A study of upper airway dimensional change according to maxillary superior movement after orthognathic surgery

Yong-Il Kim; Soo-Byung Park; Jong-Ryoul Kim

doi:10.4041/kjod.2008.38.2.121

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Kim, Park, and Kim: A study of upper airway dimensional change according to maxillary superior movement after orthognathic surgery

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2008; 38(2): 121-132.

Published online: 30 April 2008

DOI: https://doi.org/10.4041/kjod.2008.38.2.121

A study of upper airway dimensional change according to maxillary superior movement after orthognathic surgery

Yong-Il Kim, DDS, MSD^a, Soo-Byung Park, DDS, MSD, PhD^b, Jong-Ryoul Kim, DDS, MSD, PhD^c

^aResident, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

^bProfessor, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

^cProfessor, Department of Oral and Maxillofacial Surgery, Pusan National University, Korea.

Corresponding author: Soo-Byung Park. Department of Orthodontics, School of Dentistry, Pusan National University, Gu-Deok-Ro 305, Seo-Gu, Busan 623-739, Korea. +82 51 240 7446; sbypark@pusan.ac.kr

Received 3 January 2008 Revised 10 March 2008 Accepted 12 March 2008

Abstract

Objective

The purpose of this study was to evaluate the upper airway dimensional change according to maxillary superior movement after orthognathic surgery and to identify the relationship between the amount of maxillary movement and upper airway dimensional changes.

Methods

The samples consisted of 24 adult patients (9 males and 15 females) who had a skeletal discrepancy and had received presurgical orthodontic treatment. They underwent Le Fort I superior impaction osteotomy and mandibular setback surgery. Cephalometric x-rays were taken at 3 stages - T0 (before orthognathic surgery), T1 (just or within 2 weeks after orthognathic surgery), T2 (6 months after surgery)

Results

1, Pharyngeal airway space (PAS (R)-nasopharynx) was decreased after surgery (T1) but recovered at 6 months after surgery; 2, Pharyngeal airway space (PAS (NL)-palatal plane) was increased after surgery and at 6 months after surgery; 3, Pharyngeal airway space (PAS (OL)-occlusal plane) was increased at T1 and was decreased at T2; 4, Soft palate thickness was increased at T1 but it became the same or thinner at T2; 5, There is no statistically significant relation between the amount of maxillary superior movement and pharyngeal airway space.

Conclusions

These findings suggested that the maxillary superior movement of about an average of 4.40 ± 1.14 mm did not affect upper pharyngeal airway space changes.

Keywords: Maxillary superior movement, Pharyngeal airway space

Figures and Tables

Fig 1

Measurements of Skeletal changes

Fig 2

Pharyngeal airway space points

Fig 3

Angular measurement

Table 1

Case selection criteria

Table 2

Descriptive patient information

Table 3

Reference points and lines (Lateral cephalogram)

Table 4

Measurements of pre-operation (T0), immediate post-op (T1) and follow-up (6 months) (T2)

SD, Standard deviation.

Table 5

Changes in pre-operation, immediate post-operation and follow-up periods

Sig, Significance; NS, not significant; ^*p < 0.05; ^†p < 0.01; ^‡p < 0.001.

Table 6

Changes in Vertical-PNS, ANS and Horizontal-PNS, ANS, B point - S-perpendicular plane after surgery

Sig, Significance; NS, not significant; ^*p < 0.05; ^†p < 0.01; ^‡p < 0.001.

Table 7

Correlation coefficient between changes of pharyngeal airway space and skeletal changes

^*p < 0.05; ^†p < 0.01; ^‡p < 0.001.

Table 8

Multiple Regression Analysis

r², coefficient of determination; ^*p < 0.001.

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