Dental Materials
Volume 25, Issue 4 , Pages 442-451, April 2009

Influence of surface treatments on the bond strength of repaired resin composite restorative materials☆

  • Sinval A. Rodrigues Junior

      Affiliations

    • Department of Operative Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil
    • Corresponding Author InformationCorresponding author at: Federal University of Pelotas, School of Dentistry-Department of Operative Dentistry, Gonçalves Chaves 457, Pelotas, RS 96015-560, Brazil. Tel.: +55 53 32226690; fax: +55 53 32255581.
    • ,
  • Jack L. Ferracane

      Affiliations

    • Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, Oregon Health & Science University, Portland, OR, USA
    • ,
  • Álvaro Della Bona

      Affiliations

    • School of Dentistry, University of Passo Fundo, P.O. Box 611/613, Passo Fundo, RS 99001-970, Brazil

Received 14 April 2008; received in revised form 27 August 2008; accepted 29 September 2008.

Abstract 

Objectives

The purpose of this study was to investigate the effect of different surface treatments on the bond strength (σ) of repaired, aged resin composites (ARC).

Methods

Forty blocks of Filtek Z250™ (Z2) and Filtek Supreme™ (SU) were made, stored in deionized water for 9 days, and randomly assigned to different surface treatment groups: hydrofluoric acid etching (HA), abrasion using a coarse diamond bur (AB), sandblasting with alumina particles (AO), and silica coating (SC). The average roughness (Ra) of the treated surfaces was measured with a profilometer. An adhesive system (SB-Adper Single Bond Plus™), a silane (SI) or a combination of both (SI+SB) were applied after each surface treatment. The blocks were restored with the same composite (RC) and cut to produce bars that were turned into dumbbell-shaped specimens (0.5mm2) using a precision grinding machine. The specimens (n=30) were tested in tension to fracture and the microtensile bond strength (σ) values were calculated (MPa). Data were analyzed using three-way ANOVA/Tukey test (α=0.05) and Weibull statistics.

Results

AO and SC produced similar Ra values, which were greater than the value produced by HA. The σ values were statistically influenced by the type of RC (p<0.0001), by the surface treatment (p<0.0001) and by the surface coating (p<0.0001). Treating the surface of Z2 with SC+SB produced the greatest m value.

Significance

AO and SC produced the greatest σ values, irrespective of the primer (SI, SB or SI+SB) used. Yet, the RC microstructure influenced the mean σ values, which were greater for Z2 than for SU. The HA should not be used for repairing ARC.

Keywords: Microtensile bond strength, Composite resin, Repair, Surface treatment, Adhesion, Weibull statistics

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☆ This project was funded by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), Grant no. 3640/05-1.

PII: S0109-5641(08)00237-6

doi:10.1016/j.dental.2008.09.009

Dental Materials
Volume 25, Issue 4 , Pages 442-451, April 2009

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