Evaluation of Dental Bleaching In-office

This randomized, blind controlled trial has the objective of evaluate colorimetric changes after supervised whitening treatment, in-office, using Violet LED light of 405 nm associated or not to the use of carbamide peroxide 35% gel. Eighty patients, of which 20 with aesthetics desires to be submitted to gingivoplasty surgery, will be divided into four groups. Group 1 will receive whitening only with Violet LED light (405 nm). Group 2 will receive a whitening treatment combination of Violet LED light with carbamide peroxide 35% gel. Patients of Group 3 will receive a whitening treatment with hydrogen peroxide 35% and Group 4 will be submitted to the gingivoplasty surgery procedure, for aesthetic desire, after whitening treatment with Violet LED light (405 nm) without gel. The colorimetric changes will be measured before, right after each whitening session in the end of the period of 3 months, through the Vitapan Classical (Vita) color scale, and by digital spectrophotometer (SpectroShade™ Micro MHT Optic Research). The sensibility degree will be measured by the Visual Analogue Scale (VAS) in each session and in all groups. The gum tissues removed during the gingivoplasty in Group 4, will be histomorphometric analyzed to measure possible inflammatory gum changes by the Violet LED light (405 nm) irradiation. The degree of satisfaction of the patient and the life quality after aesthetic result achieved will be evaluated. The results will be presented by means and standard deviation. After checking the normality of the data, a one-way ANOVA will be performed. In case the data do not follow a normal distribution, it will be utilized the Kruskal-Wallis test and a value of p <0.05.

Inclusion criteria

• negative medical history,
• Good systemic and oral health
• Patients with aesthetic complaint of discoloration of upper and lower teeth
• Patients with aesthetic desire for gingivoplasty, regardless of color in the baseline (Group 4), without the need for a prosthetic procedure and with sufficient gingiva inserted
• Color in the baseline higher than the A2 of the vita scale for groups 1, 2 and 3.

Exclusion criteria

• Patients with dentin hypersensitivity, incisal and occlusal wear or open cavities;
• Patients with pulp alterations;
• Carriers of dental anomalies;
• Patients with dental fractures who do not have restorations on the buccal surface of the teeth to be cleared;
• Patients who have had dental bleaching for less than 2 years;
• Holders of fixed appliances, orthopedic;
• Teeth pigmented by intrinsic factors;
• Smokers;
• Pregnant and Infants;
• Patients reporting adverse reactions to Hydrogen Peroxide;
• Patients who are taking ferrous sulfate medication;
• Patients who use chronic decorticosteroids, as well as volunteers who are taking analgesics or anti-inflammatories.
• Individual or removable prosthesis holders on the analyzed teeth will also be excluded or patients with endodontically treated teeth (Teeth 15-25 and 45-35).