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Issue: Vol. 563 No. 2 (2026)
Section: Các bài báo
DOI: 10.51298/vmj.v563i2.18958
Date Published: 05/10/2026
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Downloads 19
How to Cite
Tạ, Q. H., Lê, N. T., Đặng, T. H., Đồng, N. Q., Phạm, Q. D., Dương, C. H., Phan, H. H., & Lê, H. T. A. (2026). ACCURACY OF THE MANDIBLE-FIRST APPROACH IN ORTHOGNATHIC SURGERY AT THE NATIONAL HOSPITAL OF ODONTO-STOMATOLOGY HA NOI. Vietnam Medical Journal, 563(2). https://doi.org/10.51298/vmj.v563i2.18958

ACCURACY OF THE MANDIBLE-FIRST APPROACH IN ORTHOGNATHIC SURGERY AT THE NATIONAL HOSPITAL OF ODONTO-STOMATOLOGY HA NOI

Quang Hào Tạ1, , Ngọc Tuyến Lê2, Triệu Hùng Đặng1, Ngọc Quang Đồng2, Quang Dương Phạm2, Chí Hiếu Dương2, Huy Hoàng Phan2, Hoàng Trâm Anh Lê2
1 Trường Đại học Y Hà Nội
2 Bệnh viện Răng Hàm Mặt Trung ương Hà Nội

Main Article Content

Abstract

Objective: To prospectively evaluate the surgical accuracy of bimaxillary orthognathic surgery utilizing a mandible-first sequence achieved through the application of open-source three-dimensional (3D) virtual planning software.


Subjects and Methods: A prospective case series study was conducted on three patients definitively diagnosed with skeletal Class III malocclusion. These patients underwent mandible-first bimaxillary orthognathic surgery at the National Hospital of Odonto-Stomatology in Hanoi between June 2025 and April 2026. The comprehensive data collection process encompassed the specific morphology of skeletal discrepancies, angular and planar manifestations analyzed via WebCeph software, and detailed surgical plans. Postoperative surgical accuracy was quantitatively assessed by superimposing one-week postoperative 3D imaging data onto the preoperative virtual surgical plans. A critical clinical deviation threshold of 2.0 mm was utilized to evaluate the precise positioning of the osteotomized segments.


Results: Three-dimensional superimposition analysis demonstrated that the maxilla was accurately repositioned in two of the three cases, despite being operated on secondary to the mandible. However, the third case exhibited a clinically significant deviation exceeding the established 2.0 mm threshold, which was primarily attributed to early postoperative relapse. Notably, a consistent observation across all three evaluated patients was the presence of early mandibular relapse, which predominantly manifested in the transverse dimension.


Conclusion: The implementation of a mandible-first sequence in bimaxillary orthognathic surgery yields relatively accurate postoperative outcomes. Furthermore, the integration of open-source 3D software serves as a highly effective and intuitive adjunctive tool for comprehensive surgical planning and evaluation.

Keywords

Orthognathic surgery, maxillofacial, mandible-first, open-source software, accuracy

Article Details

References

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