Class 5

Question 1

Removable appliances advantages

Answer 1

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

Question 2

Removable appliances disadvantages

Answer 2

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

Question 3

Removable appliances primary use

Answer 3

Growth modification
Minor tooth movements
Retention

Question 4

Bionator

Answer 4

Stimulate mandibular growth

Control tooth eruption

Question 5

Twin block

Answer 5

Stimulate mandibular growth
Can include an expander
Can add headgears

Question 6

Frankle Appliance

Answer 6

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

Question 7

Reverse Pull headgear

Answer 7

For preadolescent exhibiting maxillary deficiency

Question 8

Anterior bite plates

Answer 8

To decrease overbite

Question 9

Posterior bite plates

Answer 9

To increase overbite

Question 10

Spring Retainers

Answer 10

Used for both retention and minor tooth movement

Question 11

Tooth Positioners

Answer 11

Used for minor tooth movement and retention

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

Question 12

Begg Appliance

Answer 12

Added axullary springs for root control

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

Question 13

1st order bends are needed to

Answer 13

Compensate for horizontal position variations

Question 14

Pre-adjusted edgewise

Answer 14

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

Question 15

Mesial distal angulation

Answer 15

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

Question 16

2nd order bends

Answer 16

Needed to change mesial distal angulation

Question 17

Third order

Answer 17

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

Question 18

Typical components of modern edgewise appliances

Answer 18

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

Question 19

Open coil springs

Answer 19

For opening space retracting teeth

Question 20

Closed coil springs

Answer 20

Maintaining space

Question 21

Pendulum appliance

Answer 21

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

Question 22

Helixes are used for

Answer 22

activation and increase the range of tooth movement

Question 23

Tongue Crib

Answer 23

For correcting tongue or finger habit

Question 24

F/D does not include

Answer 24

The geometry of the specimen in the calculation s

Question 25

Extrinsic stiffness measured by

Answer 25

F/D curve

Question 26

Intrinsic stiffness measured by

Answer 26

S/S curve

Question 27

Springback

Answer 27

Ability to return to original shape

Question 28

Range

Answer 28

The distance a wire can be bent before permanent deformation

Question 29

Strenght

Answer 29

stiffness x range

Question 30

Resilience

Answer 30

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

Question 31

Formability

Answer 31

Amount of permanent deformation a wire can withstand before failure

Question 32

Ideal orthodontic wires

Answer 32

``` High strength Low stiffness High range High formability Cabibilthy of solder ```

Question 33

Adding loops to archwire

Answer 33

Increase length =increases range and springiness

Question 34

NiTi Wires

Answer 34

Low stiffness Good Strenght High range Poor formability

Question 35

Initial alignment archwire

Answer 35

NiTi or SS

Question 36

Leveling archwire

Answer 36

TMA or SS

Question 37

Torquing wire

Answer 37

Rectangular SS or TMA

Question 38

Finishing archwire I

Answer 38

SS or TMA

Question 39

Center of resistance

Answer 39

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

Question 40

Root resorption C moves

Answer 40

Coronally

Question 41

Alveolar bone loss C moves

Answer 41

apically

Question 42

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

Answer 42

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

Question 43

Center of rotation

Answer 43

The point around which an object is rotating

Question 44

Can C rot be changed

Answer 44

Yes to achieve different types of tooth movement and clinical goals

Question 45

Translation all point on an object move

Answer 45

In the same direction at the same rate

Question 46

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

Answer 46

Needs to pass through C res

Question 47

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

Answer 47

Line of action