Evaluation of flexural bond strength of porcelain to used nickel-chromium alloy in various percentages.
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Date
2012-01
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Abstract
Aim: The aim of this in vitro study was to evaluate the flexural bond strength of porcelain to combinations of used and new nickel-chromium alloy in various proportions.
Materials and Methods: Used and new nickel-chromium bonding alloys were combined in various proportions (groups I to V; 10 samples per group) and their flexural bond strengths with porcelain were compared. A three-point loading system was used for the application of load. Load was applied at a constant speed of 0.5 mm/minute and the load required to fracture the porcelain was recorded for each specimen.
Statistical Analysis Used: (a) Analysis of variance (ANOVA) and (b) Duncan's multiple range tests.
Results: The best bond strength values were seen when 100% new alloy was used. According to the findings of this study, there was no adverse effects noted with up to 75% recast metal, but serious changes were found in the bond strength values when 100% old metal was used.
Conclusions: The following conclusions were drawn from the study
Fresh nickel-chromium alloy shows the greatest porcelain adherence.
There is no significant change in bond strength of ceramic to alloy with up to 75% of used nickel-chromium alloy.
At least 25%- of new alloy should be added when recycled nickel-chromium alloy is being used for metal ceramic restorations.
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Keywords
Flexural bond strengths, nickel-chromium alloy, porcelain metal bond strength, recasting, reusing
Citation
Madhav V N V, Padmanabhan T V, Subramnian R. Evaluation of flexural bond strength of porcelain to used nickel-chromium alloy in various percentages. Indian Journal of Dental Research. 2012 Jan-Feb; 23(1): 11-14.