Spruing

Question 1

…………. Is a process of connecting the wax pattern with the crucible former in the casting ring with a pin made of wax, plastic or metal

Answer 1

Spruing

Question 2

……… It’s a channel through which the molten alloy can reach the mold in an invested ring after the wax has been eliminated.

Answer 2

Sprue

Question 3

Sprue design varies depending on……….

Answer 3

1.type of restoration being cast.
2. alloy used.
3. casting machine.

Question 4

Types of sprue According to material used is ….

Answer 4

1-Wax sprue former : (for large restorations E,g..RPD) 2-Plastic /Resin sprue former : (for smaller restorations) 3-Metal sprue : (for smaller restorations E,g..Crown ).

Question 5

Requirements of the sprue is …..

Answer 5

1. must allow the molten wax
2. must allow the molten metal to flow into the mold cavity
3. must remain molten slightly longer than the alloy

Question 6

……Is a small amount of additional wax added to sprue former 1mm below wax pattern.

Answer 6

Reservoir

Question 7

Reservoir Function is …..

Answer 7

compensate the shrinkage occurs during solidification of the casting.

Question 8

Types of Spruing is ….

Answer 8

1-Direct
2-Indirect

Question 9

……It uses the same basic principal of spruing it uses for Bridge. But the only difference lies يوجد in attachment of 3 running horizontal bars.

Answer 9

Indirect Spruing

Question 10

……….Sprue former provides direct connection between pattern area and the crucible formerit uses for Crown

Answer 10

Direct Spruing

Question 11

The whole indirect sprue complex consists of ….

Answer 11

1- Feeder sprue
2- Horizontal running bar
3- 6 or 8-gauge sprue former.

Question 12

the margin of the wax pattern should be about …….. away from the end of the casting ring

Answer 12

6mm

Question 13

The Location or position of the attachment of the sprue with the wax pattern should be to the ……

Answer 13

bulkiest area of the wax pattern

Question 14

…………It is a cone-shape base made of rubber or metal, which forms the base of the casting ring, and to which the other end of the sprue is attached.

Answer 14

Crucible Former

Question 15

…………. is made of metal and is used to hold the investment material in place during its setting and to restrict its expansion

Answer 15

Casting Ring

Question 16

………. The liner is used to line the inside of the casting ring.
It is made from a compressible material.

Answer 16

Ring Liner

Question 17

…….. Small auxiliary sprue or vents have been recommended to improve casting of thin patterns and may help in gases escape during casting.

Answer 17

Venting

Question 18

Reservoir Is a small amount of additional wax added to sprue former …… below wax pattern

Answer 18

1mm