[Effect of recasting on the thickness of metal-ceramic interface of nickel-chromium and cobalt-chromium alloys].

Abstract:

INTRODUCTION/AIM:This research was done to establish recasting effects of nickel-chromium and cobalt-chromium alloys on the thickness of their metal-ceramic interface in making fixed partial dentures. Metal-ceramic interface determines their functional integrity and prevents damages on ceramics during mastication. Investigation of metal-ceramic samples is supposed to show if base metal alloys for metal-ceramics are successfully recycled without any risk of reduction of metal-ceramic interface thickness. METHODS:The research was performed as an experimental study. Per six metal-ceramic samples of nickel-chromium alloy (Wiron99) and cobalt-chromium alloy (Wirobond C) were made each. Alloy residues were recycled through twelve casting generations with the addition of 50% of new alloy on the occasion of every recasting. Analysis Energy Dispersive X-ray (EDX) (Oxford Instruments) and Scanning Electon Microscop (SEM) analysis (JEOL) were used to determine thickness of metal-ceramic interface together with PC Software for quantification of visual informations (KVI POPOVAC). RESULTS:Results of this research introduced significant differences between thickness of metal-ceramic interface in every examined recycle generation. Recasting had negative effect on thickness of metal-ceramic interface of the examined alloys. This research showed almost linear reduction of elastic modulus up to the 12th generation of recycling. CONCLUSION:Recasting of nickel-chromium and cobalt-chromium alloys is not recommended because of reduced thickness of metal-ceramic interface of these alloys. Instead of recycling, the alloy residues should be returned to the manufacturers.

journal_name

Vojnosanit Pregl

journal_title

Vojnosanitetski pregled

authors

doi

10.2298/vsp0805365m

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

365-9

issue

5

eissn

0042-8450

issn

2406-0720

journal_volume

65

pub_type

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