Effect of a metal primer on the bond strength of the resin-metal interface

• Published in: Journal of applied oral science Vol. 12; no. 2; pp. 113 - 116
• Main Authors: Freitas, Anderson Pinheiro de, Francisconi, Paulo Afonso Silveira
• Format: Journal Article
• Language: English
• Published: Brazil Faculdade De Odontologia De Bauru - USP 01-06-2004
• Subjects: DENTISTRY, ORAL SURGERY & MEDICINE; Resin cement; Resistência ao cisalhamento; Tratamento superficial; Cimento resinoso; Metallic alloy; Liga metálica; Surface treatment; Shear bond strength
• ISSN: 1678-7757; 1678-7765; 1678-7757
• DOI: 10.1590/s1678-77572004000200006

To evaluate the effect of different surface treatments on shear bond strength between a metallic alloy (Co-Cr-Mo - Remanium CD) and a resin cement (Rely X TM) and to evaluate the mode of fracture after testing, forty couples of metallic-alloy disks were melted, regularized, polished, submitted to four thermal cycles (Vacuum, 960ºC, 8 minutes) and randomly separated into four groups. Each group received a different type of treatment: Group PSP: Polished with sandpaper 600; Group PCP: Polished with sandpaper 600 and application of the metal primer Alloy Primer (Kuraray); Group JSP: Sandblasted with 100µm aluminum oxide; Group JCP: Sandblasted with 100mm aluminum oxide and treated with a metal Primer. The groups were cemented and stored in distilled water at 37ºC for 36 hours and submitted to the shear bond strength test. The mean and standard deviation (in Kgf/cm²) obtained for each group was: PSP 4.0/0.4; PCP 88.9/33.6; JSP 163.2/27.6; JCP 144.5/54.0. After the statistical analysis the authors concluded that: the highest values were obtained for the sandblasted groups (JSP, JCP), regardless of the primer application; the Alloy Primer increased the retention between the Rely X cement and the polished surface of the Co-Cr-Mo alloy, yet its bond strength was not greater than that obtained with sandblasting; all specimens showed adhesive failures in the tested interface.