Effect of Low-level Laser Therapy on Post-bleaching Sensitivity and Color Change

Effect of Low-level Laser Therapy on Post-bleaching Sensitivity and Color Change: a Clinical, Randomized and Double-blind Study

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.

Study Overview

• Status: Completed
• Conditions: Dentin Sensitivity; Tooth Bleaching; Clinical Trial; Low-level Laser Therapy
• Intervention / Treatment: Other: Tooth bleaching; Other: Placebo; Radiation: Low-lever laser

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.

• Study Type: Interventional
• Enrollment (Actual): 21
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Brazil
  • PA
    • Belém, PA, Brazil, 66075-110
      • Federal University of Pará

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 30 years (ADULT)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Do not have previous dental sensitivity
• The canine had to be shade A2 or darker.

Exclusion Criteria:

• Enamel hypoplasia
• Gingival recession
• Dentin exposure
• Visible cracks on buccal enamel
• Pulpitis

Study Plan

How is the study designed?

Design Details

• Primary Purpose: TREATMENT
• Allocation: RANDOMIZED
• Interventional Model: CROSSOVER
• Masking: DOUBLE

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
PLACEBO_COMPARATOR: GPLACEBO; the laser tip was positioned without the emission of light (placebo effect) + tooth bleaching with 35% hydrogen peroxide (HP).	Other: Tooth bleaching; 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.; Other: Placebo; The laser tip was positioned similarly to experimental group but without light irradiation
EXPERIMENTAL: GLASER; treated with Low-lever laser + tooth bleaching with 35% hydrogen peroxide (HP).	Other: Tooth bleaching; 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.; Radiation: Low-lever laser; 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.; Other Names: Laserterapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Dental sensitivity induced by office bleaching	Evaporative stimulus (stimulated pain) using air jet from a triple syringe and a daily pain questionnaire (unstimulated pain). Both methods were associated with a modified visual analogue scale was used: 0 (pain absent); 1 (mild pain); 2 (moderate pain) and 3 (severe pain).	change in baseline sensitivity at the 3rd bleaching session

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Color change promoted by tooth bleaching	Spectrophotometer was used to measure the color	change in baseline color at the 3rd bleaching session

Collaborators and Investigators

• Sponsor: Universidade Federal do Para
• Investigators: Principal Investigator: Cecy M Silva, Federal University of Pará

Study record dates

Study Major Dates

• Study Start (ACTUAL): July 11, 2016
• Primary Completion (ACTUAL): August 8, 2016
• Study Completion (ACTUAL): September 30, 2016

Study Registration Dates

• First Submitted: March 15, 2018
• First Submitted That Met QC Criteria: April 30, 2018
• First Posted (ACTUAL): May 2, 2018

Study Record Updates

• Last Update Posted (ACTUAL): May 2, 2018
• Last Update Submitted That Met QC Criteria: April 30, 2018
• Last Verified: April 1, 2018

More Information

Terms related to this study

• Keywords: Laser; Color
• Additional Relevant MeSH Terms: Immune System Diseases; Stomatognathic Diseases; Tooth Diseases; Hypersensitivity; Dentin Sensitivity
• Other Study ID Numbers: UFPara-003

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No