| Autor: |
Brito-Júnior M, Faria-e-Silva AL, Camilo CC, de Abreu MHN, Soares JA |
| Zdroj: |
Revista Odonto Ciencia; 2009, Vol. 24 Issue 1, p36-39, 4p |
| Abstrakt: |
Purpose: To evaluate the extraradicular diffusion of creamy 6% hydrogen peroxide (HP) associated or not with sodium perborate (SP) at the cervical region of endodontically treated teeth during intracoronal bleaching. Methods: Thirty-two endodontically treated maxillary canines and central incisors were used. The gutta-percha was removed 3 mm below the cement/enamel junction, and the external root surface was covered with cyanoacrylate except for the cervical region. The teeth were randomly allocated to 4 groups: G1: 6% HP+SP (n=11); G2: 6% HP (n=11); G3: distilled water (negative control, n=5) and G4: 30% HP (positive control, n=5). The specimens were immersed in a solution of potassium chromate (yellow), which turns blue in presence of HP. Two calibrated examiners (Kendall coefficient = 0.936) attributed scores according to the solution color (0 - unaltered color, 1 - light blue, and 2 - dark blue). Data were analyzed by Kruskal-Wallis and Mann-Whitney tests ([alpha]<0.05). Results: Eighteen percent of the 6% HP specimens with or without SP showed color alteration. Only G4 had score values statistically higher than the other groups (P=0.004). Conclusion: It can be concluded that 6% HP cream did not have significant extraradicular diffusion during intracoronal bleaching but it was not 100% safe. [ABSTRACT FROM AUTHOR] |
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