THE EFFECT OF DENTIN PRETREATMENT ON THE MICROTENSILE BOND STRENGTH OF SELF-ADHESIVE RESIN CEMENTS

Autor(es)

Pavan, Sabrina ^[1] ; dos Santos, Paulo H. ^[2] ; Berger, Sandrine ^[3] ; Bedran-Russo, Ana Karina B. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Illinois, Coll Dent, Dept Restorat Dent, Chicago, IL - USA

^[2] Univ Estadual Paulista, Dept Dent Mat & Prosthodont, Aracatuba Sch Dent, Sao Paulo - Brazil

^[3] Univ Estadual Campinas, Dept Restorat Dent, Dent Sch Piracicaba, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHETIC DENTISTRY; v. 104, n. 4, p. 258-264, OCT 2010.
• Citações Web of Science: 30

Resumo

Statement of problem. Self-adhesive cements have lower bond strength than conventional resin cements that rely on the application of etch-and-rinse adhesive systems. Purpose. 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. Material and 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 (alpha=.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. (J Prosthet Dent 2010; 104:258-264) (AU)

• Processo FAPESP: 08/03213-7 - Efeito de agentes de ligação cruzada no colágeno no envelhecimento das interfaces restauradoras adesivas: avaliação das propriedades nano-mecânicas
• Beneficiário: Paulo Henrique dos Santos
• Modalidade de apoio: Bolsas no Exterior - Novas Fronteiras