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
According to Angle's classification, Class II Division 1 malocclusion is characterised by which of the following?
Answer: Proclined upper incisors with increased overjet
Class II Division 1 features a distal molar relationship with proclined upper incisors and characteristically increased overjet.
What is the normal ANB angle in a balanced skeletal relationship as measured on a lateral cephalogram?
Answer: 2–4°
The normal ANB angle is 2–4°, reflecting a typical forward position of the maxilla relative to the mandible.
The lower incisor to mandibular plane angle (IMPA) has a UK mean value of approximately:
Answer: 93°
The UK mean IMPA is approximately 93° (±6°), reflecting the normal proclination of lower incisors relative to the mandibular plane.
Which index is used within the NHS in the UK to assess a patient's eligibility for orthodontic treatment?
Answer: Index of Orthodontic Treatment Need (IOTN)
The IOTN grades dental health and aesthetic components and is the standard used by the NHS to determine whether patients qualify for funded orthodontic care.
During which stage of dental development is interceptive orthodontic treatment most commonly initiated?
Answer: Mixed dentition stage
The mixed dentition stage is the optimal window for interceptive treatment, allowing early correction before all permanent teeth have erupted.
A Class III skeletal relationship is best described by which cephalometric finding?
Answer: ANB angle of 0° or less
A Class III skeletal pattern is identified by an ANB angle of 0° or below, indicating mandibular prominence relative to the maxilla.
What does the Bolton analysis assess in orthodontic treatment planning?
Answer: Tooth size discrepancy between the upper and lower dental arches
The Bolton analysis compares the sum of mesiodistal widths of upper and lower teeth to identify tooth size discrepancies that would prevent ideal occlusion.