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Ortho > Fixed appliances > Flashcards

Fixed appliances Flashcards

1
Q

What are the components of a bracket?

A
  1. Bracket base
  2. Tie wing
  3. Archwire slot
  4. Bracket marker - to be placed distogingivally
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2
Q

What are the 3 tooth positioning variables controlled by the straight wire system?

A

First order - in//out or labio/lingual position
Second order - tooth angulation or mesio-distal tip
Third order - tooth angulation or torque

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3
Q

What bracket feature controls the first order?

A

The thickness of the bracket base

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4
Q

What bracket feature controls the second order?

A

The angulation of the archwire slot. Tooth tip is greatest for canines

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5
Q

What bracket feature controls the third order?

A

The angle the bracket base makes with the bracket slot, when viewed from the side

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6
Q

Where on the tooth should brackets be placed?

A

The centre of the bracket base should be positioned approximately over the midpoint of the long axis of the the clinical crown - known as the LA point

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7
Q

What is the definition of a fixed appliance?

A

An orthodontic appliance which is fixed to the teeth and can’t be removed by the patient

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8
Q

What are the mechanical principles of a fixed appliance?

A
  1. Applies mechanical force couple to the crown
  2. Allows precise control over the nature and direction of the forces applied
  3. Forces applied though interactions between components - archwires, auxialllaries, brackets
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9
Q

What kind of tooth movements occur with a FA?

A

Bodily
Rotation
Torque

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10
Q

What different materials can archwires be made from?

A

NiTi
Stainless steel
TMA (titanium molybdenum alloy)

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11
Q

Which different cross-sections do archwires have?

A

Round

Rectangular

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12
Q

What different materials can the brackets be made from?

A

Stainless steel
ceramic
plastic

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13
Q

What different types of brackets are there?

A

Twin

Self-ligating

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14
Q

What type of brackets are used in the BDH?

A

Twin stainless steel brakcets

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15
Q

Which type of archwire is needed to torque teeth?

A

Rectangular

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16
Q

Andrew’s 6 keys to normal occlusion (1972)

A
  1. Correct the molar relationship (to class 1)
  2. Correct the crown angulation
  3. Correct the crown inclination
  4. no rotations
  5. flat occlusal plane
  6. tight interproximal contacts - no space
17
Q

What are the different types of FA

A
  1. Pre-adjusted edgewise appliance

2. Self-ligating appliance - Damon

18
Q

What are the phases of fixed appliance treatment?

A
  1. Levelling and alignment
  2. Overbite reduction
  3. Overjet reduction
  4. Space closure
  5. Finishing procedures
19
Q

How can you reduce overjet and close space?

A
  1. Stainless steel wires

2. Interarch elastics

20
Q

When should you close space?

A

When the canines are in a class 1 occlusion

21
Q

Initial alignment should be carried out with which wire?

A

0.012” or 0.014” NiTi. Flexible and high elastic limit

22
Q

What is the choice of wire for overbite reduction?

A

Large diameter
Rigid
Stainless steel - round or rectangular

23
Q

Which wire would you use for overjet reduction?

A

Rigid archwire of large dimensions

SS 0.019” x 0,025”

24
Q

Which wire would you use for space closure?

A

Rigid archwire of large dimensions
SS 0.019” x 0,025”
Provides bodily control and prevents teeth tipping into space

25
Q

Which archwire would you chose for finishing procedures?

A

Small diameter, thin stainless steel archwires

26
Q

What two categories can you put problems with fixed appliances into?

A

Appliance related

Patient related

27
Q

What appliance related problems are there?

A

Gingival inflammation
decalcification
root resorption
soft tissue trauma

28
Q

What patient related problems are there?

A

Attendance
Breakages
Poor Oral hygiene

29
Q

What are the phases of fixed appliance treatment?

A
  1. Levelling and alignment
  2. Overbite reduction
  3. Overjet reduction
  4. Space closure
  5. Finishing procedures
30
Q

How can you reduce overjet and close space?

A
  1. Stainless steel wires

2. Interarch elastics

31
Q

When should you close space?

A

When the canines are in a class 1 occlusion

32
Q

Initial alignment should be carried out with which wire?

A

0.012” or 0.014” NiTi. Flexible and high elastic limit

33
Q

What is the choice of wire for overbite reduction?

A

Large diameter
Rigid
Stainless steel - round or rectangular

34
Q

Which wire would you use for overjet reduction?

A

Rigid archwire of large dimensions

SS 0.019” x 0,025”

35
Q

Which wire would you use for space closure?

A

Rigid archwire of large dimensions
SS 0.019” x 0,025”
Provides bodily control and prevents teeth tipping into space

36
Q

Which archwire would you chose for finishing procedures?

A

Small diameter, thin stainless steel archwires

37
Q

What two categories can you put problems with fixed appliances into?

A

Appliance related

Patient related

38
Q

What appliance related problems are there?

A

Gingival inflammation
decalcification
root resorption
soft tissue trauma

39
Q

What patient related problems are there?

A

Attendance
Breakages
Poor Oral hygiene

Ortho (4 decks)

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