Wight T A, Grisius R J, Gaugler R W
J Prosthet Dent. 1980 Apr;43(4):415-8. doi: 10.1016/0022-3913(80)90212-7.
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.
所有浇口宽度为2毫米或更宽的排气样品均无缺陷，而相应的未排气样品除了一个铸件外，在所有铸件中都有大量气孔和孔隙。所有浇口宽度为1毫米的铸件无论是否使用排气孔都有缺陷。铸型上方熔模材料的厚度对铸造结果没有影响。
