Pacific Coast Society of Orthodontists Bulletin Spring 2021 - 38

Case Report

Table 1. Pretreatment Cephalometric Measurements
Variable

Norm Pretreatment

SNA (°)

82.0

80.0

SNB (°)

80.0

76.0

ANB (°)

2.0

4.0

FMA (FH-MP) (°)

25.0

28.0

SN-MP (°)

32.0

28.0

4.0

0.0

104.0

87.0

4.0

2.0

90.0

93.0

Upper lip-E line (mm) −4.0

−5.0

Lower lip-E line (mm) −2.0

−4.0

U1-NA (mm)
U1-SN (°)
Figure 3. Initial panoramic radiograph and lateral cephalogram
good oral hygiene and no signs of recession
(Figures 1 and 2). Her temporomandibular
joints are within normal limits with no signs
of pain.
Radiographic Findings
The pretreatment panoramic radiograph
shows that both condyles appear symmetric
and round. Sufficient alveolar bone support
is present in both the maxillary and mandibular arches. Primary teeth A, C, H, and J are

38	

present. The maxillary right second premolar is erupting mesially, and the distal roots
of A and J are still present; both maxillary
canines are impacted and are partially overlapping the roots of the maxillary central
incisors, with more overlap noted on the
maxillary left central incisor. All third molars
are present and developing.
From the lateral cephalogram, the patient
presents mild skeletal Class II with deep

L1-NB (mm)
IMPA (L1-MP) (°)

bite, characterized by a retrognathic mandible (ANB = 4°, SNB = 76°) and a hypodivergent mandibular plane angle (SN-MP =
28°). The maxillary incisors are retroclined
(U1-SN = 87°), and the mandibular incisors
are well positioned (L1-MP = 93°; Figure 3;
Table 1).

PCSO Bulletin    Spring 2021



Pacific Coast Society of Orthodontists Bulletin Spring 2021

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