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Ortho Part A > Class 5 > Flashcards

Class 5 Flashcards

1
Q

Removable appliances advantages

A

Removable
More hygienic
May be more esthetic
Easier for certain growth modification treatment than fixed appliances

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2
Q

Removable appliances disadvantages

A

Relying on patient compliance
Less precise force control than fixed appliances
Involves lab work

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3
Q

Removable appliances primary use

A

Growth modification
Minor tooth movements
Retention

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4
Q

Bionator

A

Stimulate mandibular growth

Control tooth eruption

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5
Q

Twin block

A

Stimulate mandibular growth
Can include an expander
Can add headgears

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6
Q

Frankle Appliance

A

Completely tissue borne
Buccal shields or lip pads to reduce cheek and lip pressure for expansion
Stimulate mandibular growth

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7
Q

Reverse Pull headgear

A

For preadolescent exhibiting maxillary deficiency

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8
Q

Anterior bite plates

A

To decrease overbite

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9
Q

Posterior bite plates

A

To increase overbite

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10
Q

Spring Retainers

A

Used for both retention and minor tooth movement

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11
Q

Tooth Positioners

A

Used for minor tooth movement and retention

Is fabricated on set up models to which desired tooth movement has been included

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12
Q

Begg Appliance

A

Added axullary springs for root control

Contact is very small and friction is Minimal—> teeth can be moved quickly but hard for root control

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13
Q

1st order bends are needed to

A

Compensate for horizontal position variations

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14
Q

Pre-adjusted edgewise

A

Make the bracket base of upper lateral incisor lower in Soros thicker while the molar tube profile shorter than adjacent bracket slots

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15
Q

Mesial distal angulation

A

By varying bracket slot tipping the diffference for tooth long axis angulation are compensated for

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16
Q

2nd order bends

A

Needed to change mesial distal angulation

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17
Q

Third order

A

By varying the slot bracket angle or differential changing the bracket base thickness the differences of tooth labial lingual angulation are compensated for

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18
Q

Typical components of modern edgewise appliances

A

Bands with molar tubes
Brackets
Archwires
Auxiliaries -elasometic chains, coil springs, lingual arches, transpalatal bars, extra oral appliances, temporary anchorage devices

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19
Q

Open coil springs

A

For opening space retracting teeth

20
Q

Closed coil springs

A

Maintaining space

21
Q

Pendulum appliance

A

For molar distalization

Bonded to premolars

TMA wires with helixes inserted to molar tubes

Anchorage from palate

Primarily molar movemnt with some movement of anterior teeth as well

22
Q

Helixes are used for

A

activation and increase the range of tooth movement

23
Q

Tongue Crib

A

For correcting tongue or finger habit

24
Q

F/D does not include

A

The geometry of the specimen in the calculation s

25
Q

Extrinsic stiffness measured by

A

F/D curve

26
Q

Intrinsic stiffness measured by

A

S/S curve

27
Q

Springback

A

Ability to return to original shape

28
Q

Range

A

The distance a wire can be bent before permanent deformation

29
Q

Strenght

A

stiffness x range

30
Q

Resilience

A

Area under the S/S curve out to the proportional limit

31
Q

Formability

A

Amount of permanent deformation a wire can withstand before failure

32
Q

Ideal orthodontic wires

A 
High strength 
Low stiffness
High range
High formability
Cabibilthy of solder
33
Q

Adding loops to archwire

A

Increase length =increases range and springiness

34
Q

NiTi Wires

A

Low stiffness
Good Strenght
High range
Poor formability

35
Q

Initial alignment archwire

A

NiTi or SS

36
Q

Leveling archwire

A

TMA or SS

37
Q

Torquing wire

A

Rectangular SS or TMA

38
Q

Finishing archwire I

A

SS or TMA

39
Q

Center of resistance

A

A point at which resistance to movement can be concentrated for mathematical analysis

40
Q

Root resorption C moves

A

Coronally

41
Q

Alveolar bone loss C moves

A

apically

42
Q

If the line of action of a force does not pass through the C the force will

A

Produce some rotation of the tooth. This potential for rotation is measured as a moment

43
Q

Center of rotation

A

The point around which an object is rotating

44
Q

Can C rot be changed

A

Yes to achieve different types of tooth movement and clinical goals

45
Q

Translation all point on an object move

A

In the same direction at the same rate

46
Q

To produce translation, the line of action of a single force

A

Needs to pass through C res

47
Q

It is _______ rather than the point of attachment determines whether translation is produced

A

Line of action

Ortho Part A (5 decks)

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