8 - Fixed appliances Flashcards
1
Q
Define fixed appliances.
A
- fixed to teeth and cannot be removed by patient
- consist of brackets, bands, archwires and auxiliaries
- precision tooth movers
2
Q
What are the properties of fixed appliances?
A
- 3D control
- complex tooth movements
- less dependant on compliance
- require excellent OH
- risk of iatrogenic damage
- poor intrinsic anchorage
3
Q
What are fixed appliances used for?
A
- correction of mild/moderate skeletal skeletal discrepancies (by camouflage)
- alignment of teeth
- correction of rotations
- centreline correction
- OB/OJ reduction
- closure/opening of spaces
- vertical movements of teeth
4
Q
What are Andrew’s six keys?
A
- tight approximate contacts with no rotations
- class I incisors
- class I molars
- flat occlusal plane or slight curve of spee
- long axis of teeth have slight mesial inclination except molars
- crowns of canines to molars have lingual inclination
5
Q
What are the components of fixed appliances?
A
- bracket/tube
- band
- archwires
- modules
- auxiliaries
- anchorage components
- force generating components
6
Q
What are the components of a bracket?
A
- bracket slot
- tie wings
- bracket base with prescription incorporated
7
Q
What materials can brackets be made of?
A
- metal (SS, CoCr, Ti)
- polymers
- ceramic
8
Q
What does the blue dot indicate on a bracket?
A
- positioning
- should be gingival an distal to achieve correct prescription
9
Q
What are molar bands for?
A
Increased anchorage
10
Q
What is tip?
A
- mesial/distal angulation of tooth
- determined by the angulation of slot on bracket
11
Q
What is torque?
A
- buccal/lingual angulation of tooth
- determined by angulation of bracket base
12
Q
How are brackets bonded to teeth?
A
Composite via acid etch
13
Q
How are molar bands bonded to teeth?
A
Glass ionomer
14
Q
What are the common materials used in archwires?
A
- stainless steel
- nicket titanium
15
Q
What are stainless steel archwires primarily used for?
A
Moving teeth
