Pacific Coast Society of Orthodontists Bulletin Spring 2023 - 48

Case Report
Table 1. Pretreatment (When Transferred)
Cephalometric Measurements
Cephalometric
Measurement
SNA (°)
SNB (°)
ANB (°)
Norm Pretreatment
82.0
80.0
2.0
FMA (FH-MP) (°) 25.0
SN-MP (°)
U1-NA (mm)
U1-SN (°)
L1-NB (mm)
IMPA (L1-MP)
(°)
Upper lip to
E-line (mm)
Lower lip to
E-line (mm)
32.0
4.0
104.0
4.0
90.0
−4.0
−2.0
83.5
79.0
4.5
32.1
34.5
3.2
102.9
6.2
90.0
1.9
−0.9
the distal portion of the root of tooth #7, just
apical to the crest of the alveolar bone. Upon
further evaluation, it was deemed to be a
supernumerary tooth positioned lingually to
tooth #7 and was extracted prior to the beginning
of orthodontic treatment (Figure 3).
The cephalometric analysis revealed an
orthognathic maxilla (SNA, 83.5°) and mandible
(SNB, 79.3°). However, with SNA being
increased compared with the norm and SNB
decreased, there was an increased ANB (ANB,
4.2°), indicating a skeletal discrepancy. He
presented with a hyperdivergent skeletal pattern
(MP-SN, 34.5°) and retrusive chin button
(Pog-N-perp, −11.8 mm). Dentally, both his
maxillary and mandibular incisors were well
positioned. His upper was retrusive (upper
lip-E line, −0.9 mm) while his lower lip was
protrusive (lower lip-E line, 1.9 mm) in relation
to the E-line (Figure 3, Table 1).
The American Board of Orthodontics (ABO)
Discrepancy Index Score of this case was 10
(Figure 4).
Figure 3. Pretreatment panoramic radiograph (left) and lateral cephalogram (right)
Figure 4. ABO discrepancy index score
48
PCSO Bulletin Spring 2023

Pacific Coast Society of Orthodontists Bulletin Spring 2023

Table of Contents for the Digital Edition of Pacific Coast Society of Orthodontists Bulletin Spring 2023

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