Related Experiment Video
Updated: Sep 29, 2025
05:54
Real-Time Dynamic Navigation System for the Precise Quad-Zygomatic Implant Placement in a Patient with a Severely Atrophic Maxilla
Published on: October 18, 2021
1.9K
Changes in Facial Profile after Modified Anterior Maxillary Subapical Osteotomy
Chun-Ming Chen1,2, Szu-Ting Chou2,3, Shih-Chieh Chen3
1Department of Oral and Maxillofacial Surgery, Kaohsiung Medical University, Kaohsiung 80708, Taiwan.
Journal of Personalized Medicine
|March 25, 2022
Summary
Modified anterior maxillary subapical osteotomy (AMSO) effectively retracts both hard and soft tissues in bimaxillary protrusion cases. This procedure significantly improves facial profiles and increases the nasolabial angle, offering a safer alternative with better outcomes.
Area of Science:
- Orthodontics and Maxillofacial Surgery
- Craniofacial Anatomy and Biomechanics
- Surgical Innovation in Orthognathic Procedures
Background:
- Bimaxillary protrusion presents challenges in achieving ideal facial aesthetics.
- Anterior maxillary subapical osteotomy (AMSO) is a surgical technique used to address these issues.
- Modifications to AMSO aim to improve surgical outcomes and patient safety.
Purpose of the Study:
- To evaluate the effects of a modified anterior maxillary subapical osteotomy (AMSO) on facial profile changes.
- To quantify the hard and soft tissue movements following the modified AMSO procedure.
- To assess the impact on the nasolabial angle (NLA) and compare outcomes with existing AMSO methods.
Main Methods:
- Cephalometric analysis of patients before and 2 months after modified AMSO.
- Measurement of hard tissue landmarks (e.g., ANS, Is) and soft tissue landmarks (e.g., Prn, Sn, Ls).
- Calculation of linear distances, angles (SNA, NLA), and soft/hard tissue ratios.
Main Results:
- Significant retraction of incisors (Is) and anterior nasal spine (ANS) by 7.3 mm and 2.3 mm, respectively.
- Substantial retraction of soft tissue landmarks (Prn, Sn, Ls) ranging from 1.2 mm to 4.4 mm.
- A significant increase in the nasolabial angle (NLA) by 7.1°, indicating improved facial profile.
Conclusions:
- Modified AMSO effectively retracts both hard and soft tissues, leading to significant facial profile changes.
- The procedure demonstrates favorable soft/hard tissue ratios, suggesting predictable outcomes.
- The modified AMSO offers advantages such as enhanced blood supply, direct visualization, and reduced complications compared to conventional methods.
