Lab Week 1 - Fixed vs. Removable Orthodontic Tx Flashcards
Types of retainers ?
Conventional removable.
Thermoplastic.
Bonded.
What type of HSSW is a transpalatal arch, quadhelix and palatal arch with nance button constructed from ?
0.9mm HSSW
What are the three uses for a transpalatal arch ?
Anchorage. Rotation. Limited widening or contraction.
What is the purpose of a palatal arch with nance button ?
Anchorage.
What are the seven used for a quadhelix ?
Bilateral expansion.
Asymmetrical expansion.
Fan style expansion.
Rotation of molars.
Expansion in cleft palate.
Modified to procline incisors.
Assist in habit breaking.
Name some advantages of fixed orthodontics.
Bodily tooth movement.
Fix rotations.
Used in both upper and lower arch.
Individual force can be applied to every tooth.
Cannot be removed by patient.
Works all the time.
Precise 3D movement of teeth.
Less invasive of tongue space.
Minimal palatal coverage.
Name some disadvantages of fixed orthodontics.
Increased risk of root resorption.
Decalcification.
Perceived as visually unattractive.
Soft tissue trauma.
More expensive.
High motivation required in OH.
Poor anchorage.
Specialist training required.
Etching teeth is destructive to tooth tissue.
Name some advantages of removable orthodontics.
Tipping of teeth.
Good anchorage.
Cheaper.
Shorter chair side time.
OH easier to maintain.
Non-destructive to tooth surface.
Less specialist training required.
Easily adapted for OB reduction.
Achieves block movements.
Name some disadvantages of removable orthodontics.
Less precise control of tooth movement,
Easily removed by patient.
Only moving 1-2 teeth at one time.
Specialist technical staff required.
Rotations hard to correct.
What material is an orthodontic arch wire made out of ?
Nickel-titanium alloy.
Why is the material for an orthodontic arch wire used ?
Nickel-titanium alloy - elastic properties - wants to return to original shape (shape memory).
