some description mainly about brittleness & how it can be overcome in dentistry by new techniques as veneer I hope enjoying my topic

2. By:

3. Why glass break ?

4. Glass is
brittle material
What is brittle material
mean ?

5.  Brittleness :
Tendency of a material to fracture or fail
upon the application of a relatively small
amount of force , impact or shock .
SIMILARLY,
a variety of brittle restorative material , including dental
amalgam ,cements , ceramic material , plaster and stone .

7. • Note:
In many instances the material is much weaker
in tension than in compression which may
contribute to failure of the material in service .
So,
Brittle material must be
gripped with caution ,and
any stress concentrations
at the grips can lead to
premature fracture .

9. An alternative method of testing brittle material ,
in which the ultimate tensile strength of a brittle
material is determined through compressive
testing .
The method is described as the diametral
compression test for tension , Brazilian test
Or indirect tensile .

11. Stress-strain curve :
Tensile strength :

13. Although ,
This material are weak but have some
special properties that is not found in
other material .
Dental ceramics ,
Are characterized by their refractory nature
High hardness and chemical inertness .

14. But,
With eating Hard material

15. Actually,

16. So ,
What we can do to get more
nature appearance as soon as
great resistance to fracture ??

18. The most advanced research in
dentistry shown in micro-
structure
Of veneer proved that:
Its compliance with teeth

19. Not surprising to see
many of discoveries and
developments in this area
(‫قليال‬ ‫اال‬ ‫العلم‬ ‫من‬ ‫اوتيتم‬ ‫وما‬.......)