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Issue: Vol. 562 No. 3 (2026)
Section: Các bài báo
DOI: 10.51298/vmj.v562i3.18663
Date Published: 13/08/2026
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Lê, T. H., Trần, Á. K., Nguyễn, M. H., & Nguyễn, H. K. (2026). SOFT-TISSUE MORPHOLOGY AFTER MANDIBULAR SETBACK BSSO COMBINED WITH ADVANCEMENT GENIOPLASTY IN PATIENTS WITH SKELETAL CLASS III MALOCCLUSION. Vietnam Medical Journal, 562(3). https://doi.org/10.51298/vmj.v562i3.18663

SOFT-TISSUE MORPHOLOGY AFTER MANDIBULAR SETBACK BSSO COMBINED WITH ADVANCEMENT GENIOPLASTY IN PATIENTS WITH SKELETAL CLASS III MALOCCLUSION

Tấn Hùng Lê1, , Ái Khiêm Trần2, Mỹ Huyền Nguyễn1, Hoàng Khang Nguyễn1
1 Trường Y dược, Đại học Trà Vinh
2 Trường Đại học Quốc tế Hồng Bàng

Main Article Content

Abstract

Objective: To describe changes in lower facial soft-tissue morphology and determine soft-tissue-to-hard-tissue response ratios following mandibular setback bilateral sagittal split osteotomy (BSSO) combined with advancement genioplasty in patients with skeletal Class III malocclusion.


Methods: This longitudinal descriptive study included 36 patients. Lateral cephalometric radiographs were obtained before surgery (T0), immediately after surgery (T1), and 6 months postoperatively (T2). Changes in hard-tissue and soft-tissue landmarks and lip–chin measurements were evaluated in the anteroposterior and vertical dimensions.


Results: At 6 months, the soft-tissue landmarks Stoi, Li, B′, Pg′, and Me′ showed significant anteroposterior changes (p < 0.05). The B–B′, Pg–Pg′, and Me–Me′ distances decreased significantly, with the greatest reduction observed at Pg–Pg′. The anteroposterior soft-tissue-to-hard-tissue response ratios at B′/B, Pg′/Pg, and Me′/Me were 82.4%, 60.2%, and 88.8%, respectively. The corresponding vertical response ratios were 93.9%, 81.0%, and 83.8%.


Conclusion: Chin soft tissues changed in response to the underlying hard-tissue movements, although the magnitude of response varied among anatomical landmarks. These response ratios may support postoperative soft-tissue prediction and orthognathic surgical planning.

Keywords

bilateral sagittal split osteotomy, advancement genioplasty, skeletal Class III malocclusion

Article Details

References

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