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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 14, No. 3, 2015, pp. 246-250
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Bioline Code: os15044
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. 3, 2015, pp. 246-250
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Swelling of self-adhesive resin cement increases long-term push-out bond strength of fiber post to dentin
Collares, Fabrício Mezzomo; Leitune, Vicente Castelo Branco; Augusto, Carolina Rocha; Franken, Patrícia & Samuel, Susana Maria Werner
Abstract
Aim: To evaluate the long-term post push-out bond strength to dentin, water sorption, solubility
and swelling of conventional and self-adhesive dual-cure resin cements. Methods: Forty-eight
bovine roots were prepared for fiber post cementation with RelyX ARC and RelyX U100.
According to resin cement and storage time (24 h and 6 months), 4 groups were assessed using
the push-out test. Water sorption and solubility were performed according to ISO 4049:2009. The
swelling coefficient was obtained using cement disks of each material immersed in distilled water
until the swelling equilibrium was reached. The mass of dry and swelled polymer and solvent
density were used to calculate the coefficient. Statistical data analysis was performed using
Student’s t-test for water sorption, solubility and swelling coefficient and the Kruskal-Wallis and
Dunn multiple comparison tests for push-out analysis with a significance level of 0.05. Results:
The immediate bond strength was not significantly different between RelyX ARC (3.09 MPa) and
RelyX U100 (3.78 MPa) (p>0.05). RelyX U100 showed higher (p<0.05) bond strength after six
months of storage (9.60 MPa) than RelyX ARC (6.65 MPa). The water sorption and solubility
values were not significantly different (p>0.05) between groups. The swelling coefficient of the
RelyX U100 group was significantly higher than that of the RelyX ARC group (p<0.05).
Conclusions: RelyX U100 resin cement showed a higher swelling coefficient than RelyX ARC,
and the longitudinal push-out bond strength increased after six months. Clinical significance: The
clinical longevity of restorative treatment in root-filled teeth is dependent on the long-term properties
and behavior of the cement used for post luting. Results of this study suggest that the selfadhesive
resin cement may be a reliable alternative.
Keywords
resin cements; dentin-bonding agents; solubility; water storage
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