (Whiteness HP, FGM®, Joinville, SC, Brazil) were carried out, totaling 45 minutes in each of the four bleaching sessions, with an one-week interval between applications.; The laser tip was positioned similarly to experimental group but without light irradiation
Other intervention name(s): Laserterapy
Allocation: Randomized
Intervention model: Crossover Assignment
Intervention model description: Twenty-one volunteers were evaluated through the split-mouth model, so that the right and left maxillary/mandibular quadrants were randomized and allocated to one of two groups: GPLACEBO - the laser tip was positioned without the emission of light (placebo effect) + tooth bleaching with 35% hydrogen peroxide (HP); GLASER - treated with LLL + tooth bleaching with 35% HP.
Masking: Double (Participant, Investigator)
Primary purpose: Treatment
Keywords: Laser; Color