Growth and Facial development Flashcards
Replacement of the cartilage matrix by an osseous matrix
Indirect growth
- Long bones growth pattern
* Involves growth centers or growth plates
Indirect growth
- Where the cartilage matrix is replaced by immature bone
* Genetically programmed
Growth plates
- A bony structure will be displaced during growth.
- In order to preserve the shape, parts of the bone will receive new bone and parts will resorb.
- Placing a V on a growing osseous structure will determine the direction of growth
- The V is placed on the growth surface. Apposition surfaces are in the center of the V while resorbing surfaces are located outside the V
V principle of Enlow
What is the only endochondral bone growth in the face?
Cranial base
______: allows volume increase and displacement in space while maintaining the proper shape
Drift principle
•The bone formation occurs directly in a vascularized mesenchyme.
Intramembranous ossification
New bone forms on the _____ aspect of the bone while bone is resorbed on the _____ aspect
external; internal
Intramembranous growth will result in _____ of other structures in space
displacement
- Bone apposition at the level of the sutures, resulting in an increase of the size of the bone.
- Cranial growth and maxillary growth
- Not mandibular growth
Sutural growth
- Until the age of 7: mainly sutural growth
- Once the eye and brain growth completed:–Bony apposition in the tuberosity area and dentoalveolar growth (displacement)
- At this stage, the maxilla is moving away from cranial base
Maxillary growth
Sutures stop growing at ____ years of age
8 yrs
Maxillary growth grow mainly via what 2 forms of growth?
Appositional and sutural growth
T/F: The anterior aspect of the maxilla is actually resorptive
True
T/F: Once sutural growth completed (around 10 years old), antero-posterior growth is the result of growth in the tuberosity region
True
_____: manipulate the growth here but can’t actually grow as much bone as growth center
Growth site
______: tension placed on the suture results in bone apposition ( Rapid palatal expansion)
Sutural growth
Dentoalveolar by using teeth as ______
1.Extrusion of teeth will result in bony apposition
distractors
What are the 2 modes of growth enhancement of the maxilla?
Sutural growth
Dentoalveolar
Are condyles genetically programmed or do they respond to environment dramatically?
Both
Are condyle growth sites or centers?
Sites
The growth of the posterior segments is responsible for the displacement of the mandible.
posterior
The growth of the posterior segments is responsible for the _____ of the mandible.
displacement
The _____ must grow vertically to adjust to maxillary growth and maintain rest position
ramus
The ramus must grow ______ to adjust to maxillary growth and maintain rest position
vertically
______: Posterior growth resulting in an anterior displacement of the mandible
Ramus
_____: Superior growth direction as well as lateral resulting in an anterior displacement of the mandible.
Condyle
