ABO Growth and Development Flashcards
6 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 6 ABO Growth and Development flashcards as text
The primary site of mandibular growth that contributes most to mandibular lengthening in adolescents is:
Answer: Condylar cartilage (endochondral growth at the condyle)
The condylar cartilage undergoes endochondral ossification, adding new bone to the posterior-superior condyle and lengthening the mandible.
Normal primary (deciduous) dentition eruption begins with which tooth?
Answer: Lower central incisor
The mandibular central incisors are typically the first primary teeth to erupt, at approximately 6–10 months of age.
The 'ugly duckling stage' of dental development is characterized by:
Answer: Spacing and flaring of upper central incisors due to erupting lateral incisor and canine crowns
As the maxillary lateral incisors and canines erupt, their follicles push the central incisor roots together, causing temporary crown flaring and midline diastema.
Which of the following is a normal finding in the early mixed dentition that does NOT require orthodontic intervention?
Answer: Mild crowding due to tooth-size/arch-size discrepancy that may self-correct
Mild crowding in the early mixed dentition can resolve naturally as the leeway space is utilized during the transition to permanent teeth.
The 'leeway space' in the mixed dentition refers to the size difference between:
Answer: The combined primary canine and molars versus the combined permanent canine and premolars
Leeway space is the difference in combined mesiodistal widths of primary canines/first/second molars minus permanent canines/first/second premolars (approximately 1.5 mm upper, 2.5 mm lower per side).
Eruption of the permanent first molars into a flush terminal plane primary dentition most commonly results in which permanent molar relationship?
Answer: End-to-end permanent molar relationship initially, typically resolving to Class I
A flush terminal plane leads to end-to-end first molar eruption; Class I is then achieved through differential leeway space utilization (lower more than upper) and late mesial shift.