Extractions and Anchorage Flashcards
Serial extraction is done when there’s at least ____ mm of crowding.
10
This clinical observation determines whether you should do serial extraction.
Crowding in the mandibular anterior teeth where the laterals are lingually locked or rotated.
For serial extraction, which teeth are extracted first and why?
Primary canines to ease anterior crowding.
In serial extraction, extract these teeth 6-12 months before their normal exfoliation.
Mainly benefits the mandibular arch.
Baby first molars
Maxillary eruption sequence in adult teeth.
1st PM, 2nd PM, Canine
Mandibular eruption sequence in adult teeth.
Canine, 1st PM, 2nd PM
In serial extraction, what tooth is extracted after the baby canines and first molars?
1st premolars
Serial extraction summart (Extract teeth in which order?):
1) Deciduous canines
2) Deciduous first molars
3) Deciduous first premolars
Do you get ideal occlusion with serial extraction?
Heck no
Benefits of Serial Extraction
- Naturally induced alignment of severely crowded anterior teeth.
- Improved periodontal health.
- Improved cosmetics/psychological state.
- Facilitates fixed appliance workload.
- Less possible orthogenic damage.
This was developed as a simple method of dealing with severe crowding problems.
Serial Extraction
An extraction procedure started in the early mixed dentition to avoid crowding in the permanent dentition.
Serial Extraction
Contraindications to Serial Extraction
- Class II or III relationship.
- Skeletal discrepancy.
- Deep overbites - need maxillary Hawley + biteplate.
- Imbalanced perioral musculature (strain, hypo/hyper tonicity.
- Habits (thumb sucking, tongue thrusting, lip biting, mentalis habit).
Tries to maintain the position of a tooth.
Anchorage
Head gear and Face masks are what type of anchorage?
Extraoral
Downward pull type of extraoral anchorage.
Cervical pull
Upward pull type of extraoral anchorage.
Parietal pull
Horizontal pull type of extraoral anchorage.
Occipital pull
Types of intraoral anchorage.
- Braces
- Rubber bands
Types of anchorage.
Simple
Stationary
Reciprocal
Tipping of the anchor tooth is what kind of anchorage?
Simple
Bodily movement of the anchor tooth is what type of anchorage?
Stationary
Type of anchorage where both teeth that are anchored move in equal and opposite amounts.
Reciprocal
The greater the root surface, the greater the what?
Resistance to stress
Qualities of Anchorage teeth that affect how good of an anchor they will be.
1) Root form
2) Root Surface Area
3) Root number
4) Root Length
The thickened ridge of bone that holds the teeth.
Alveolar process
The dense/compact bone that covers the spongy bone.
Cortical bone plate
Avascular bone
Cortical bone
Vascular bone
Cancellous (Trabecular/Spongy) bone
This type of bone has cellular changes when teeth move.
Cancellous
These use cortical bone as anchorage.
TAD’s
Temporary Anchorage Devices
