Concepts of Growth and Dev. Pt 2 Flashcards Preview

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

To prevent incisor crowding


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


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.


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


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


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


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


Pierre Robin Sequnce

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


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


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


if the condyle breaks off and resorbs what happens?

80% chance it will regenerate from the periosteum


5 late causes of TMJ injuries

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


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


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

trauma--the condyle may fail to grow vertically


Cleft lip results from failure of what to fuse?

maxillary swelling to fuse with the intermaxillary process

*can be unilateral or bilateral


cleft palate results from what failing to fuse?

two palatine shelves


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

primary palate


cleft lip may be caused by what 3 drugs?

2- vitamin A


what 4 drugs can cause cleft palate

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


How common is cleft lip

1 or 2 out of 1000


clefts are more common in ?

Asian, Latino, or Native American descent


what state has highest cleft incidence?

Utah at 2.2/1000


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


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


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


what is a Latham device

intraoral device to bring palate loser together

*will require an extra surgery


when should surgery for lip closure be done?

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


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

3-dental work
4-psychosocial integration issues


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

12, 18


what is the goal of surgical tx for cleft palate?

to create a palate that works well for speech.


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,