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Orthodontics Flashcards

7 cards from real MJDF practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Orthodontics flashcards as text

  1. Which type of orthodontic tooth movement involves the entire tooth, including the root apex, moving in the same direction without tipping?

    Answer: Bodily (translation) movement

    Bodily movement (translation) requires the crown and root apex to move equally in the same direction, requiring a force couple and being the most demanding biomechanically.

  2. Current best evidence regarding the duration of orthodontic retention after fixed appliance therapy recommends:

    Answer: Indefinite retention

    Current evidence supports indefinite retention, as relapse can occur many years post-treatment and no predictable safe end-point for cessation has been established.

  3. Which force type is considered optimal for efficient orthodontic tooth movement with minimal tissue damage?

    Answer: Light continuous force

    Light continuous forces optimise bone remodelling via sustained periodontal ligament stimulation without causing hyalinisation or undermining resorption.

  4. The Hawley retainer is best classified as which type of orthodontic appliance?

    Answer: Removable retainer

    The Hawley retainer is a removable appliance comprising an acrylic baseplate and labial bow, widely used for post-treatment retention.

  5. Extraoral anchorage in orthodontics refers to:

    Answer: Using structures outside the oral cavity such as the head or neck to reinforce anchorage

    Extraoral anchorage involves headgear attached to the head or neck to provide force resistance or to redirect growth, supplementing intraoral anchorage.

  6. A hyperdivergent skeletal facial pattern is characterised by:

    Answer: Increased lower facial height and a steep mandibular plane angle

    Hyperdivergent patients have a steep mandibular plane angle and increased lower facial height, often associated with anterior open bite tendency.

  7. The primary mechanism by which functional appliances achieve their effect is:

    Answer: Redirecting condylar growth by posturing the mandible forward

    Functional appliances hold the mandible in a protrusive position, transmitting muscle and stretch forces to stimulate adaptive condylar growth and dental compensation.