Resumo

NASCIMENTO, Camila Almeida et al. Axial displacement of fluid in glass capillary after intracoronary reaction of several bleaching agents. RSBO (Online) [online]. 2010, vol.7, n.2, pp. 160-165. ISSN 1984-5685.

OBJETIVE: To indirectly quantify the release of oxygen after intracoronary chemical reaction, by axial displacement of fluid in glass capillaries arranged in dental crowns. MATERIAL AND METHODS: Bovine crowns were accessed, the cervical plug was executed and a glass capillary was placed in the vestibular external face, containing an oily vehicle. Following that, four associations of bleaching were prepared and placed in its interior: G1 - sodium perborate and hydrogen peroxide 3%; G2 - sodium perborate and water, G3 - sodium percarbonate and hydrogen peroxide 3%; G4 - sodium percarbonate and distilled water. After being kept for 24 hours, the axial displacement of the fluid was quantified and interpreted as the release of oxygen by the chemical reaction. RESULTS: The results showed a trend of the associations with hydrogen peroxide to promote the release of more oxygen. However, there was no difference between sodium perborate and sodium percarbonate (p > 0.05). CONCLUSION: The experimental groups showed no differences between them during the 24 hours of chemical reaction.

Palavras-chave : bleaching teeth; hydrogen peroxide; sodium perborate; sodium percarbonate.