COA Orthodontic Materials & Equipment Flashcards
6 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 COA Orthodontic Materials & Equipment flashcards as text
Which bracket design features a built-in clip that holds the archwire without separate ligatures?
Answer: Self-ligating bracket
Self-ligating brackets have an integrated gate or clip mechanism that secures the archwire, reducing friction and appointment time.
From what materials are modern orthodontic archwires most commonly fabricated?
Answer: Stainless steel or nickel-titanium
Modern archwires are predominantly made from stainless steel for rigidity or nickel-titanium for flexibility and memory.
What is the primary function of a Nance appliance?
Answer: To prevent upper molars from drifting mesially
A Nance appliance is a fixed space maintainer that uses an acrylic button on the palate to prevent upper molars from moving forward.
Which retainer type is fabricated from clear thermoplastic material that fits over the teeth?
Answer: Essix retainer
An Essix retainer is vacuum-formed from clear thermoplastic, providing an esthetic and removable retention option.
Which instrument is specifically designed to place and remove elastomeric o-tie ligatures on brackets?
Answer: Ligature director/tucker
A ligature director (tucker) has a small hook tip designed to seat and remove elastic o-ties around bracket wings efficiently.
Which instrument is used to trim the excess distal end of an archwire after engagement?
Answer: Distal end cutter
A distal end cutter is designed to cut flush the excess archwire extending past the terminal bracket, preventing soft tissue irritation.