Casting made simple using modified sprue design: An in vitro study.
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Date
2014-05
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Abstract
Background: Success in dental casting restorations for fixed partial dentures (FPDs) depends
on the castability. Castability is described as the ability of an alloy to faithfully reproduce
sharp detail and fine margins of a wax pattern. The goal of a prosthodontist is to provide the
patient with restorations that fit precisely. Regardless of the alloy used for casting, the casting
technique should yield a casted alloy, which should possess sufficient mass, surface hardness
and minimal porosity after casting.
Materials and Methods: Twenty patterns for casting were made from three‑dimensional printed
resin pattern simulating a 3 unit FPD and casted using modified sprue technique. Later test
samples were cemented sequentially on stainless steel model using pressure indicating paste
and evaluated for vertical marginal gap in eight predetermined reference areas. Marginal
gap were measured in microns using Video Measuring System (VMS2010F‑CIP Corporation,
Korea). A portion of the axial wall of the cast abutments depicting premolar and molar
were sectioned and embedded in acrylic resin and tested for micro hardness using Reichert
Polyvar 2 Met Microhardness tester (Reichert, Austria) and porosity using Quantimet Image
Analyzer (Quantimet Corporation London, England).
Results: The results obtained for marginal gap, micro hardness, and porosity of all test samples
were tabulated, descriptive statistics were calculated and the values were found to be within
the clinically acceptable range.
Conclusion: The new sprue technique can be an alternative and convenient method for casting
which would minimize metal wasting and less time consuming. However, further studies with
same technique on various parameters are to be conducted for its broad acceptance.
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Keywords
Cobalt‑chromium alloy, marginal gap, microhardness, modified sprue, porosity, three‑dimensional printed resin pattern
Citation
Baskaran B Eswaran, Prabhu K R Geetha, Prabhu R, Krishna G Phani, Eswaran M A, Gajapathi B. Casting made simple using modified sprue design: An in vitro study. Indian Journal of Dental Research. 2014 May-Jun; 25(3): 340-345.