w8 corticotomy facilitated orthodontics Flashcards
an adjunctive method to facilitate orthodontic tooth movement in adults
corticotomy (cortical bone excision)
what causes alveolar bone resoprtion
compression of PDL
what causes alveolar bone deposition
stretching of PDL
what consist of the PDL (4 things)
collagenous fibers, cellular elements, tissue fluids, biochemical messengers
what allows PDL to act as shock absorber
tissue fluidsd
in light force, the blood vessels of PDL become what
compressed
in light force, what from the PDL side restores the PDL and allows the tooth to move
frontal resorption
in heavy focrce, what happens to the blood vessels of PDL
become totally occluded, and sterile necrosis ensures
in heavy force, what from the medullary bone side restores the PDL and allows the tooth to move
undermining resorption
frontal resopriton ie osteoclastic resoprtion of the lamina dura from the root side, osteoclasts activated from a non-necrotic PDL
light force
undermining resorption ie osteoclastic resorption of the lamina dura from the medullary bone side; osteoclasts activated from the medullary bone as the PDL exhibits a sterile necrosis or hyalinized zone
heavy zone
tooth movement is facilitated by the formation fo what cells which are proportional to the number of what spaces
resorptive cells
marrow spaces
children vs adult medullary bone (which has larger marrow spaces and which as fewer and smaller)
children - larger marrow spaces, spongiosa to alveolar crest
adult - fewer and smaller marrow spaces, dense alveolar crest
light force is frontal resorption on what side of lamina dura
PDL side
heavy forces is undermining resorption on what side of lamina dura
bone side
what force is minimal patient discomfort and minimal potential for root resorption
light forces
which is potential for patient discomfort and potential for root resorption
heavy forces
what does prostaglandin do and where is in injected
injected in PDL
increases the rate of tooth movement
what does bisphosphate, fosamax do and treat what
treat osteoporosis
depresses the response to orthodontic tooth movement
what to treat arthritis and how does it work
prostaglandin inhibitors e.g. indomethacin or NSAID
depresses response to orthodontic tooth movement
what does corticotomy do
facilitates orthodontic tooth movement
does corticotomy involve osteotomy type tooth/bone movemnet?
no
does corticotomy illicit an inflammatory response?
yes
what is one possible untoward consequence of corticotomy
root resorption
corticotomy on a long bone does what
lengthens the long bone (generates new bone) by progressively distracting the bony segments
