theories of craniofacial growth Flashcards
an area where growth occures
Site of growth
A site of growth that has the ability to grow on its own independently of its surrounding
Center of growth
Are all centers a growth site
Yes, but not vice versa
the way growth occures
Mode of growth
Modes of growth
endochondral ossification
Intramembraneous ossification
how growth changes occur at a higher level
Mechanisms
The cause of observed growth changes
Determinant
who popularized the suture theory of craniofacial growth
Harry Sicher
where did Dr. Sicher observe new bone forming
At the synchondrosis of the cranial base
Mandibular condyle
Sutures of the cranial and facial bones
Harry Sicher’s theory
Pressures created by formation of new bone at sites pushed the bones apart
- in the absence of cartilage, the intramembranous bones are able to determine thier own growth
what determined bone growth in suture theory
genetic info
are sutures and periosteal primary determinant of craniofacial growth
No, they are sites, not centers
what causes growth at sutures
when sutures are pulled apart, growth occurs to fill gap
what is the cartilage theory of bone growth
cartilage growth would push the bones to new positions, in response, bone would fill in at sutures and surface remodeling would occur
what did scott hypothesize about the nasal septum
The cartilaginous nasal septum served as a pacemaker for maxillary growth
is the epiphyseal plate a growth center
Yes, because it grows when moved
is mandibular condylar caritlage a growth center
No
does the nasal septum determine growth of the maxila
yes, at least partially
what happens if you lose condylar cartilage
most the time the condyl came back with cartilage
sometimes Supreme growth problems occure
- usually from problems with injuring soft tissue surrounding it
the functional matrix theory
growth in the cranium and face occures as a response to functional needs and is mediated by the soft tissue adjacent to the skeletal units
-bone and cartilage react to the external soft tissues
what is ankylosis
Fusion across a joint sot hat motion is limited and prevented
what determines the soft tissue for the functional matrix method
genetics
Epigenetics
Genetic control at a distance
