Orthodontic Biomechanics Flashcards
7 cards from real ABO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Orthodontic Biomechanics flashcards as text
Which appliance design maximizes anchorage by grouping multiple teeth together?
Answer: Reinforced/reactive anchorage with multiple bonded teeth
Adding more teeth (and roots) to the anchorage unit distributes reactive force and resists unwanted movement.
A temporary anchorage device (TAD) provides what type of anchorage?
Answer: Absolute (skeletal) anchorage with minimal reactive movement
TADs anchor into bone, delivering near-absolute anchorage without relying on other teeth as reaction units.
Newton's third law is relevant to orthodontics because:
Answer: Every applied force produces an equal and opposite reactive force on the anchorage
The reactive force acts on the anchorage unit, which is why anchorage control is essential.
Differential anchorage in extraction cases relies on the principle that:
Answer: Larger anchorage units move less than the units being retracted
By making the anchorage segment larger, it resists movement while lighter segments are retracted more readily.
A transpalatal arch is commonly used to:
Answer: Reinforce posterior anchorage and control molar position
The transpalatal arch links the molars across the palate, adding anchorage and controlling molar rotation/width.
Which of the following would MOST likely cause anchorage loss?
Answer: Applying heavy retraction forces against a small anchorage unit
Heavy forces against inadequate anchorage cause the anchor teeth to move forward, i.e., anchorage loss.
Headgear delivers anchorage and force by:
Answer: An extraoral appliance applying force to restrain or move maxillary molars
Headgear uses extraoral support to restrain maxillary growth or distalize molars without loading other teeth.