Effect of Low-level Laser Therapy on Post-bleaching Sensitivity and Color Change
Study Details
Study Description
Brief 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.
Condition or Disease | Intervention/Treatment | Phase |
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N/A |
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 Design
Arms and Interventions
Arm | Intervention/Treatment |
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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
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Experimental: GLASER treated with Low-lever laser + tooth bleaching with 35% hydrogen peroxide (HP). |
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:
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.
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Outcome Measures
Primary Outcome Measures
- Dental sensitivity induced by office bleaching [change in baseline sensitivity at the 3rd bleaching session]
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).
Secondary Outcome Measures
- Color change promoted by tooth bleaching [change in baseline color at the 3rd bleaching session]
Spectrophotometer was used to measure the color
Eligibility Criteria
Criteria
Inclusion Criteria:
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Do not have previous dental sensitivity
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The canine had to be shade A2 or darker.
Exclusion Criteria:
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Enamel hypoplasia
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Gingival recession
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Dentin exposure
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Visible cracks on buccal enamel
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Pulpitis
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
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1 | Federal University of Pará | Belém | PA | Brazil | 66075-110 |
Sponsors and Collaborators
- Universidade Federal do Para
Investigators
- Principal Investigator: Cecy M Silva, Federal University of Para
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- UFPara-003