Week 6 Temporary Anchorage Devices, Impacted teeth, Transplantation Flashcards
What is ortho anchorage?
resistance to undesirable tooth movement
What is skeletal anchorage?
utilizes either osteointegration (implants) or metal to bone mechanical resistance (TAD)
What is absolute anchorage?
makes it possible to perform tooth movement previously very difficult or impossible?
What can you do with using TAD?
Intrusion of posterior teeth ( intruding post teeth was not possible before TADs)
Distal movement of max molars as in Class II correction
Uprighting of posterior teeth
Space closure with maximum anchorage needs
Impacted teeth
When:
Impacted canines
Impacted 2nd molars
Make space
Surgical exposure
Attachment to the tooth
Orthodontic mechanics
How to handle impacted teeth
the way you handle an impacted tooth depends on how much crowding there is.
if there’s too much crowding, and there are teeth where the impacted tooth is supposed to be and it works well, maybe you can just extract the impacted tooth
What is autotransplantation?
Transplanting ectopic tooth
Missing maxillary incisors with premolars
Missing permanent first molars with 3rd molars
Technique for auto-transplantation?
Root formation of tooth to be transplanted should be at least 50% (1/2 to 2/3 formed, it is a problem if it is completely formed, by the time the root finishes formation, there is really a poor blood supply)
Careful surgical technique
Light orthodontic forces to align transplanted tooth
what can happen if you use too strong orthodontic forces?
- root resorption
- tooth will just not take
- can cause devitalization of the tooth and it’ll die
- ankylosis of the tooth
One reason why transplantation is good?
Allows continued vertical bone development
WHY do you place TADs on both sides?
because if you pull from one side, it’s not going to pull the molar straight up; it’ll tilt the tooth
TADs on both sides allows you to intrude the tooth more directly
