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OP 142
aBSTracTS OP 14
Title
PREDICTAbILITy OF IAN ATTACHMENT TO buCCAL PLATE IN SSRO bASED ON CbCT DATA
Authors
C. POLITIS 1 , J. OLuGbAJE, y. SuN, S. SCHEPERS, L. VRIELINCK, I. LAMbRICHTS
Affiliations
1 Uhasselt, Dept. Morphology, Hasselt, BELGIUM, 2 ZOLGENK, Dept. Oral and Maxillofacial Surgery,
Genk, BELGIUM, 3 ZOL GENK, Genk, BELGIUM, 4 ZOL GENK, Genk, BELGIUM, 5 UHasselt,
Dep Morphology, Hasselt, BELGIUM
Body
The detachment of IAN canal from the proximal segment of the mandible is a delicate manuover,
which frequently involved manipulation and pressure on the neurovascular bundle.
In these instances, the IAN is more prone to injury during the surgical SSO and as a result,
neurosensory disturbances of the IAN may occur in these patients. The purpose of the study
is to know whether CBCT is able to predict the attachment of the neurovascular bundle to
the proximal segment of the mandible during sagittal split osteotomy and to identify other
predictive factors. The predictive ability of the different distances was assessed by means of
a logistic generalized estimating equations (GEE) model (Liang and Zeger, 1986) taking into
account the correlation between the outcomes on both sides from one patient. In addition to
the 7 measurements, the following confounding factors were added to the model: gender, age,
type of movement (advancement, set-back and rotation) and side. The analysis includes 440
operation sites (OPS) from 220 subjects (141 females, 79 males). BSO advancement was done in
150 subjects while Rotation and Setback were done in 53 and 17 subjects respectively. In more
than one-third of operation sites (170 sites; 98 sites in female, 72 sites in male) nerve was attached
to the proximal segment of mandible. Of these group over 65 % (108 sites) of attached
nerves required surgical intervention to free them from mandible while freer was used in less
than 35% (62 sites)
Keywords
sagittal split osteotomy, cbct, inferior alveolar nerve
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