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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 14, No. 2, 2015, pp. 125-129
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Bioline Code: os15021
Full paper language: English
Document type: Research Article
Document available free of charge
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Brazilian Journal of Oral Sciences, Vol. 14, No. 2, 2015, pp. 125-129
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Influence of phosphate buffered saline on the bond strength of endodontic cement to dentin
Cechella, Bruna Casagrande; de Almeida, Josiane; Felippe, Mara Cristina Santos; Teixeira, Cleonice da Silveira; Bortoluzzi, Eduardo Antunes & Felippe, Wilson Tadeu
Abstract
Aim: To analyze the influence of exposure and time of exposure to phosphate buffered saline
(PBS) on the push-out bond strength (BS) of Biodentine to dentine. Methods: Eighty 2-mm-thick
dentin discs were obtained from transversal sections of human teeth roots. The space of the canal
was enlarged using #2–#5 Gates-Glidden burs to obtain 1.3-mm-diameter standardized cavities.
The discs were immersed in 17% EDTA followed by 1% NaOCl and dried. The spaces of the
canals were filled with Biodentine and the samples were divided into 2 groups (n=40) according
to the storage: G1: exposure to moistened cotton pellet; G2: exposure to PBS. After 30 min, 1, 3
and 28 days, 10 samples of each group were subjected to the push-out test. Data were analyzed
using ANOVA and Tukey test (p < 0.05). Results: The specimens exposed to PBS had lower BS
(p < 0.05), except for the 1-day period (p = 0.6017). In specimens of Group 1 the BS increased
up to 3 days (p < 0.05). In specimens in Group 2, the BS increased from 30 min to 1 day (p <
0.0001) and remained stable up to 3 days (p = 0.9876). At 28 days, a significant decrease was
observed in the BS values of both groups (p < 0.05). Conclusions: The exposure of Biodentine
to PBS led to lower BS values. In general, the BS increased gradually up to 3 days and reduced
at 28 days.
Keywords
endodontics; dental materials; dentin
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