COA COA Orthodontic Materials & Equipment 3

Question 1

What is the primary purpose of an orthodontic band?

Accepted Answer

To fit around posterior teeth to anchor appliances and archwires

Answer

Orthodontic bands are stainless steel rings cemented around posterior teeth to serve as stable anchorage units for appliances.

Question 2

Which orthodontic pliers are best suited for forming loops and bends in archwires?

Accepted Answer

Bird beak (139) pliers

Answer

Bird beak pliers have conical and flat beaks that allow precise loop formation and step bends in orthodontic archwires.

Question 3

What is the purpose of elastomeric power chain in orthodontic treatment?

Accepted Answer

To close spaces between teeth

Answer

Power chain is a continuous series of connected elastic rings that applies sustained force to close residual spaces between teeth.

Question 4

Which bracket material provides the best esthetics but generates more friction than metal brackets?

Accepted Answer

Ceramic

Answer

Ceramic brackets closely match tooth color for superior esthetics but exhibit higher friction coefficients than metal brackets.

Question 5

What is the function of a torquing auxiliary wire in orthodontics?

Accepted Answer

To correct root torque when standard bracket prescription is insufficient

Answer

A torquing auxiliary is an additional wire segment inserted to apply precise torque forces and correct root axial inclination.

COA - Certified Orthodontic Assistant Practice Test