Exam 3 - Dentofacial Orthopedics Pt 1

Question 1

With regards to dentofacial orthopedics, what must be sacrificed? Skeletal imbalances or dental malocclusion

Answer 1

correct the skeletal imbalance and the dental malocclusion gets sacrificed

Question 2

What did Monson and Felts (1961) do?

Answer 2

• in vivo compression of rat humeri
• total volume of bone remains in normal limits
• direction of growth altered –> change in shape

Question 3

The Ndebele women wear rings around their neck. What happens when these are removed?

Answer 3

neck muscles quickly tire and collapse, thus resulting in suffocation (cannot maintain the airway)

Question 4

In patients with polio that have to wear a milwaukee brace. What happens?

Answer 4

displacement of the hyoid bone

Question 5

What is synostosis?

Answer 5

normal fusion of two bones (epiphysis with diaphysis of endochondral (long) bones)

Question 6

What is dysostosis?

Answer 6

abnormal bone fusion

Question 7

abnormal fusion of neighboring digits

Answer 7

syndactyly

Question 8

synostosis within joints (at the periodontal ligament)

Answer 8

ankylosis

Question 9

abnormal fusion of two or more cranial bones (at the sutures)

Answer 9

craniosynostosis

Question 10

When using a palatal expander, what is the prescription given to make 1 mm?

Answer 10

each activation is 1/4 turn of the screw (1/4 mm).

**SO, to get an entire 360 activation, you need 4 turns to make 1 mm.

Question 11

After rapid palatal expansion, what teeth relapse the most?

Answer 11

anterior teeth (canines)

Question 12

After rapid palatal expansion, what is the effect on posterior teeth?

Answer 12

they are relatively stable

Question 13

After rapid palatal expansion, what happens do the nasal cavity?

Answer 13

it grows to a bigger dimension

Question 14

What did Chatelier and Chateau (1963) do?

Answer 14

• surgical palatal expansion on anesthetized pt’s
• done in a few hours instead of 3 to 4 weeks

*done on pt’s that are done growing

Question 15

What do posterior and inferior views of the maxilla illustrate?

Answer 15

pyramidal processes of palatine bones are interlocked between lateral and medial pterygoid plates of the sphenoid bone

Question 16

What is the transverse differential dimension in males for estimating palatal expansion?

Answer 16

1.6 mm

Question 17

What is the transverse differential dimension in females for estimating palatal expansion?

Answer 17

1.2 mm

Question 18

When and where is new bone formed during palatal expansion?

Answer 18

-formed at midpalatal suture
-within 1-3 months

Question 19

What are three positive effects of a palatal expander?

Answer 19

1. increase intercanine distance
2. increase intermolar distance
3. increase perimeter of dental arch

Question 20

What are 2 negative effects of a palatal expander?

Answer 20

1. maxillary buccal crossbite
2. buccal alveolar bone loss

Question 21

What should you expect as the maximum orthopedic effect of head gear on the palate?

Answer 21

-4 to -8mm of anterior nasal spine movement

Question 22

What are the 5 indications for cervical head gear?

Answer 22

1. prevents anterior growth of the palate
2. reduces class II dental to class I dental
3. extrudes the molars
4. reduces overbite and overjet
5. increases lower anterior facial height

Question 23

What are the 4 indications for oblique head gear?

Answer 23

1. prevents anterior growth of palate
2. reduce class II skeletal to class I skeletal
3. reduces lower anterior facial height
4. induces forward movement of the chin