Cast-metal full veneer crown

Question 1

Indications of full metal crown

Answer 1

1-Extensive destruction of tooth structure from caries, trauma
2-Endodontically treated teeth
3-Needs of maximum retention and strength
4-Need for recontouring of clinical crown (e .g to receive an RPD)
5-Correction of occlusal plane

Question 2

Advantages of full metal crown

Answer 2

1-High retentive qualities
2-Adequate resistance
3-More conservative in compare to PFM
4-Acomplet cast crown has superior strength

Question 3

In adequate axial reduction can cause

Answer 3

A-thin wall and weak restoration
B-over-contour restoration which encourage
Plaque accumulation.

Question 4

Metal-ceramic crown preparation
Indications

Answer 4

1-Extensive destruction of tooth structure from caries, trauma and
tooth wear
2-Endodontically treated teeth
3-Necessity for maximum retention and strength
4-Need for re-contouring of clinical crown
5-correction of occlusal plane

Question 5

Metal-ceramic crown preparation Contraindications

Answer 5

1-If more conservative restoration is feasible
2-Young patient with large pulp chamber

Question 6

What determines the design of the occlusal surface

Answer 6

1-esthetics
2-clinical crown height
3-occlusion
4-habits
5-opposing dentation
6-size of the pulp( age of the patient)

Question 7

All-ceramic crown preparation
Indications

Answer 7

1-In areas with high esthetic requirement
2-Incisal edge intact
3-Favorable distribution of occlusal load
4-Endodontically treated anterior teeth

Question 8

All-ceramic crown preparation
Contraindication

Answer 8

1-When superior strength is needed
2-Insufficient coronal tooth structure for support
3-Thin teeth faciolingually
4-Unfavourable distribution of occlusal load
a-edge to edge occlusion
b-bruxism

Question 9

methods of porcelain construction

Answer 9

1-Castable ceramic
a-(Dicor) : This material is cast as glass by lost wax technique
b-Heat pressed casting (IPS Empress)

2-Machinable ceramic CAD-CAM system

3-Core strengthening ceramics e.g. Hi- ceram- In-ceram

4-Bonded foil ceramic

Question 10

types of partial veneer crown :

Answer 10

1-Extracoronal restoration which include:
-3/4 crown of anterior and posterior teeth
-Reverse 3/4 crown
-7/8 crown
-Proximal half crown
2-Intracoronal restoration include:
Inlay, and Onlay
3-Laminate veneer