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Mid-facial skeletal and soft tissue changes after maxillary skeletal expander application: a retrospective CBCT
Arzu Alan1, Yeşim Kaya2, Kevser Sancak3
1Ankara 75th Year Oral and Dental Health Hospital, Ministry of Health, Ankara, 06230, Türkiye.
BMC Oral Health
|July 15, 2025
Summary
Maxillary skeletal expander 2 (MSE 2) treatment causes outward and downward rotation of the zygomaticomaxillary complex. This rotation leads to significant changes in mid-facial soft tissues, particularly in the nasal and paranasal regions.
Area of Science:
- Orthodontics
- Craniofacial Surgery
- Dentofacial Orthopedics
Background:
- Conventional palatal expanders show reduced efficacy due to suture resistance.
- Mini-screw-assisted rapid palatal expanders (MARPEs) offer an alternative for overcoming suture rigidity.
Purpose of the Study:
- To evaluate mid-facial soft tissue alterations.
- To assess rotational movements of the zygomaticomaxillary complex following Maxillary Skeletal Expander 2 (MSE 2) application.
Main Methods:
- Retrospective analysis of CBCT scans from 17 patients treated with MSE 2.
- Skeletal angular measurements in coronal and axial zygomatic sections.
- Linear and angular soft tissue measurements in the midsagittal plane.
Main Results:
- Outward rotation of the zygomaticomaxillary complex indicated by angle changes.
- Downward rotation of the zygomaticomaxillary complex shown by increased maxillary inclination.
- Significant increases in mid-facial heights, nasal width, and protrusion; decreased facial profile angle.
Conclusions:
- MSE 2 induces downward and outward rotation of the zygomaticomaxillary complex.
- Rotation occurs around the frontozygomatic suture area.
- Significant soft tissue modifications in paranasal and nasal regions are observed.
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