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ORIGINAL RESEARCH Table of Contents   
Year : 2012  |  Volume : 23  |  Issue : 1  |  Page : 11-14
Evaluation of flexural bond strength of porcelain to used nickel-chromium alloy in various percentages


1 Department of Prosthodontics, Sinhgad Dental College and Hospital, Pune, Maharashtra, India
2 Department of Prosthodontics, Sri Ramachandra Dental College and Hospital, Chennai, India
3 Department of Prosthodontics, Noorul-Islam College of Dental Sciences, Kerala, India

Correspondence Address:
VNV Madhav
Department of Prosthodontics, Sinhgad Dental College and Hospital, Pune, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.99030

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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
  1. Fresh nickel-chromium alloy shows the greatest porcelain adherence.
  2. There is no significant change in bond strength of ceramic to alloy with up to 75% of used nickel-chromium alloy.
  3. 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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