w8 corticotomy facilitated orthodontics

Question 1

an adjunctive method to facilitate orthodontic tooth movement in adults

Answer 1

corticotomy (cortical bone excision)

Question 2

what causes alveolar bone resoprtion

Answer 2

compression of PDL

Question 3

what causes alveolar bone deposition

Answer 3

stretching of PDL

Question 4

what consist of the PDL (4 things)

Answer 4

collagenous fibers, cellular elements, tissue fluids, biochemical messengers

Question 5

what allows PDL to act as shock absorber

Answer 5

tissue fluidsd

Question 6

in light force, the blood vessels of PDL become what

Answer 6

compressed

Question 7

in light force, what from the PDL side restores the PDL and allows the tooth to move

Answer 7

frontal resorption

Question 8

in heavy focrce, what happens to the blood vessels of PDL

Answer 8

become totally occluded, and sterile necrosis ensures

Question 9

in heavy force, what from the medullary bone side restores the PDL and allows the tooth to move

Answer 9

undermining resorption

Question 10

frontal resopriton ie osteoclastic resoprtion of the lamina dura from the root side, osteoclasts activated from a non-necrotic PDL

Answer 10

light force

Question 11

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

Answer 11

heavy zone

Question 12

tooth movement is facilitated by the formation fo what cells which are proportional to the number of what spaces

Answer 12

resorptive cells
marrow spaces

Question 13

children vs adult medullary bone (which has larger marrow spaces and which as fewer and smaller)

Answer 13

children - larger marrow spaces, spongiosa to alveolar crest

adult - fewer and smaller marrow spaces, dense alveolar crest

Question 14

light force is frontal resorption on what side of lamina dura

Answer 14

PDL side

Question 15

heavy forces is undermining resorption on what side of lamina dura

Answer 15

bone side

Question 16

what force is minimal patient discomfort and minimal potential for root resorption

Answer 16

light forces

Question 17

which is potential for patient discomfort and potential for root resorption

Answer 17

heavy forces

Question 18

what does prostaglandin do and where is in injected

Answer 18

injected in PDL
increases the rate of tooth movement

Question 19

what does bisphosphate, fosamax do and treat what

Answer 19

treat osteoporosis
depresses the response to orthodontic tooth movement

Question 20

what to treat arthritis and how does it work

Answer 20

prostaglandin inhibitors e.g. indomethacin or NSAID
depresses response to orthodontic tooth movement

Question 21

what does corticotomy do

Answer 21

facilitates orthodontic tooth movement

Question 22

does corticotomy involve osteotomy type tooth/bone movemnet?

Answer 22

no

Question 23

does corticotomy illicit an inflammatory response?

Answer 23

yes

Question 24

what is one possible untoward consequence of corticotomy

Answer 24

root resorption

Question 25

corticotomy on a long bone does what

Answer 25

lengthens the long bone (generates new bone) by progressively distracting the bony segments