Evaluation and comparison of shear bond strength of porcelain to a beryllium-free alloy of nickel-chromium, nickel and beryllium free alloy of cobalt-chromium, and titanium: An in vitro study

Abstract

Aims:The aim of this study was to evaluate and compare the shear bond strength of porcelain to the alloys of nickel-chromium (Ni-Cr), cobalt-chromium (Co-Cr), and titanium.Materials and Methods:A total of 40 samples (25 mm × 3 mm × 0.5 mm) were fabricated using smooth casting wax and cast using Ni-Cr, Co-Cr, and titanium alloys followed by porcelain buildup. The samples were divided into four groups with each group containing 10 samples (Group A1–10: sandblasted Ni-Cr alloy, Group B1–10: sandblasted Co-Cr alloy, Group C1–10: nonsandblasted titanium alloy, and Group D1–10: sandblasted titanium alloy). Shear bond strength was measured using a Universal Testing Machine.Statistical Analysis Used:ANOVA test and Tukey's honestly significance difference post hoc test for multiple comparisons.Results:The mean shear bond strength values for these groups were 22.8960, 27.4400, 13.2560, and 25.3440 MPa, respectively, with sandblasted Co-Cr alloy having the highest and nonsandblasted titanium alloy having the lowest value.Conclusion:It could be concluded that newer nickel and beryllium free Co-Cr alloys and titanium alloys with improved strength to weight ratio could prove to be good alternatives to the conventional nickel-based alloys when biocompatibility was a concern.

Effect of Material Selection and Different Fabrication Techniques on Marginal and Internal Fit of Metal Ceramic and All Ceramic Crowns (In vivo and In vitro study)

“…So that, a substructure material without nickel and with better biocompatibility is desirable as alternative. Cobalt-chromium ceramic restorations are such alternative (19) .…”

“…Co-Cr alloys are progressively used because of their low cost compared to noble alloys. It has high strength, heat resistance, excellent biocompatibility as well as demonstrated favorable resistance to tarnish and corrosion in vivo due to the formation of passive surface film (19) .…”

Comparative Evaluation of Shear Bond Strength between Porcelain and Commercially Available Cobalt Chromium Alloys – An In-Vitro Study

“…The absence of nickel in the composition of these Co-Cr alloys, made them to be the choice of material for the fabrication of crowns and bridges for patients sensitive to nickel and hence Co-Cr alloys are replacing Ni-Cr alloys due to the nature of being more biocompatible and also due to the decreased rate of metal ion release. 4 In light of the above, the aim of the present study was to compare the shear bond strength of porcelain to three commercially available Co-Cr alloys. The objectives of the study was, to determine the shear bond strength of ceramic (Vita V60 i-Line) with three different commercially available Co-Cr alloys (Castco, Wironit, Girobond NBS).…”

A Comparative Assessment of Flexural Bond Strength of Ni–Cr Metal–Ceramic Alloy on Repeated Castings

“…11 The metallic elements that make up dental alloys can be divided into two major groups, the noble metals, and the base metals. 12 Nickel-based and cobalt-based are the two main categories of base-metal metal-ceramic alloy systems that exist. Base metal alloys are considered for their excellent physical properties as they exhibit the highest modulus of any alloy type used for cast restorations.…”