Articles Tập 67 Số CĐ15 25/09/2026

CEPHALOMETRIC TISSUE CHARACTERISTICS OF SKELETAL CLASS III MALOCCLUSION PATIENTS INDICATED FOR SURGERY

Tran Thi Bich Van
DOI: 10.52163/yhc.v67iCD15.6798
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Abstract

Objectives: To describe the hard and soft tissue cephalometric characteristics of patients with skeletal Class III malocclusion indicated for orthognathic surgery.

Methods: A descriptive cross-sectional study was conducted on 137 post-growth patients diagnosed with skeletal Class III malocclusion requiring surgical intervention. Lateral cephalograms were traced and analyzed using SmartCeph software.

Results: The mean age was 23.9 ± 4.2 years, with females accounting for 62.8%. The prominent skeletal feature was severe mandibular prognathism, evidenced by a mean SNB angle of 85.56° ± 2.46°, chin prominence of 9.53 ± 6.27 mm, a Wits appraisal of -13.25 ± 3.66 mm, and a negative ANB angle of -3.17° ± 2.30°. Significant dentoalveolar compensation was observed, with an increased U1-NF angle (122.13° ± 5.73°) and decreased L1-MP angle (82.46° ± 6.46°). The magnitude of these discrepancies vastly exceeds the envelope of conventional orthodontic tooth movement.

Conclusions: The structural deviations in this patient cohort are severe, exceeding the physiological limits of dentoalveolar compensation, thereby confirming the absolute necessity of orthognathic surgical intervention.

Keywords
Class III malocclusion, orthognathic surgery, lateral cephalogram.
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