Lec 13 - Ortho Movement of Teeth
In normal Function, the force is less than 1 sec and less than 50 kg. What's the effect on the PDL?
Cementum resporbs
PDL fluid moves within the PDL
Blood flow is cut off due to compression of PDL
Alveolar bone bends
What is the rate determening step in orthodontic tooth movement?
Alveolar bone resorption
Alveolar bone deposition
A mixture of resorption/deposition
None of the above
In what time frame do the blood vessels of the PDL occlude on SUSTAINED heavy pressure
1-2 sec
3-5 sec
7-10 sec
30 sec
In what time frame is the PDL fluid expressed on SUSTAINED heavy pressure
1-2 sec
3-5 sec
7-10 sec
30 sec
Hyaline necrossis in response to sustained heavy pressure occurs within
25 minutes
A few hours
A few days
Hyaline necrosis does not occur
Undermining resorption in response to sustained heavy pressure occurs within
25 minutes
A few hours
A few days
Does not occur
What is Undermining resorption?
A form of cell death
Repair response to trauma
SML
Type of trauma
Tissue hyalinization
Promotes tooth movement
Increases root formation
Prevents tooth movement
Increases alveolar bone resorption
What is the Y axis?
Newtons
Pascals
Cm
Mm
SML
In response to light sustained pressure, what happens after HOURS?
CAMP increased
Blood vessels in PDL partially compressed
Blood flow restricted to area
Frontal resorption begins
What is Red curve?
Hyalinization
Frontal resorption
Ossification
Undermining resorption
What is green curve?
Hyalinization
Frontal resorption
Ossification
Undermining resorption
What are the x and y axis respectively
X - rate of movement; y - stress
X -% resorption; y - stress
X - stress; y - % resoprtion
X - stress; y - rate of movement
Distratction osteogenesis applies to
Incisors only
Canines only
Premolars only
Molars only
Applies to all teeth
Interseptal bone reduction - How many cases considered clinically significant?
2/18
9/18
16/18
4/18
12/18
What is wilkodontics?
Interseptal bone reduction
Preferrential bone resorption
Accelerated osteogenic orthodontics
Applied osteogenic orthodontics
Who first described Corticision?
Tu-Pac
Joseph Park
Young-Guk Park
Sun Young Park
Sun Win Kim
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