Abstract
The aims of this cohort study were to compare the mandibular morphology between patients
with Robin sequence (RS) and controls, and to examine the effects of mandibular distraction
osteogenesis (MDO) using different vectors. Measurements of the mandibles of 80 patients
with RS and 46 controls aged< 90 days were made using computed tomography. The data
were compared among isolated RS patients (n = 58), syndromic RS patients (n = 22), and controls. Patients with RS exhibited significantly shorter ramus and body lengths
and larger symphyseal angles than controls (all P < 0.001). Patients with isolated RS had shorter body lengths (P < 0.001), while syndromic patients had shorter ramus and body lengths (both P < 0.001) than controls. Seventy RS patients underwent MDO. Pre-MDO (n = 37) and post-MDO (n = 29) mandibular measurements were compared between patients undergoing MDO with
a vertical vector and those undergoing MDO with a horizontal vector. Polysomnography
data from part of the cohort highlighted the effectiveness of both vectors. MDO with
a horizontal vector conferred 11% and 36% increases in ramus and body length, respectively,
while these increases were 34% and 27.5%, respectively, with a vertical vector. MDO
with a vertical vector was effective in lengthening ramus and body components and
should be considered in the presence of ramus hypoplasia.
Keywords
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Article info
Publication history
Published online: August 17, 2022
Accepted:
July 21,
2022
Identification
Copyright
© 2022 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.
