COA COA Orthodontic Materials & Equipment

Question 1

What type of material is most commonly used to bond orthodontic brackets to teeth?

Accepted Answer

Composite resin

Answer

Zinc phosphate cement

Answer

Glass ionomer cement

Answer

Zinc oxide eugenol

Question 2

Which instrument is used to remove excess bonding material from around newly placed brackets?

Accepted Answer

Scaler

Answer

Explorer

Answer

Hemostat

Answer

Band pusher

Question 3

What is the primary purpose of orthodontic separators (spacers)?

Accepted Answer

To create space between teeth before band placement

Answer

To hold archwires in place

Answer

To protect brackets from damage

Answer

To align teeth rapidly

Question 4

Which archwire material has the highest elastic memory and is most commonly used during initial alignment?

Accepted Answer

Nickel-titanium (NiTi)

Answer

Stainless steel

Answer

Cobalt-chromium

Answer

Beta-titanium

Question 5

What gauge ligature wire is most commonly used in orthodontics to tie archwires to brackets?

Accepted Answer

0.009 inch

Answer

0.010 inch

Answer

0.012 inch

Answer

0.014 inch

Question 6

What is the function of an open coil spring placed on an archwire?

Accepted Answer

To open (create) space between teeth

Answer

To retain tooth position after treatment

Answer

To close spaces between teeth

Answer

To expand the palate