Resumo

SOUZA, Grazielle Morais de; RASQUIN, Luis Cardoso  e  CARVALHO, Fabíola Bastos de. Infiltration of Rhodamin B into three materials used as cervical barrier. RGO, Rev. gaúch. odontol. (Online) [online]. 2014, vol.62, n.3, pp. 235-242. ISSN 1981-8637.

Objective To evaluate in vitro the sealing ability of three materials used as cervical barrier for internal dental bleaching. Methods Thirty-three canines were selected, and after biomechanical root canal preparation, the canals were filled by lateral condensation technique. After the filling material setting reaction, the teeth were randomly divided into three groups of ten teeth each, according to the following materials for constructing the cervical barrier: X Temp LC; Vitro Fil; Coltosol. The control group consisted of three teeth, without placement of the cervical cap. Sodium perborate /distilled water associated with 2% Rhodamin B were used as bleaching substance. After placing the bleaching agent in the pulp chamber, access cavities were sealed with temporary cement IRM and samples were stored at 37 ° for 7 days. After this period, the samples were cleaved longitudinally, and leakage was evaluated by the visual method. The data were submitted to Pearson test with a 5% level of significance. Results No statistically significant difference was found between the study groups, however, the largest number of specimens with a lower degree of leakage were found in the Coltosol group. Conclusion All the materials evaluated for making the cervical cap allowed some level of leakage.

Palavras-chave : Nonvital tooth.; Tooth bleaching.; Tooth resorption..