Pacific Coast Society of Orthodontists Bulletin Fall 2019 - 45

Case Report

maxillary left lateral incisor is higher than the
adjacent teeth. No functional shift is detected
during clinical examination. Overall, the patient
has good oral hygiene (Figures 1 and 2).
Lateral cephalometric analysis (Table 1) shows a
skeletal Class I and hypodivergent pattern (ANB,
1.6°; SN-MP, 24.2°; and FMA, 13.9°) and proclined

maxillary incisors (U1-SN, 113.2°). The patient is
in cervical vertebral maturation stage 4; hence,
it is estimated that her mandibular peak growth
might have occurred within the previous one to
two years (Figure 3A). The posteroanterior cephalometric radiograph shows that the occlusal
plane cants down on the right side. In addition,
with asymmetric mandibular growth, her chin

Figure	2. Initial
digital models

Table 1. Initial Lateral and Cephalometric Measurements
Variable

Norm

Pretreatment

SNA (°)

82.0

87.0

SNB (°)

80.0

85.4

ANB (°)

2.0

1.6

FMA (FH-MP) (°)

25.0

13.9

SN-MP (°)

32.0

24.2

4.0

4.5

102.0

113.2

4.0

3.7

IMPA (L1-MP) (°)

95.0

92.7

Upper lip-E line (mm)

-4.0

-1.7

Lower lip-E line

-2.0

-1.0

U1-NA (mm)
U1-SN (°)
L1-NB (mm)

Fall	2019	 	 PCSO	Bulletin	

Figure	3. Initial lateral (A) and posteroanterior (B)
cephalograms as well as panoramic view (C); all
were generated from the cone-beam computed
tomography (CBCT) scan

45



Pacific Coast Society of Orthodontists Bulletin Fall 2019

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