Ceramic

Question 1

Advantages.

Answer 1

Superior esthetic
2- Excellent translucency
3- Good tissue response
with subgingival margins.

slightly less tooth reduction
from the facial surface than with
metal-ceramic crown, although
the lingual surface needs
additional reduction for strength

Question 2

Disadv

Answer 2

1) Reduced strength
2) Brittle, therefore, more susceptible to fracture.

Significant tooth
reduction is necessary on
proximal and lingual aspects
(structural durability)

Difficulties may be associated
with obtaining a well fitting
margin.
5) Proper design is critical for
mechanical success.

6) Wear has been observed on the
functional surfaces of natural teeth
that oppose rough (unpolished )
ceramic restorations.
7) All-ceramic crown is not suitable
as FPD retainer

Overshortened preparation will create
stress concentrations in the labiogingival
area of crown (half-moon fracture)

Question 3

Indication

Answer 3

Indication
1-Areas with high esthetic requirement
2- Sufficient tooth structure to support
the restoration particularly incisal area
3-Favourable distribution of occlusal
load.

Fractured anterior teeth not involving more than1/3 of inciso-
gingival length.o

Discolored- Malformerd- Malposed
or Rotated teeth.

Question 4

Contraindication

Answer 4

When more conservative restoration
can be done.
2- It is not possible to provide adequate
support or an even shoulder width of at
least 1mm
o Teeth with short cervical crowns , they do
not have enough preparation
o Length to support the restoration
3- When superior strength is needed.

If occlusal load is unfavourable:
• Teeth with an edge-to-edge occlusion
• When the opposing teeth occlude on the cervical
fifth of the lingual surface tension will be
produced, and a half-moon fracture is likely to
occur

Patient with short clinical crown.
5- Younger patient with large vital
pulp.
6- Thin teeth facio-lingually or with
constricted cervical circumference