fixed appliances ortho 1 Flashcards
1
Q
types of tooth movement
A
tipping - mainly just crown movement bodily - crown and root extrusion/intrusion torque - movement of root of tooth rotation
2
Q
problems with fixed applaicnes
A
enamel demineralisation/caries root resorption soft tissue lacerations periodontal probelms unwanted tooth movements pulp devitlasation
3
Q
fixed appliance components
A
brackets
molar tubes/bands
archwires
auxiliaries
4
Q
components of brackts
A
tie wings
slots
5
Q
rectangular arch wire
A
3D control
19x25 arch wite
used for final alignment and space closure
6
Q
plastic brackets disadvantage (historic)
A
prone to fracture
discoluration
distortion
7
Q
ceramic brackest
A
aesthetics can fracture during use and debonding abrasion of other teeth if touching opposing arch cost friction
8
Q
how do molar tubes bond to the tooth
A
direct bond
no need for separators
9
Q
archwire functions
A
active archwires
passive archwires
10
Q
active archwites
A
- engage onto bracket
- move teeth with wire
- light forces
- flexible
- generally use nickel titanium, can have round and rectangular
11
Q
passive archwires
A
- move teeth along with wire (teeth themselves move along the wire)
- rigid
- stainless steel, once teeth aligned can be used for bodily movement of teeth
12
Q
materials of archwires and ad/dis
A
nickel titanium (used for alignment, shape memory, elastic, heat activated) SS (rigid, can maintain arch form)
13
Q
cross section of witres
A
round 0.012-0.018
rectangular 0.018/9-0.025
14
Q
elastic modules
A
hold arch wire in place
15
Q
auxiliaries
A
elastic
springs
