BDS3 revision Flashcards

1
Q

what are the 3 theories of how orthodontic tooth movement occurs

A

piezo electric - historical
mechano-chemical - bunching of osteoblasts in compression areas allows osteoclast action
differential pressure - tension sees deposition, compression sees resorption

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2
Q

light pressure for orthodontic tooth movement impact at cell level

A

hyperaemia at tension and compression sides
PDL has time to remodel
(gingival fibres stay distorted - main reason for relapse)

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3
Q

hyalinisation

A

cell death due to blood vessel occlusion - leaves a cell free zone

seen in root resorption and when moderate forces used for tooth movement

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4
Q

consequences of excessive forces for tooth movement

A

root resorption
loss of vitality
loss of anchorage

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5
Q

how does mandibular growth occur after birth

A

surface deposition
growth at cartilages - mainly condylar cartilage

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6
Q

3 methods of facial growth

A

sutures - joints between intramembranous bones
synchondroses - cartilaginous joint that pushes bone apart
surface depositon - remodelling

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7
Q

2 theories of facial growth

A

cartilaginous - cartilage generates forces
functional matrix - growth of functional units stimulates growth e.g coronoid in response to temporalis growth

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