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Orthodontic Therapy 2019 > Tooth movement > Flashcards

Tooth movement Flashcards

1
Q

What is the force needed for Intrusion?

A

10-20g

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2
Q

What is the force needed for Tipping?

A

30-60g

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3
Q

What is the force needed for Rotation?

A

30-60g

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4
Q

What is the force needed for Extrusion?

A

30-60g

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5
Q

What is the force needed for Torque?

A

50-100g

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6
Q

What is the force needed for Bodily movement ?

A

60-120g

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7
Q

What are the cells involved in bone remodelling?

A

Osteoblasts
Osteoclasts
Osteocytes

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8
Q

What is the origin of OSTEOBLASTS?

A
  • Originate from mesenchymal stromal cells

- Lie on the surface of bone

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9
Q

What is the origin of OSTECLASTS?

A
  • Originate from blood monocytes

- Multinucleated cells

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10
Q

What is the Hormone responsible for tooth movement ?

A

PROSOGLANDIN

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11
Q

What is the result of using HIGH forces ?

A

HIGH FORCES = undermining resorption

  • Occlude the capillaries > cell death NECROSIS > process called HYALINISATION
  • Tooth movement is delayed and bone commences from marrow spaces beneath the necrosis area after a few days. (10-14days delay)
  • Osteoclast have to migrate from adjacent undamaged areas
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12
Q

What is FORCE?

A

Force = vector that can be described by magnitude and directions
Components of force = moment of a force and couple

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13
Q

What is the role of OSTEOBLASTS in bone remodelling?

A

Responsible for production of bone organic matrix and mineralization

  • Recrut and activate osteoclast via produvtion of cytokines
  • Main regulator of bone remodeling
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14
Q

What is the role of OSTEOCLASTS?

A
  • Responsible for bone resorption
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15
Q

What is a force couple?

A
  • 2 opposite and equal forces act to cause pure rotation
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16
Q

What is Centre of resistance and where?

A

point in the body where the resistance is concentrated
single rooted tooth - halfway down the root
multi rooted tooth - furcation area

17
Q

What are the components of Force?

A

moment of a force and couple

18
Q

Moment of force calculation ?

A
  • tends to cause rotations
  • calculated as:
    MAGNITUDE of the force x Perpendicular DISTANCE from the point of force application to the centre of resistance of a tooth

Orthodontic Therapy 2019 (14 decks)

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