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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. The most common reason for prolonged retention of a primary tooth beyond its normal exfoliation date is:

    Answer: Absence of the permanent successor

    Hypodontia (absence) of the permanent successor removes the normal eruptive pressure that drives primary tooth exfoliation, leading to its retention.

  2. External apical root resorption during orthodontic treatment is most strongly associated with:

    Answer: Heavy forces, prolonged treatment, and intrusion movements

    Heavy forces, lengthy treatment duration, and intrusive tooth movements place the greatest stress on root apices and are the strongest risk factors for external apical root resorption.

  3. In a 10-year-old patient with a palatally displaced upper permanent canine, what is the first-line interceptive management?

    Answer: Extraction of the retained primary canine

    Extraction of the retained primary canine at age 10–11 can redirect the ectopic canine and achieve spontaneous eruption in approximately 64–78% of cases, avoiding surgery.

  4. The Twin Block appliance is primarily indicated for the treatment of which malocclusion?

    Answer: Class II Division 1 malocclusion during the growth phase

    The Twin Block is a two-part removable functional appliance designed to posture the mandible forward, correcting Class II Division 1 malocclusion during active growth.

  5. Point A (Subspinale) on a lateral cephalogram represents:

    Answer: The deepest point on the concavity of the anterior maxilla

    Point A is the deepest point on the concavity of the anterior surface of the maxilla and is used in the ANB analysis to represent the anteroposterior position of the maxilla.

  6. The normal values for overjet and overbite in Class I occlusion are approximately:

    Answer: Overjet 2–4 mm, Overbite 2–4 mm

    Normal Class I occlusion has an overjet of 2–4 mm and an overbite of 2–4 mm, reflecting typical anteroposterior and vertical incisor relationships.

  7. Class II Division 2 malocclusion is most characteristically associated with which combination of features?

    Answer: Retroclined upper central incisors, deep overbite, and increased curve of Spee

    Class II Division 2 is distinguished by retroclined upper central incisors, a markedly deep overbite, and an increased curve of Spee, often on a mild Class II or Class I skeletal base.