Frame work design & metal selection

Question 1

……… Is combine the strength and accuracy of casting metal with esthetic of
porcelain.

Answer 1

Metal ceramic restoration

Question 2

The metal coping in metal ceramic restoration is covered with layers of porcelain ….

Answer 2

1-Opaque
2-Dentin (body)
3-Incisal (enamel)

Question 3

……… is the metal framework to which the porcelain is bounded to it shaped to withstand the occlusal forces and to permit the space for porcelain.

Answer 3

The substructure (coping)

Question 4

Thickness of metal in noble metal alloy

Answer 4

(0.3-0.5)

Question 5

Thickness of metal in base metal alloy minimal

Answer 5

(0.2)

Question 6

……. it is the area or part of the metal ceramic restoration to which porcelain is fused.

Answer 6

Inter face

Question 7

In this method the die is dip into the molten wax to obtaining an even thickness and then the excess of wax is trimmed .

Answer 7

Dipping technique

Question 8

In this method A green sheet wax of 0.5mm in thickness is use to cover the die by adaptation and remove the excess, then the gingival collar is waxed by inlay wax.

Answer 8

Adapted technique (sheet wax or plastic)

Question 9

In this method A properly designed framework for a metal ceramic restoration can be achieved only by waxing the restoration to complete anatomic contour first and then cutting back a consistent amount for the veneer.

Answer 9

Waxing to anatomic contour (cutting back technique)

Question 10

Bonding Mechanisms (between metal and porcelain) is ……

Answer 10

1-Mechanical entrapment
2-Compressive force
3-Vander waals forces
4-Chemical bonding

Question 11

lingual gingival collar and full porcelain coverage because this design give an excellent appearance and lingual collar give strength crown.

Answer 11

In anterior teeth when the occlusion is normal

Question 12

Lingual collar over the lingual surface until 1.5 mm away from centric contact in order to get an occlusion in which the opposing teeth are occlude metal surface

Answer 12

In anterior teeth When heavy lingual conclusion

Question 13

The inter face finished at the incisal edge or in extreme 1mm above porcelain level, this lead to lose of the translucency of porcelain.

Answer 13

In anterior teeth When heavy incisal occlusion (edge to edge occlusion)

Question 14

The inter face normally finished at the contact area to allow for connector, no metal should be visible when the crown viewed from the labial surface.

Answer 14

In anterior teeth Proximal area in anterior teeth

Question 15

Full porcelain coverage with lingual gingival collar.

Answer 15

In posterior teeth In normal occlusion

Question 16

A metal plate forms are incorporated on the occlusal surface with heavy
occlusal spot only.

Answer 16

In posterior teeth When there is isolate heavy occlusion spots

Question 17

A metal occlusal surface is normally used when minimal tooth tissue is removed from occlusal surface is reqired.

Answer 17

In posterior teeth When heavy occlusion

Question 18

The inter face normally finished in contact area to allow for connector
no metal visible when the crown viewed from the labial surface.

Answer 18

In posterior teeth Proximal area