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- W3020532429 abstract "Abstract Background and Objectives: Marginal fit of cast restoration is a major factor in long term survival of restoration. The sprue design is one of the variables that affect successful castings. Porosity can occur both on the surface and sub-surface of the casting. Base metal alloys have been used as an alternative to traditional high gold content alloys due to their superior mechanical properties. The purpose of this study was to evaluate and compare the influence of various sprue designs on surface porosity and dimensional accuracy with conventional sprue design on five-unit singlepiece base metal alloy castings. Materials and Method: A metal die that stimulate a five unit Fixed partial denture was fabricated. Three different types of sprue designs was assigned to the pattern and casted. The marginal discrepancy was determined by measuring the space between the margin of the crown and the shoulder finish line of the abutment using Scanning electronic Microscope(100X magnification). Surface porosity was evaluated using stereomicroscope (X10 Magnification). Results: Best marginal fit based on the grand means and standard deviations was in the conventional design group followed by experimental 4mm and 3mmsprue design. Significant differences was present in the 3mm sprue when compared with 4mm sprue(<0.001) as well as the conventional design(<0.001). Interpretation and Conclusion: There was no surface porosity observed under stereomicroscope. When marginal discrepancy was compared with conventional design, 4mm single sprue was more effective than the 3mm single sprue." @default.
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- W3020532429 date "2016-12-01" @default.
- W3020532429 modified "2023-09-23" @default.
- W3020532429 title "Evaluation of the Influence of Various Sprue Designs on Surface Porosity and Dimensional Accuracy of Base Metal Alloy Castings - An In Vitro Study" @default.
- W3020532429 doi "https://doi.org/10.1055/s-0040-1708674" @default.
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