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Soft tissue changes associated with incisor decompensation prior to orthognathic surgery
A Phonpraserth1, S J Cunningham, N P Hunt
1Department of Orthodontics, Eastman Dental Institute, University of London, United Kingdom.
The International Journal of Adult Orthodontics and Orthognathic Surgery
|February 25, 2000
Summary
Incisor decompensation before orthognathic surgery impacts soft tissues differently across malocclusion types. Class II division 2 patients showed the least soft tissue change, possibly due to tissue tone or distance from teeth.
Area of Science:
- Dentistry
- Orthodontics
- Cephalometrics
Background:
- Incisor decompensation is a critical step before orthognathic surgery.
- Understanding soft tissue response to dental changes is vital for predictable surgical outcomes.
Purpose of the Study:
- To evaluate soft tissue changes following incisor decompensation in patients undergoing orthognathic surgery.
- To compare these changes across different malocclusion groups (Class II division 1, Class II division 2, and Class III).
Main Methods:
- Retrospective cephalometric analysis using angular and linear measurements.
- Digitization of radiographs from subjects grouped by malocclusion.
- Calculation of the soft tissue change to dental change ratio.
Main Results:
- Incisor decompensation was more pronounced in Class II division 2 and Class III patients.
- Mandibular incisor inclination changes in Class II division 1 were unexpected.
- Class II division 2 patients exhibited the lowest soft tissue response to dental changes.
Conclusions:
- Soft tissue response to incisor decompensation varies significantly with malocclusion type.
- Increased soft tissue tone or distance from the dentition may explain the minimal changes in Class II division 2 patients.
- Findings highlight the complex interplay between dental movements and soft tissue adaptation in orthognathic surgery planning.