Effect of temporary cements on the microtensile bond strength of self-etching and self-adhesive resin cement.
OBJECTIVE
The aim of this study was to evaluate the microtensile bond strength (µTBS) of self-etching and self-adhesive resin cement systems to dentin affected by the presence of remnants of either eugenol-containing or eugenol-free temporary cements.


METHODS
Thirty extracted teeth were obtained and a flat dentin surface was exposed on each tooth. Acrylic blocks were fabricated and cemented either with one of two temporary cements, one zinc oxide eugenol (ZOE) and one eugenol free (ZOE-free), or without cement (control). After cementation, specimens were stored in water at 37°C for 1 week. The restorations and remnants of temporary cements were removed and dentin surfaces were cleaned with pumice. Resin composite blocks were cemented to the bonded dentin surfaces with one of two resin cements, either self-etching (Panavia F 2.0) or self-adhesive (RelyX U-100). After 24 h, the specimens were sectioned to obtain beams for submission to µTBS. The fracture mode was evaluated under a stereoscopic loupe and a scanning electron microscope (SEM). Data from µTBS were submitted to two-way repeated-measure ANOVA and the Tukey test (alpha = 0.05).


RESULTS
The cross-product interaction was statistically significant (p < 0.0003). The presence of temporary cements reduced the bond strength to Panavia self-etching resin cements only (p < 0.05). Fracture occurred predominantly at the dentin-adhesive interface.


CONCLUSIONS
The presence of eugenol-containing temporary cements did not interfere in the bond strength to dentin of self-adhesive resin cements.
School of Dentistry, University Federal of Maranhão (UFMA) , São Luis, Maranhão , Brazil.
Edilausson Moreno
EM
Carvalho
Ceci Nunes
CN
Carvalho
Alessandro Dourado
AD
Loguercio
Darlon Martins
DM
Lima
José
J
Bauer
D000134:Acid Etching, Dental / Q000379:methods; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; C438843:Panavia-Fluoro; C587242:RelyX U200; D019279:Resin Cements; D015035:Zinc Oxide-Eugenol Cement; C449162:zinc oxide-non-eugenol cement; D014867:Water; D015034:Zinc Oxide
dentin; microtensile bond strength; self-adhesive luting cement; temporary cement