Pacific Coast Society of Orthodontists Bulletin Summer 2022 - 52

Case Report
Table 1. Pretreatment Cephalometric
Measurements
Cephalometric
Measurement
SNA (°)
SNB (°)
ANB (°)
Wits (mm)
FMA (FH-MP) (°)
SN-MP (°)
U1-NA (mm)
U1-SN (°)
L1-NB (mm)
IMPA (L1-MP) (°)
Norm Pretreatment
82.0
80.0
2.0
0.0
25.0
32.0
4.0
104.0
4.0
90.0
Upper lip to E line (mm) −4.0
Lower lip to E line (mm) −2.0
86.2
82.2
4.0
-2.2
19.9
32.7
6.8
114.8
11.5
107.6
2.1
4.4
Class II on the left. Other than the full restoration
on the endodontically treated maxillary left first
molar, the patient did not present as heavily
restored and exhibited excellent hygiene. Analysis
of the dental casts confirmed the intraoral
findings. The maxillary arch was constricted and
narrow, with an intercanine width of 35.7 mm
and an intermolar width of 49.5 mm (Figure 2).
Radiographic Findings
Evaluation of the CBCT 3D imaging revealed
a maxillary basal deficiency of about 4 mm as
compared with the mandibular basal bone. The
cephalometric analysis showed a moderate
skeletal Class II relationship (ANB, 4.0°) and a
normal mandibular plane angle (MP-SN, 32.7°),
with moderately proclined maxillary incisors
(U1-NA, 6.8 mm, and U1-SN, 114.8°) and severely
proclined mandibular incisors (L1-NB, 11.5 mm,
and IMPA [L1-MP], 107.6°), resulting in an acute
interincisal angle (U1-L1, 104.9°; Figure 3; Table
1). The ABO Difficulty Index was scored as 27
(Figure 4).
Figure 4. ABO discrepancy index score
52
PCSO Bulletin Summer 2022

Pacific Coast Society of Orthodontists Bulletin Summer 2022

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