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Four variables that could possibly affect the bond strength of the porcelain to nonprecious alloy were investigated. The variables were directional variations of metal preparation using the Paasché Air Eraser with aluminum oxide fast-cut abrasive, atmosphere variations in the furnace from low to high temperature limits of the degassing cycle, time… (More)
All the vented samples with sprue widths of 2 mm or more were defect free, whereas the corresponding unvented samples had extensive voids and porosity in all but one casting. All castings with a sprue width of 1 mm were defective regardless of whether or not vents were used. The thickness of the investment above the pattern had no effect on casting results.