4010 tutorial questions Flashcards
What type of force involves the crown of the tooth tipping around the fulcrum?
Tipping
How do functional appliances influence the eruption of teeth?
Anterior bite-planes during over bite reduction free the occlusion of lower molars allowing them to erupt.
Buccal capping eliminates incisor interferences freeing contacts between incisors and can be utilised when intrusion of the buccal segments is required.
What is the function of round archwire?
tipping and vertical movements and the interaction between archwire and the wall of the bracket
This generates a ‘force couple’ creating apical and rotational movement
What is the function of rectangular archwire?
Controls the root apex in a buccolingual direction, which is known as ‘torqueing’
What are the class 1 of elastic bands?
positioned horizontal
linked brackets one of your jaw
space closure between teeth
Class 2 elastics
connect teeth on upper to molars on lower jaw
correct excess overjet
Class 3 elastics
connect teeth on lower jaws to molars on upper jaws
correct underbite
Vertical elastics
Link teeth on upper jaw with teeth below them on lower jaw.
Correct openbite.
Cross elastics
Connect teeth in upper and lower jaw
cross front teeth
correct crossbite
Functions of archwires
Elimination of rotations
Development of arch form
Levelling of arches
Control of torque
Purpose of Initial archwires
0.012 x 0.014 NiTi
Used to correct rotations
initiate levelling and alignment
Develop arch form
Intermediate archform
0.02 x 0.02 CuNiTi
Completes any rotation correction
continues levelling
torque control
develops arch form
Later stage arch form
0.019 x 0.025
Closes space following initial levelling and alignment
Reduces overjet
Corrects centrelines
Springback
Ability of a wire to return to its original shape
Stiffness
Amount of force required to deflect or bend a wire
