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WorksheetsCasting procedure
Total questions: 10
Worksheet time: 3mins
Function of a 'Ring liner'
To create channel for elimination of wax during burnout
Allows mold expansion(cushion effect)
Reservoir of molten metal compensating for alloy shrinkage
None of the above
Sprue direction should ideally be
45° to proximal area
90° to proximal area
45° to occlusal area
90° to occlusal area
Setting expansion of casting investment:
0.8 - 1%
0.1 - 0.5%
1 - 2%
2 - 4%
Which part of the flame is used for fusion of casting alloy
Mixing zone
Communion zone
Reducing zone
Oxidizing zone
Which of the following are used for removing the sprue from casting
Joe Dandy discs
Moore discs
Meatless stone
Busch silent stone
Sprue length with respect to end of the ring
Within 5mm
More than 5mm
Within 6mm
More than 6mm
Ideally, a casting should fit with in:
20microns
10microns
50microns
25 - 40microns
Temperature for burnout in hygroscopic and thermal expansion technique are
600C and 800C
500C and 700C
700C and 400C
400C and 600C
Solution used for 'Pickling'
60% HCL
50% HCL
40% HCL
70% HCL
Which of the ring liner has 'Cariogenic potential'
Asbestos
Fibrous ceramic aluminous silicate
Cellulose
Ceramic-cellulose combination
