The influence of temporary cements on dental adhesive systems for luting cementation Jose ´ C.V. Ribeiro a , Paulo G. Coelho b, *, Malvin N. Janal c , Nelson R.F.A. Silva b , Andre ´ J. Monteiro d , Carlos A.O. Fernandes a a Department of Restorative Dentistry, Federal University of Ceara ´ Dental School, Rua Monsenhor Furtado, S/N, Rodolfo Teo ´ filo, Fortaleza, CE 60438-160, Brazil b Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 East 24th Street, Room 804-S, New York, NY 10010, USA c Department of Epidemiology, New York University College of Dentistry, 345 East 24th Street, Room 804-S, New York, NY 10010, USA d Department of Statistics and Applied Mathematics, Federal University of Ceara ´ , Campus do Pici, Bloco 910, Pici, Fortaleza, CE 60455-760, Brazil journal of dentistry 39 (2011) 255–262 article info Article history: Received 24 August 2010 Received in revised form 7 January 2011 Accepted 11 January 2011 Keywords: Temporary cement Microtensile bond strength Dentine adhesive abstract Objective: This study tested the hypothesis that bond strength of total- and self-etching adhesive systems to dentine is not affected by the presence of remnants from either eugenol-containing (EC) or eugenol-free (EF) temporary cements after standardized cleaning procedures. Methods: Thirty non-carious human third molars were polished flat to expose dentine surfaces. Provisional acrylic plates were fabricated and cemented either with EC, EF or no temporary cements. All specimens were incubated for 7 days in water at 37 8C. The restorations were then taken out and the remnants of temporary cements were mechani- cally removed with a dental instrument. The dentine surfaces were cleaned with pumice and treated with either total-etching (TE) or self-etching (SE) dental adhesive systems. Atomic force microscopy was used to examine the presence of remnants of temporary cements before and after dentine cleaning procedures. Composite resin build-ups were fabricated and cemented to the bonded dentine surfaces with a resin luting cement. The specimens were then sectioned to obtain 0.9 mm 2 beams for microtensile bond strength testing. Fractographic analysis was performed by optical and scanning electron microscopy. Results: ANOVA showed lower mean microtensile bond strength in groups of specimens treated with EC temporary cement than in groups treated with either no cement or an EF cement ( p < 0.05). Mean microtensile bond strength was lower in groups employing the SE rather than the TE adhesive system ( p < 0.001). SE samples were also more likely to fail during initial processing of the samples. There was no evidence of interaction between cement and adhesive system effects on tensile strength. Fractographic analysis indicated different primary failure modes for SE and TE bonding systems, at the dentine-adhesive interface and at the resin cement–resin composite interface, respectively. Conclusion: The use of eugenol-containing temporary cements prior to indirect bonding restorations reduce, to a statistically similar extent, the bond strength of both total- and self- etching adhesive systems to dentine. # 2011 Elsevier Ltd. All rights reserved. * Corresponding author. Tel.: +1 212 998 9365; fax: +1 2120 995 4244. E-mail address: pc92@nyu.edu (P.G. Coelho). available at www.sciencedirect.com journal homepage: www.intl.elsevierhealth.com/journals/jden 0300-5712/$ – see front matter # 2011 Elsevier Ltd. All rights reserved. doi:10.1016/j.jdent.2011.01.004