Ortho 2 Test One

Question 1

What is the optimal force to create rotational movement of a tooth?

Answer 1

35-60 gm

Question 2

What is the optimal force to create translational movement of a tooth?

Answer 2

70-120

Question 3

What is the optimal force to create intrusive movement of a tooth?

Answer 3

10-20

Question 4

What represents stiffness in a force-deflection curve?

Answer 4

Slope

Question 5

At what point does permanent deformation occur?

Answer 5

The yield point

Question 6

What three things are prescribed with orthodontic brackets?

Answer 6

1. Torque, 2. Angulation and 3. Offset

Question 7

What is the traditional retainer?

Answer 7

Hawley’s retainers

Question 8

What is the type of retainer that is clear?

Answer 8

Essix retainer

Question 9

What is the unmineralized, organic portion of bone called before it remineralizes?

Answer 9

Osteoid

Question 10

What is the breakdown of bone?

Answer 10

70% inorganic, 25% organic and 5% water

Question 11

How long does it take for woven bone to be replaced by lamellar bone?

Answer 11

12 weeks

Question 12

What is the anchorage value of the tooth equal to?

Answer 12

Its root surface area

Question 13

What is the minimum amount of time between ortho appointments?

Answer 13

3 weeks

Question 14

How long does undermining resorption take to occur?

Answer 14

7-14 days

Question 15

What tends to work best if an ortho patient needs an endo?

Answer 15

Fill the canal with calcium hydroxide and perform endo after tooth movement has been accomplished

Question 16

How does orthodontic treatment affect roots?

Answer 16

It makes them shorter, but not thinner

Question 17

What are the three categories of orthodontic root resorption?

Answer 17

1. Slight bunting, 2. Moderate resorption (= 1/4), and 3. Severe resorption (>1/4)

Question 18

What percentage of teeth show root resorption in ortho?

Answer 18

50% overall and 90% of max. incisors

Question 19

What is the incidence of moderate to severe root resorption?

Answer 19

3% juvenilles and 4% adults

Question 20

What orthodontic movement is most associated with root resorption?

Answer 20

Intrusion

Question 21

What results from continual tongue pressure against the teeth?

Answer 21

Crenated tongue

Question 22

What does an occipital pull headgear restrict?

Answer 22

Anterior and inferior maxillary growth

Question 23

What does a cervical pull restrict?

Answer 23

Superior and anterior maxillary growth

Question 24

What is the range of maxillary expansion using a jackscrew?

Answer 24

5-15 mm

Question 25

What is the rapid expansion rate of the maxilla?

Answer 25

3-7 mm a week

Question 26

What is considered slow expansion of the maxilla?

Answer 26

1-2 mm a week

Question 27

What procedure is performed if maximal skeletal movement is desired without dental movement?

Answer 27

Implant-supported expansion

Question 28

What is the furthest mandibular centrals can be moved?

Answer 28

2mm

Question 29

What are the lateral expansion limits for mandibular teeth?

Answer 29

(canines) 0-1, 2, 2-3, 3 (molars)

Question 30

What is a Delaire-type facemask used for?

Answer 30

Class three occlusion

Question 31

How could the mandible be potential grown larger?

Answer 31

By holding it in the protrusive position

Question 32

What is orthodontic camouflage?

Answer 32

Moving teeth to disguise skeletal abnormalities