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Nasolabial Changes Following Double Jaw Surgery.

Michelle L Allar¹, Reza Movahed², Larry M Wolford³

¹Dayton, OH.

The Journal of Craniofacial Surgery

|November 7, 2019

Summary

Double jaw surgery significantly alters nasolabial anatomy. Maxillary advancement impacts nasal tip position, alar base width, and lip shape, with predictable changes based on surgical movements.

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Area of Science:

Orthognathic Surgery
Craniofacial Surgery
Plastic Surgery

Background:

Double jaw surgery, specifically Le Fort I maxillary advancement, is a common procedure for correcting skeletal discrepancies.
Understanding the resulting soft tissue changes in the nasolabial region is crucial for predicting aesthetic outcomes.

Purpose of the Study:

To analyze 3-dimensional nasolabial soft tissue alterations after double jaw surgery with maxillary advancement.
To correlate these soft tissue changes with specific underlying surgical movements.

Main Methods:

Analysis of pre- and post-surgical cone-beam computed tomography (CBCT) scans from 37 patients.
Construction of lateral cephalograms to quantify surgical movements and 3D facial imaging to measure soft tissue changes.

Main Results:

Significant changes observed in alar base width, nasal tip protrusion, upper lip length and inclination, and nasolabial angle.
Nasal tip superior displacement and increased dorsal concavity were noted.
Correlations established between surgical movements and changes in nasal tip protrusion, supratip break angle (SBA), nasolabial angle (NLA), and nasal tip elevation (NTE).

Conclusions:

Double jaw surgery with maxillary advancement demonstrably impacts nasolabial anatomy.
Predictive models were developed to estimate changes in SBA, NLA, and NTE based on surgical movements.