Evaluation of the Effect of Fluoride and Laser Application on the Prevention of Sensitivity in Bleached Teeth

Evaluation of the Effect of Fluoride and Laser Application on the Prevention of Sensitivity in Bleached Teeth

Effect of Sodium Fluoride at 1.1%, Associated or Not With the Low-level Light Therapy in the Prevention of Post-bleaching Sensitivity: a Randomized, Double-blind, Controlled Trial

To investigate the effects of desensitizing agents on the dental bleaching process, testing the hypothesis that they may prevent dental sensitivity.

The objective of this double blind, randomized and controlled clinical study, was to evaluate the efficacy of 1.1% sodium fluoride associated with LLLT (Low Level Laser Therapy) on teeth that were exposed to 35% hydrogen peroxide during 4 weeks of bleaching treatment. Methods: 25 volunteers were evaluated through the split-mouth model, where the hemiarcates were ranzomized and later allocated in one of the experimental groups: G-FLUOR+LASER - constitutes the group treated with LLLT + 1.1% sodium fluoride; and G-FLUOR - constitutes the group treated with placebo + 1.1% sodium fluoride .

The corresponding hemiarcade received the application of Low Level Laser Therapy as a desensitizing treatment prior to in-office dental bleaching, followed by the application of 1.1% sodium fluoride after dental bleaching.

The correspondent hemiarcade received only the positioning of the inactive laser tip (placebo), prior to in-office dental bleaching, followed by the application of 1.1% sodium fluoride as a desensitizing treatment after dental bleaching

Laser therapy: it was used the infrared spectrum with wavelength of 808 nm in its active environment AsGaAl, in two points: cervical and central-medial region of the incisors, canines and premolars.

Fluoride therapy: 1.1% sodium fluoride 5000 ppm was applied for 5 minutes on the vestibular surface of all pre-bleached dental elements.

Both groups received the in-office bleaching treatment. Three 15-minute applications of the 35% hydrogen peroxide gel were performed, totaling 45 minutes in each of the 4 sessions, with a 7-day interval.

Self reported stimulated pain intensity assessed weekly, by modified visual scale, at baseline, after first, second, third and fourth in-office bleaching application. Each item is scored 0-3 (0 = no pain; 3 = pain as bad as can be).

Self reported non-stimulated pain intensity, assessed daily, by modified visual scale. Each item is scored 0-3 (0 = no pain; 3 = pain as bad as can be).

Return of stimulated pain after one month of the last intervention. Item is scored 0-3 (0 = no pain; 3 = pain as bad as can be).

Inclusion Criteria: Absence of active carious lesions; Good oral hygiene; Do not present hypersensitivity; Do not smoke; Not being pregnant. Exclusion Criteria: Presence of periodontal disease; Presence of cracks or fractures; Presence of restorations and prostheses; Presence of gastroesophageal dysfunction; Patients with severe internal dental dimming.

Reis A, Dalanhol AP, Cunha TS, Kossatz S, Loguercio AD. Assessment of tooth sensitivity using a desensitizer before light-activated bleaching. Oper Dent. 2011 Jan-Feb;36(1):12-7. doi: 10.2341/10-148-CR. Epub 2011 Mar 24.

Moosavi H, Arjmand N, Ahrari F, Zakeri M, Maleknejad F. Effect of low-level laser therapy on tooth sensitivity induced by in-office bleaching. Lasers Med Sci. 2016 May;31(4):713-9. doi: 10.1007/s10103-016-1913-z. Epub 2016 Mar 10.

http://aplicacao.saude.gov.br/plataformabrasil/visao/pesquisador/gerirPesquisa/gerirPesquisaAgrupador.jsf