Assessment of orbital volume in frontofacial advancements.
OBJECTIVE
The objective of this study was to evaluate the variation of the orbital volume and the correlation with the magnitude of craniofacial advances as well as demonstrate its effectiveness through comparisons with normal levels of orbital volumes.


BACKGROUND
Syndromic craniofacial synostosis is characterized by cranial morphological alterations and hypoplasia of the midface that may result in obstructive sleep apnea and exorbitism; these effects are indications of surgical treatment. The gradual advancement of tissues is the surgical treatment to correct accentuated exorbitisms and jaw retrusions.


METHODS
This was a retrospective study by review of medical records and tomographic examinations of 20 patients submitted to distraction osteogenesis between 2001 and 2012, who were divided into 2 groups: groups MB and LF with 11 and 9 patients, who underwent frontofacial or Le Fort III osteotomy. The orbit volume was measured with the InVesalius and Magics software, and facial advancements with Rhinoceros software. Statistical analyses were conducted using Student t test and analysis of variance.


RESULTS
Patients' ages ranged from 6 to 29 years. Group MB showed an increase of 8.94 and 9.84 mm(3) in the right and left orbit volume variation, whereas group LF presented 5.70 and 5.77 mm(3). The average advancements in the right and left orbits were 11.36 ± 3.80 and 11.11 ± 3.45 mm in group LF, respectively, and 14.22 ± 4.12 and 14.48 ± 4.49 mm in group MB.


CONCLUSIONS
Exorbitism was satisfactorily treated. The correlation was proportional in group LF and group MB. There was normalization of orbital volume compared with normal levels of orbital volumes.
*Craniofacial Surgery Unit, Division of Plastic Surgery, University of São Paulo Medical School, São Paulo †Centre for Information Technology Renato Archer, Campinas, São Paulo, Brazil.
Rodrigo Badotti
RB
Antunes
Anderson Aparecido
AA
Camilo
Airton Moreira
AM
da Silva
Jorge Vicente Lopes
JV
da Silva
Nivaldo
N
Alonso
D000293:Adolescent; D000328:Adult; D003394:Craniofacial Dysostosis / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D009915:Orbit / Q000000981:diagnostic imaging* / Q000601:surgery; D009929:Organ Size; D019340:Osteotomy, Le Fort / Q000379:methods*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult