scholarly journals Evaluation of the Effect of recasting Nickel–chromium Base Metal Alloy on the Metal–ceramic Bond Strength: An in vitro Study

2017 ◽  
Vol 18 (9) ◽  
pp. 837-841
Author(s):  
T Meenakshi ◽  
Munagapati Bharathi ◽  
Jayasree Komala
Keyword(s):  
Bond Strength ◽  
Base Metal ◽  
Metal Alloy ◽  
Bending Test ◽  
Chromium Alloy ◽  
Nickel Chromium ◽  
Ceramic Bond ◽  
Metal Ceramic ◽  
Base Metal Alloy

ABSTRACT Aim The aim of this study was to evaluate the effect of recasting base metal alloy on the metal–ceramic bond strength. Materials and methods A total of 60 test samples were prepared from new and recast nickel–chromium alloy and divided into six groups. In group A0, test samples were prepared from 100% new alloy. Groups A1, A2, A3, A4, and A5 were prepared from 50% new alloy and 50% casting remnants (sprue and buttons) of the previous group by weight. All these samples were coated with ceramic (IPS d.SIGN and Ivoclar-Vivadent), and samples were then subjected to three-point bending test to evaluate metal–ceramic bond strength. Results The values were analyzed using one-way analysis of variance and Tukey's post hoc test. The mean bond strength of group A0 was higher than that of groups A1, A2, A3, A4, and A5. Conclusion Metal–ceramic bond strength decreased significantly with multiple recastings. Clinical significance Bond strength between metal and ceramic is a crucial factor for the clinical performance of metal–ceramic restorations. Recasting of alloys may affect the metal oxide layer composition and thickness of metal–ceramic interface, and thereby the metal–ceramic bond. How to cite this article Meenakshi T, Bharathi M, Komala J. Evaluation of the Effect of recasting Nickel–chromium Base Metal Alloy on the Metal–ceramic Bond Strength: An in vitro Study. J Contemp Dent Pract 2017;18(9):837-841.

scholarly journals Mechanical properties of metal-ceramic systems from nickel-chromium and cobalt-chromium alloys

2007 ◽  
Vol 64 (4) ◽  
pp. 241-245 ◽  
Author(s):  
Nemanja Mirkovic
Keyword(s):  
Elastic Modulus ◽  
Bond Strength ◽  
Testing Machine ◽  
Bending Test ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Ceramic Bond ◽  
Metal Ceramic

Background/Aim. Metal-ceramic bond strength and alloys' elastic modulus clearly determine the potential of alloy application, because the ceramic integrity during mastication depends on these two characteristics. The aim of this study was to evaluate metal-ceramic bond strength and elastic modulus of cobalt-chromium alloys in making porcelainfused- to-metal restorations, regarding the application of the most frequent nickel-chromium alloy. Methods. The research was performed as an experimental study. Six metalceramic samples were made from nickel-chromium alloy (Wiron 99) and cobalt-chromium alloy (Wirobond C), according to the manufactures manuals and instructions from ISO 9693: 1996. Three-point bending test was performed up to the ceramic fracture. The fracture load was measured on an universal testing machine (Zwick, type 1464), with cross-head speed of 0,05mm/min. Results. The results of this study confirmed the significant differences between the metal-ceramic bond strength (p < 0.01) and elastic modulus (p < 0.001) of nickel-chromium and cobalt-chromium alloys, where cobalt-chromium alloys showed higher values for both tested parameters. Conclusion. Cobalt-chromium metal-ceramic alloys can successfully replace nickel-chromium alloys, especially for fabrication of long-span metal-ceramic bridges due to the great flexural strength.

Metal Ceramic Bond After Multiple Castings of Base Metal Alloy

2009 ◽  
Vol 102 (3) ◽  
pp. 165-171 ◽  
Author(s):  
Yurdanur Ucar ◽  
Zafer Aksahin ◽  
Cem Kurtoglu
Keyword(s):  
Base Metal ◽  
Metal Alloy ◽  
Ceramic Bond ◽  
Metal Ceramic ◽  
Base Metal Alloy

scholarly journals Effect of recasting on the elastic modulus of metal-ceramic systems from nickel-chromium and cobalt-chromium alloys

2007 ◽  
Vol 64 (7) ◽  
pp. 469-473 ◽  
Author(s):  
Nemanja Mirkovic
Keyword(s):  
Elastic Modulus ◽  
Testing Machine ◽  
Fracture Load ◽  
Bending Test ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Nickel Chromium ◽  
Ceramic Samples ◽  
Chromium Alloys ◽  
Metal Ceramic

Background/Aim. Elastic modulus of metal-ceramic systems determines their flexural strength and prevents damages on ceramics during mastication. Recycling of basic alloys is often a clinical practice, despite the possible effects on the quality of the future metal-ceramic dentures. This research was done to establish recasting effects of nickel-chromium and cobalt-chromium alloys on the elastic modulus of metalceramic systems in making fixed partial dentures. Methods. The research was performed as an experimental study. Six metal-ceramic samples of nickel-chromium alloy (Wiron 99) and cobalt-chromium alloy (Wirobond C) were made. Alloy residues were recycled through twelve casting generations with the addition of 50% of new alloy on the occasion of every recasting. Three- point bending test was used to determine elastic modulus, recommended by the standard ISO 9693:1999. Fracture load for damaging ceramic layer was recorded on the universal testing machine (Zwick, type 1464), with the speed of 0,05 mm/min. Results. The results of this research revealed significant differences between elasticity modules of metal-ceramic samples in every examined recycle generation. Recasting had negative effect on the elastic modulus of the examined alloys. This research showed the slight linear reduction of elastic modulus up to the 6th generation of recycling. After the 6th recycling there was a sudden fall of elastic modulus. Conclusion. Recasting of nickelchromium and cobalt-chromium alloys is not recommended because of the reduced elastic modulus of these alloys. Instead of reusing previously recasted alloys, the alloy residues should be returned to the manufacturer. .

Fit of titanium and a base metal alloy metal-ceramic crown

2000 ◽  
Vol 83 (3) ◽  
pp. 314-318 ◽  
Author(s):  
Selçuk Oruç ◽  
Ýbrahim Tulunoglu
Keyword(s):  
Base Metal ◽  
Metal Alloy ◽  
Metal Ceramic ◽  
Ceramic Crown ◽  
Alloy Metal ◽  
Base Metal Alloy

Shear bond strength of self-adhesive resin cements to base metal alloy

2014 ◽  
Vol 111 (5) ◽  
pp. 411-415 ◽  
Author(s):  
Susan Hattar ◽  
Muhanad Hatamleh ◽  
Ameen Khraisat ◽  
Mohammad Al-Rabab'ah
Keyword(s):  
Bond Strength ◽  
Base Metal ◽  
Shear Bond Strength ◽  
Metal Alloy ◽  
Resin Cements ◽  
Adhesive Resin ◽  
Base Metal Alloy

scholarly journals Sprue design alterations and its effect on the properties of base metal alloy castings: An in vitro study

2015 ◽  
Vol 7 (6) ◽  
pp. 524
Author(s):  
KR Geetha Prabhu ◽  
R Prabhu ◽  
H Maheswari ◽  
MA Eswaran ◽  
G Phanikrishna ◽  
...  
Keyword(s):  
Base Metal ◽  
In Vitro Study ◽  
Metal Alloy ◽  
Vitro Study ◽  
Alloy Castings ◽  
Base Metal Alloy

Leaching of nickel, chromium, and beryllium ions from base metal alloy in an artificial oral environment

1992 ◽  
Vol 68 (4) ◽  
pp. 692-697 ◽  
Author(s):  
Yong Tai ◽  
Ralph De Long ◽  
Richard J. Goodkind ◽  
William H. Douglas
Keyword(s):  
Base Metal ◽  
Metal Alloy ◽  
Nickel Chromium ◽  
Oral Environment ◽  
Base Metal Alloy

Reducing the alloy thickness of base metal ceramic restorations

2009 ◽  
Vol 1 (2) ◽  
pp. 25-29
Author(s):  
Andre Rayne Le Roux
Keyword(s):  
South Africa ◽  
Base Metal ◽  
Noble Metal ◽  
Metal Alloy ◽  
Metal Alloys ◽  
Modulus Of Rupture ◽  
Metal Ceramic ◽  
Ceramic Restorations ◽  
Noble Metal Alloys ◽  
Base Metal Alloy

Reduction in base metal alloy thickness will permit additional porcelain depth and improved aesthetics but unfortunately little information exists regarding the thickness to which base metal alloys may be reduced in comparison to noble metal alloys for metal ceramic restorations. Even with comparison of noble metal alloys the aesthetic benefits are restricted to improving aesthetics in base metal restoration further, since noble metal alloys are generally regarded as providing superior aesthetics to base metal restorative alloys. Purpose: The objective of this study was to determine whether a significant reduction in thickness could be achieved using a base metal alloy as compared to a noble metal alloy and the thickness to which base metal alloy substructures could safely be reduced while still providing the same resistance to fracture of the porcelain. Material and methods: Tensile strength tests (N) of the modulus of rupture of the porcelain were performed on 40 base metal alloy (Wiron 99, Bego, Germany) and 12 noble metal alloy rectangular specimens (5.8 mm wide and 15.0 mm long) bonded to a standardized 1.0 mm thickness of dentine Creation porcelain. The base metal alloy thickness varied in 0.1mm increments from 0.1 to 0.4 mm. The results were compared to 12 noble metal alloy (Bio Y 81, Argen, South Africa) specimens of recommended minimum thickness (0.3 mm). Data for the results was obtained using a universal tensile testing instrument, which was set to operate at a cross head speed of 0.5mm (Instron Mini 44, Instron corporation U.S.A). The applied force (N) that measured the modulus of rupture of each specimen was printed from a computer connected to the Instron Mini 44 that operated on a 95% level of confidence. Instron Agents (Durban, South Africa) performed the calibration and setting up of the machine prior to testing the specimens. Results: The results indicated a permissible 33.33% reduction in the base metal alloy specimens as compared to the noble metal alloy control specimens. This was deduced from the reduction in alloy thickness of up to 0.2 mm for base metal alloy specimens as compared to the 0.3 mm noble metal alloy specimens. The recommended thickness to which the base metal alloys could be reduced without distortion of the alloy was also 0.2 mm. The one-way ANOVA showed a level of significance of (α=05).

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