EFFECT OF METAL PRIMERS ON MICROTENSILE BOND STRENGTH BETWEEN ZIRCONIA AND RESIN CEMENTS

Autor(es)

Dias de Souza, Grace M. ^[1] ; Thompson, Van P. ^[2] ; Braga, Roberto R. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Toronto, Fac Dent, Toronto, ON M5S 1A1 - Canada

^[2] NYU, Coll Dent, Dept Biomat & Biomimet, New York, NY - USA

^[3] Univ Sao Paulo, Sch Dent, Dept Dent Mat, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHETIC DENTISTRY; v. 105, n. 5, p. 296-303, MAY 2011.
• Citações Web of Science: 38

Resumo

Statement of problem. There are no established clinical procedures for bonding zirconia to tooth structure using resin cements. Purpose. The purpose of this study was to evaluate the influence of metal primers, resin cements, and aging on bonding to zirconia. Material and methods. Zirconia was treated with commercial primers developed for bonding to metal alloys (Metaltite, Metal Primer II, Alloy Primer or Totalbond). Non-primed specimens were considered as controls. One-hundred disk-shaped specimens (19 x 4 mm) were cemented to composite resin substrates using Panavia or RelyX Unicem (n=5). Microtensile bond strength specimens were tested after 48 hours and 5 months (150 days), and failure modes were classified as type 1 (between ceramic/cement), 2 (between composite resin/cement) or 3 (mixed). Data were analyzed by 3-way ANOVA and Multiple Comparison Tukey test (alpha=.05). Results. The interactions primer/luting system (P=.016) and luting system/storage time (P=.004) were statistically significant. The use of Alloy Primer significantly improved the bond strength of RelyX Unicem (P<.001), while for Panavia, none of the primers increased the bond strength compared to the control group. At 48 hours, Panavia had statistically higher bond strength (P=.004) than Unicem (13.9 +/- 4.4MPa and 10.2 +/- 6.6MPa, respectively). However, both luting systems presented decreasing, statistically similar; values after aging (Panavia: 3.6 +/- 2.2MPa; Unicem: 6.1 +/- 5.3MPa). At 48 hours, Alloy Primer/Unicem had the lowest incidence of type 1 failure (8%). After aging, all the groups showed a predominance of type 1 failures. Conclusions. The use of Alloy Primer improved bond strength between RelyX Unicem and zirconia. Though the initial values obtained with Panavia were significantly higher than RelyX Unicem, after aging, both luting agents presented statistically similar performances. (J Prosthet Dent 2011;105:296-303) (AU)

• Processo FAPESP: 06/60537-4 - Efeito da aplicacao de monomeros desenvolvidos para uniao a ligas metalicas sobre a resistencia a micro tracao entre zirconia e cimentos resinosos.
• Beneficiário: Roberto Ruggiero Braga
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 06/52603-7 - Efeito da aplicação de monômeros desenvolvidos para união e ligas metálicas sobre a resistência a microtração entre zircônia e cimentos resinosos
• Beneficiário: Grace Mendonça Dias de Souza
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado