Does Adhesive Thickness Affect Resin-dentin Bond Strength After Thermal/Load Cycling?

Autor(es)

Lodovici, E. ^[1] ; Reis, A. ^[2] ; Geraldeli, S. ^{[3, 4]} ; Ferracane, J. L. ^[5] ; Ballester, R. Y. ^[1] ; Filho, L. E. R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biochem, Sao Paulo - Brazil

^[2] Univ Estadual Ponta Grossa, Dept Restorat Dent, Ponta Grossa, Parana - Brazil

^[3] Univ Iowa, Dows Inst Dent Res, Iowa City, IA - USA

^[4] Univ Iowa, Dept Operat Dent, Iowa City, IA - USA

^[5] Oregon Hlth & Sci Univ, Sch Dent, Dept Restorat Dent, Portland, OR 97201 - USA

• Tipo de documento: Artigo Científico
• Fonte: Operative Dentistry; v. 34, n. 1, p. 58-64, JAN-FEB 2009.
• Citações Web of Science: 21

Resumo

This study evaluated the influence of adhesive layer thickness (ADL) on the resin-dentin bond strength of two adhesive systems (AS) after ther-mal and mechanical loading (TML). A flat superficial dentin surface was exposed with 600-grit SiC paper on 40 molars. After primer application, the adhesive layer of Scotchbond Multipurpose (SBMP) or Clearfil SE Bond (CSEB) was applied in one or two layers to a delimited area (52 mm(2)) and resin blocks (Filtek 2250) were built incrementally: Half of the sample was stored in distilled water (37 C, 24 hours) and submitted to thermal (1,000; 5 degrees-55 degrees C) and mechanical cycles (500,000; 10kgf) {[}TML]. The other half was stored in distilled water (72 hours). The teeth were then sectioned to obtain sticks (0.8 mm(2)) to be tested under tensile mode (1.0 mm/minute). The fracture mode was analyzed at 400x. The BS from all sticks from the same tooth was averaged for statistical purposes. The data was analyzed by three-way ANOVA. The x(2) test was used (p<0.05) to compare the frequency of pre-testing failure specimens. Higher BS values were observed for SBMP regardless of the ADL. The TML reduced the BS values irrespective of the adhesive employed and the ADL. A higher frequency of pre-testing failure specimens was observed for the cycled groups. A thicker adhesive layer, acting as an intermediate flexible layer, did not min-imize the damage caused by thermal/mechanical load cycling for a three-step etch-and-rinse and two-step self-etch system. (AU)

• Processo FAPESP: 03/12192-0 - 1. Estudo da longevidade da união de adesivos autocondicionantes aplicados ao esmalte de dentes permanentes: morfologia, fendas e resistência. 2. Resistência da união de sistemas adesivos ao esmalte
• Beneficiário: Rosa Helena Miranda Grande
• Modalidade de apoio: Auxílio à Pesquisa - Regular