Intrmaxillary Anchorage

8/3/2019 Intrmaxillary Anchorage

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INTERMAXILLARY

ANCHORAGE

Dr. Stella ChaushuDept. of Orthodontics


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ANCHORAGE


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INTERMAXILLARY ANCHORAGE

example


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Example inverted plane


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Example S elastics


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Example- removable appliance with screen


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exampleFunctional appliances twin block


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examples

Functional appliances activator


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Example intermaxillary elastics

Class II elasticsClass III elastics


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advantages

No need for extraoral appliances

Easy to manipulate Full time wearing possible

Low cost (not including functional appliances)


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INTERMAXILLARY ANCHORAGEdisadvantages

Loss of anchorage!

Dental / skeletal side effects Patient cooperation mandatory


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Functionalappliances

Skeletal: Acceleration of mandibular growth

Restraint of maxillary growthDental: Backward movement of maxillary teeth

Forward movement of mandibular teethDifferential eruption of teeth

Clockwise rotation of mandible


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Class II elastics -dental effects

Sagittal : - Backward movement of

maxillary teeth

- Forward movement ofmandibular teeth

Vertical : - Extrusion of lower molars- Extrusion of upper incisors

Clockwise rotation of mandible


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-how to overcome loss of anchorage-

Anchorage unit:

bodily movement of anchorage teeth


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Anchorage unit:increase number of anchorage teeth


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Anchorage unit: preparation of anchorage


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Active unit: subdivision of movement (move teeth one by one)

Two step retraction


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Active unit: tipping movement

root movementcrown tipping


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EXTRAORAL

ANCHORAGE

Angle, 1907


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Cervical headgear


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Cervical headgear

Sagittal: Backward movement of molarsVertical: Extrusion of molars

Open the bite Clockwise rotation of mandible

Increase lower facial height


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High pull headgear


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High pull headgear

Sagittal: Backward movement of molars(less than cervical)

Vertical: Intrusion of molars

- Close (maintain) the bite

- Counterclockwise rotation of mandible

- Decrease (maintain) lower facial height


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Combination

headgear C-clasps


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J-hooks


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Headgears incorporated in

removable appliances


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EXTRAORAL APPLIANCES

1. Reinforce anchorage

2. Teeth movement

3. Orthopedic effect


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2. Active teeth movement


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3. Orthopedic effect


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3. Dentofacial orthopedics

Maxillary orthopedic system (MOPS)


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Class III Face mask



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Class III Chin cap, Patrick system



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EXTRAORAL ANCHORAGE

-advantages-

1.Absolute no loss of anchorage!

2. Orthopedic effects


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EXTRAORAL ANCHORAGE

-disadvantages-

1. Esthetics!2. Part time wearing

3. Dental / skeletal side effects

4. Patient cooperation mandatory

5. Safety?

6. Additional cost

Intrmaxillary Anchorage

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