Ideal dental material Flashcards
1
Q
Ideal dental material
A
- biocompatible
- should have a permanent bond with tooth structure or bone
- should match the natural appearance of tooth structure
- exhibit similar properties of tooth structure
2
Q
Define the “ interatomic bond “
A
- it is the cohesive force that hold atoms together
- interatomic bonds are divided into primary and secondary
3
Q
List the primary and secondary interatomic bonds
A
- primary interatomic bond
- ionic bond
- covalent bond
- metallic bond
- secondary interatomic bond
- hydrogen bond
- van der waals forces
4
Q
Define the “ adhesion “
A
It is the attraction contact between different molecules
5
Q
Define the “ cohesion “
A
It is the attraction / intimate contact between similar molecules
6
Q
Define the “ adhesive “
A
It is the used material to cause adhesion
7
Q
Define the “ adherand “
A
It is the material which adhesive is applied on
8
Q
Surface energy
A
- It is the attraction force between the surface atoms of a solid
⬆️ surface energy ⬆️ wetting
9
Q
Surface tension
A
- It is the attraction force between the surface atoms of a liquid
⬆️ surface tension ⬇️ wetting
10
Q
Macro-mechanical bonding
A
- occurs by performing undercut inside the tooth structure
e. x amalgam restoration
11
Q
Micro-mechanical bonding
A
- occurs as a liquid flows into pores of solid surface, then the liquid is hardened .
e. x resin composite restoration
12
Q
Wetting
A
- It is the ability of the liquid to spread over a solid surface
13
Q
Contact angle
A
- The wetting is measured by contact angle
⬇️ smaller contact angle ⬆️ wetting
14
Q
Ideal biological properties of dental cement
A
- not toxic
- not irritant
- bacteriostatic
- thermal insulation
- electrical insulation
- chemical insulation
15
Q
Ideal solubility of dental cement
A
- should be insoluble to prevent “ leakage and loosening “
