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

Universidade Federal do Para

Status: Completed

Conditions: Low-level Laser Therapy; Dentin Sensitivity; Tooth Bleaching; Clinical Trial

Treatments: Radiation: Low-lever laser; Other: Placebo; Other: Tooth bleaching

Study type: Interventional

Funder types: Other

Identifiers

NCT03514290

UFPara-003

Details and patient eligibility

About

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.

Full 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.

Enrollment: 21 patients

Sex: All

Ages: 18 to 30 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Double Blind

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21 participants in 2 patient groups, including a placebo group

GPLACEBO

Placebo Comparator group

Description:

the laser tip was positioned without the emission of light (placebo effect) + tooth bleaching with 35% hydrogen peroxide (HP).

Treatment:

Other: Tooth bleaching

Other: Placebo

GLASER

Experimental group

Description:

treated with Low-lever laser + tooth bleaching with 35% hydrogen peroxide (HP).

Treatment:

Other: Tooth bleaching

Radiation: Low-lever laser