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

Composite resin is the most widely used bonding material for orthodontic brackets due to its strong adhesion and good aesthetics.

Question 2

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

Accepted Answer

Scaler

Answer

A scaler is used to scrape away excess composite resin from around the bracket base before curing.

Question 3

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

Accepted Answer

To create space between teeth before band placement

Answer

Orthodontic separators are placed between contact points to create space for fitting orthodontic bands around molar teeth.

Question 4

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

Accepted Answer

Nickel-titanium (NiTi)

Answer

Nickel-titanium wire has superior elastic memory and delivers light, continuous forces ideal for the initial alignment phase of treatment.

Question 5

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

Accepted Answer

0.009 inch

Answer

0.009-inch stainless steel ligature wire is the standard gauge used to cinch archwires into bracket slots.

COA - Certified Orthodontic Assistant Practice Test