Concepts of Growth and Dev. Pt 2 Flashcards Preview

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Flashcards in Concepts of Growth and Dev. Pt 2 Deck (56)
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1

what is the most common reason to remove mand. 3rd molars?

To prevent incisor crowding

2

In class we covered 2 studies regarding 3rd molars as the cause of mandibular incisor arch crowding. What did each conclude?

1-the removal of third molars to reduce or prevent late incisor crowding cannot be justified
2- there was not enough evidence to incriminate third molars as being the only or even a major etiologic factor in the late lower dental arch crowding

3

One theory is that crowding develops as the mandibular incisors, and perhaps the entire mandibular dentition moves in what direction?

distally relative to the body of the mandible.

4

what other factors may be responsible for mandibular crowding?

1-posterior wear
2- stress, clenching, grinding
3-changes in muscular forces

**ultimately the cause is unknown

5

based on a study, who is more likely to recommend prophylactic removal of 3rd molars, surgeons or orthodontists?

Surgeons

*orthos are increasingly under the thought that 3rd molars do not cause incisal crowding

6

what is intrauterine molding?

distortions on the face or body due to pressure against the baby while in utero.

*baby's arm pressed against his face can result in a facial depression because there is a decrease in amniotic fluid to that area

7

Pierre Robin Sequnce

-small jaw
tongue falls back in throat
difficulty breathing
-cleft palate
-acid reflux
-sox 9 gene
-AD
-Repeated ear infections
-Teeth that appear when the baby is born (natal teeth)
- congestive heart failure
-hypertension

8

Pierre robin sequence TX

-break the jaw and use a device to move the jaw forward
-lip-tongue adhesion to tether tongue anteriorly

*fix cleft palate, may beed tracheotomy, tympanostomy tubes, monitor

9

what evidence is there that the mandibular condyle is not a growth center?

if the lateral pterygoid muscle rips the head of the condyle off, there is no growth impairment

10

if the condyle breaks off and resorbs what happens?

80% chance it will regenerate from the periosteum

11

5 late causes of TMJ injuries

1-Facial asymmetry,
2-Malocclusion,
3-Growth disturbance, 4- Osteoarthritis,
5- ankylosis (fusion across the joint so that motion is impaired

12

if TMJ trauma occurs, the px can experience what 5 things?

1-Limited opening and excursive movements
2-Deviation of opening
3-Malocclusion manifesting in cross-bites
4-Short ramus height
5-Hyper-eruption of the teeth on the opposite side, infra-eruption on the ankylosised side

13

what is the most common cause of facial asymmetry in regards to the condyle?

trauma--the condyle may fail to grow vertically

14

Cleft lip results from failure of what to fuse?

maxillary swelling to fuse with the intermaxillary process

*can be unilateral or bilateral

15

cleft palate results from what failing to fuse?

two palatine shelves

16

In patients with bilateral cleft lip, the _________ is situated too far forward beyond the tip of the nasal septum

primary palate

17

cleft lip may be caused by what 3 drugs?

1-phenytoin
2- vitamin A
3-Methotrexate

18

what 4 drugs can cause cleft palate

1- phenytoin
2- Vit. A
3- corticosteroids
4-cigarette smoke

19

How common is cleft lip

1 or 2 out of 1000

20

clefts are more common in ?

Asian, Latino, or Native American descent

21

what state has highest cleft incidence?

Utah at 2.2/1000

22

babies born with a cleft lip or palate will have trouble eating. what do you do?

make a good seal in oral cavity, make sure baby doesn't choke, use obturator

23

Muscular derangments in cleft lip and palate patients cause the malformation of what muscles to worsen?

1-The superior pharyngeal constrictor muscle attaches to the posterior aspect of the maxillary palatal shelves.
2-orbicularis oris

24

before surgery what device is used as a orthopedic tx?

1-The nasoalveolar molding device or NAM is a very elaborate passive or active device

**made of acrylic and later in tx wires are added for protracting forces of nares and coumella

25

what is a Latham device

intraoral device to bring palate loser together

*will require an extra surgery

26

when should surgery for lip closure be done?

3-6 months of age and baby weighs at least 10 lbs

27

beyond lip repair, what 4 things will need to be improved?

1-hearing
2-speech
3-dental work
4-psychosocial integration issues

28

. Cleft lip surgery is usually done before age ___ months, and cleft palate surgery is done before ___months

12, 18

29

what is the goal of surgical tx for cleft palate?

to create a palate that works well for speech.

30

As kids grow older, they might need additional surgeries, such as an ____ ____ ___ which is used to close the gap in the bone or gums near the front teeth.

alveolar bone graft,