Aligner ortho Flashcards
What was the first advent of invisalign that did not work well?
Computer assisted design: couldn’t replicate in mouth
If force is only applied to crown of tooth w invisalign, what happens to tooth?
Tipping only around center of resistance
How do you get control of the force on the root?
Attachments/auxillaries
Do bracket ortho push, pull, or both?
Both push and pull
Does invisalign push, pull, or both?
ONly push
How much overjet can be achieved w elastics and invisalign?
4 mm correction
*Used to open the bite
*Placed by technician in the
most appropriate locations
Used on lingual of max anteriors to correct deep bite
Used on molars to treat open bite
Bite ramps
*Great to level the curve of Spee
by extruding and uprighting
lower molars.
*Less proclination of lower
incisors
Bite ramps
____ used to correct overjet
Elastics
___ used to correct overbite
Bite ramps
How do you translate tooth w invisalign?
2 attachments pushing in opposite directions
Center of rotation is moved to infinity by creating a simple force at center of resistance in order to cancel rotational tendency of moment created by F at bracket level, counter moment equal and opposite must be incorporated into the force system. If moments are equal and opposite ______ will occur
Translation
Do invisalign aligners work well with translation in extraction cases?
No
Labio-lingual Torque
*Used to place torque on the
teeth
*They are ridges in
the aligner, NOT on the surface
of the teeth.
Power ridges:
*Correct Class II and
Class III malocclusion
*Increase anchorage
*Correct midlines
Elastics
