Effect of metal primers on bond strength of resin cements to base metals

• Published in: The Journal of prosthetic dentistry 2009-04, Vol.101 (4), p.262-268
• Main Authors: Fonseca, Renata Garcia, DDS, MSc, PhD, de Almeida, Juliana Gomes dos Santos Paes, DDS, MSc, Haneda, Isabella Gagliardi, DDS, MSc, Adabo, Gelson Luis, DDS, MSc, PhD
• Format: Article
• Language: English
• Subjects: Analysis of Variance; Chromium Alloys - chemistry; Crowns; Dental Alloys - chemistry; Dental Bonding - methods; Dental Stress Analysis; Dentistry; Materials Testing; Methacrylates - chemistry; Resin Cements - chemistry; Shear Strength; Statistics, Nonparametric; Thiones - chemistry; Titanium - chemistry
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/S0022-3913(09)60050-0

Statement of problem A strong and durable bond between a metal framework and a resin-based luting agent is desired. Metal primers have been shown to be very effective on noble alloys. However, there is insufficient information about their effect on base metals. Purpose The purpose of this study was to evaluate the effect of metal primers on the shear bond strength of resin cements to base metals. Material and methods A total of 160 cast commercially pure titanium (CP Ti) and NiCr alloy (VeraBond II) disks were embedded in a polyvinyl chloride ring, and their surfaces were smoothed with silicon carbide papers (320, 400, and 600 grit) and airborne-particle abraded with 50-μm aluminum oxide. Specimens of each metal were divided into 4 groups (n=20), which received one of the following luting techniques: (1) Panavia F, (2) Alloy Primer plus Panavia F, (3) Bistite II DC, or (4) Metaltite plus Bistite II DC. Forty minutes after preparation, all specimens were stored in distilled water at 37°C for 24 hours and then thermal cycled (1000 cycles, 5-55°C). After thermal cycling, the specimens were stored in 37°C distilled water for an additional 24 hours or 6 months before being tested in shear mode. Data (MPa) were analyzed using 3-way ANOVA and the post hoc Tukey test (α=.05). Each specimen was examined under an optical microscope (x30), and the failure mode was classified as adhesive, cohesive, or a combination of these. Results The only significant difference between the Panavia F and Alloy Primer plus Panavia F groups occurred in the NiCr alloy at 24 hours, at which point Panavia F demonstrated superior bond strength compared to Alloy Primer plus Panavia F ( P