The effect of dentin pretreatment on the microtensile bond strength of self-adhesive resin cements.
BACKGROUND
Self-adhesive cements have lower bond strength than conventional resin cements that rely on the application of etch-and-rinse adhesive systems.


OBJECTIVE
The purpose of this study was to evaluate the effect of tannic and polyacrylic acid on the microtensile bond strength of self-adhesive resin cements to dentin.


METHODS
Eighteen molar crowns were flattened to expose dentin and divided into 3 groups according to the dentin pretreatment: (1) control, without surface treatment; (2) 25% polyacrylic acid solution (Ketac Conditioner); (3) 20% tannic acid. Composite resin (Tescera) blocks were luted to dentin surfaces using 2 self-adhesive resin cements (RelyX Unicem or Maxcem Elite) (n=3). All specimens were stored in distilled water for 24 hours, sectioned into beams (1 mm(2)), and tested to failure using a microtensile method at a crosshead speed of 1 mm/min. The data were statistically analyzed using 2-way ANOVA and Fisher's PLSD tests (α=.05).


RESULTS
The polyacrylic acid significantly improved the microtensile bond strength of RelyX Unicem (14.92 ±4.94 MPa) when compared to the control group (8.35 ±1.99 MPa) and tannic acid treatment (8.38 ±2.67 MPa) (P<.001). Dentin surface treatment did not affect the microtensile bond strength of Maxcem Elite cemented groups (control, 8.45 ±3.21 MPa; polyacrylic acid, 9.53 ±9.95 MPa; tannic acid, 6.89 ±4.45 MPa).


CONCLUSIONS
Dentin pretreatment with polyacrylic acid improved the microtensile bond strength of RelyX Unicem.
Pavan
Sabrina
S
Department of Restorative Dentistry, University of Illinois at Chicago College of Dentistry, Chicago, IL, USA. sabrinapavan1@hotmail.com
dos Santos
Paulo H
PH
Berger
Sandrine
S
Bedran-Russo
Ana Karina B
AK
D000180:Acrylic Resins / Q000494:pharmacology*; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry* / Q000494:pharmacology; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry / Q000494:pharmacology*; D005899:Glass Ionomer Cements / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D019279:Resin Cements / Q000737:chemistry / Q000494:pharmacology; D018709:Statistics, Nonparametric; D013634:Tannins / Q000494:pharmacology*; D013718:Tensile Strength / Q000187:drug effects
D000180:Acrylic Resins; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; C515955:Maxcem; D019279:Resin Cements; D013634:Tannins; C084550:Vitremer; C006903:carbopol 940