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
A patient presents with a mandible positioned posteriorly and a convex profile. Which skeletal classification does this most likely represent?
Answer: Skeletal Class II
A retrognathic mandible with a convex profile is characteristic of a skeletal Class II relationship.
On a lateral cephalogram, the ANB angle measures 7 degrees. What does this indicate?
Answer: Skeletal Class II tendency
An ANB angle greater than about 4 degrees suggests a skeletal Class II discrepancy.
Which radiograph is most appropriate for evaluating impacted canine position in three dimensions?
Answer: Cone-beam CT (CBCT)
CBCT provides three-dimensional localization of impacted teeth and adjacent root resorption.
The Bolton analysis is used primarily to assess what?
Answer: Tooth size discrepancy between arches
Bolton analysis compares the mesiodistal tooth-size ratio of maxillary to mandibular teeth to detect discrepancies.
A negative value on space analysis in the mandibular arch indicates:
Answer: Arch length deficiency (crowding)
A negative discrepancy means available arch length is less than required, indicating crowding.
Which cephalometric measurement best evaluates the vertical growth pattern?
Answer: Mandibular plane angle (FMA)
The mandibular plane angle reflects the vertical facial growth pattern, with high angles indicating hyperdivergence.
A patient with an anterior open bite and tongue thrust should first be evaluated for:
Answer: Underlying etiology such as habit or skeletal pattern
Identifying the cause—habitual, skeletal, or functional—is essential before selecting open-bite treatment.