Evaluation of surface roughness and color change of bovine enamel after immersion in dye solution

Aim: The aim of this in vitro study was to evaluate the influence of dye solution on enamel color change after bleaching protocols and the effectiveness in maintaining the color of these agents. Material and Methods: The buccal surfaces of sixty-five bovine incisors were cleaned and polished, and the enamel specimens were divided into thirteen groups: G1 to G6: treated with 6% hydrogen peroxide using different surface agents; G7 to G12: treated with 15% hydrogen peroxide using different surface agents; G13: control. After 24 hours, the groups treated were immersed in black tea solution; the control group was stored in artificial saliva. The color was evaluated prior to bleaching, 24 hours later and after immersion in the dye solution; the roughness was measured immediately after bleaching, 24 hours later and 7 days after immersion in the dye solution. The data was analyzed using the Kruskal-Wallis test, followed by the Miller test for roughness analysis, and the Duncan test for color change analysis. It was used 5% significant level with p<0.05. Results: The data found in the evaluation of surface roughness after bleaching indicated a reduction of roughness in all the groups. The surface agent Bifluoride, when applied, showed an increase in roughness after its application and it decreases after immersion in dye solution; the surface agent Desensibilize and the XP Bond adhesive showed greater color alteration after immersion in dye solution. Conclusions: All the groups studied, under different whitening technique, were effective in promoting whitening.

Associação de técnicas conservadoras para otimizar a estética do sorriso: clareamento dental e microabrasão do esmalte / Association of conservative techniques an aesthetically optimization smile: dental bleaching and microabrasion

As várias opções para a realização de tratamentos estéticos conservadores permitem ao profissional a escolha de materiais e técnicas apropriados, que melhor se enquadrem nas características individuais de cada paciente e na realidade de seu consultório. No caso clínico apresentado, a técnica de clareamento dental em consultório com peróxido de hidrogênio a 35% (Total Blanc Office, DFL), ativado com luz híbrida LED/LASER e a microabrasão de esmalte com pasta de acido fosfórico a 37% e pedra pomes, foram associados. Os resultados com o clareamento em consultório são imediatos, de forma que o profissional dispõe de total controle sobre aplicação do gel clareador em áreas e dentes específicos. A microabrasão do esmalte é um tratamento simples e custo relativamente baixo, remove as manchas superficiais do esmalte com preservação de estrutura dental. No caso apresentado, a associação das duas técnicas proporcionou a obtenção de excelente resultado estético em apenas uma sessão de atendimento

Since there are several options of conservative aesthetic treatments the dentist may choose the most appropriate material and technique according to each patient’s needs. In the present case report, an in office bleaching procedure using 35% of hydrogen peroxide (Total Blanc Office, DFL), activated with a hybrid light source (LED/Diode laser) associated to enamel microabrasion using a 37% phosphoric acid and a pumice, was performed as a conservative treatment. Clinical results of in office bleaching technique are immediate, since the professional can apply the gel in specific areas. The enamel abrasion is a simple and low-cost dental treatment that removes superficial dental stains preserving the dental structure. In the reported case, the association of these two techniques has reached an excellent aesthetic result in one single session of treatment