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Casting made simple using modified sprue design: An in vitro study
- Source :
- Indian Journal of Dental Research, Vol 25, Iss 3, Pp 340-345 (2014)
- Publication Year :
- 2014
- Publisher :
- Medknow, 2014.
-
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.
- Subjects :
- porosity
Materials science
Dentistry
In Vitro Techniques
Cobalt-chromium alloy
Indentation hardness
Dental Casting Technique
Composite material
Porosity
General Dentistry
Acrylic resin
business.industry
General Medicine
Hardness
lcsh:RK1-715
three-dimensional printed resin pattern
Dental Casting Investment
marginal gap
Casting (metalworking)
lcsh:Dentistry
visual_art
modified sprue
microhardness
visual_art.visual_art_medium
business
Castability
Subjects
Details
- ISSN :
- 09709290
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Indian Journal of Dental Research
- Accession number :
- edsair.doi.dedup.....7f1c7caacbf6243338a5d5d3e7393d4b
- Full Text :
- https://doi.org/10.4103/0970-9290.138333