Orthodontic Diagnosis and Treatment Planning 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 Diagnosis and Treatment Planning flashcards as text
The Wits appraisal is measured by projecting points A and B onto which plane?
Answer: Functional occlusal plane
The Wits appraisal drops perpendiculars from points A and B onto the functional occlusal plane.
Which of the following is a primary indication for extraction in orthodontic treatment planning?
Answer: Severe arch length deficiency with bimaxillary protrusion
Severe crowding combined with dental protrusion often requires extraction to relieve the discrepancy.
A steep mandibular plane angle combined with a long lower facial height suggests which growth tendency?
Answer: Vertical (hyperdivergent)
High mandibular plane angle and increased lower face height indicate a hyperdivergent vertical growth pattern.
The curve of Spee is best described as:
Answer: The anteroposterior occlusal curvature seen in lateral view
The curve of Spee is the anteroposterior curvature of the occlusal plane viewed from the side.
In a growing Class II patient with a retrognathic mandible, which appliance approach is most appropriate?
Answer: Functional appliance to encourage mandibular advancement
Functional appliances harness growth to advance a deficient mandible in growing Class II patients.
A crossbite that shifts the mandible laterally on closure is classified as:
Answer: Functional (pseudo) crossbite
A lateral shift on closure indicates a functional crossbite caused by occlusal interference.
Which record is essential for evaluating the transverse dimension and posterior crossbite?
Answer: Frontal (PA) cephalogram or study models
A posteroanterior cephalogram and study models assess transverse width and posterior crossbites.