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Horizontal changes in the condylar head
Oral and maxillofacial surgery
Horizontal changes in the condylar head after sagittal split ramus osteotomy
with bent plate fixation
Koichiro Ueki DDS, PhDa, , , Kagan Degerliyurt DDSa, b, Yukari Hashiba DDSa,
Kohei Marukawa DDS, PhDa, Kiyomasa Nakagawa DDS, PhDa
and Etsuhide Yamamoto DDS, PhDa
aDepartment of Oral and Maxillofacial Surgery, Graduate School of Medicine,
Kanazawa University, Kanazawa, Japan bDepartment of Oral and Maxillofacial
Surgery, School of Dentistry, Gazi University, Ankara, Turkey
Objective
The purpose of this study was to evaluate the horizontal changes in the
condylar head with bent plate fixation after sagittal split ramus osteotomy
(SSRO) with and without a Le Fort I osteotomy.
Study design
Of 47 Japanese patients with mandibular prognathism, 24 underwent SSRO and
23 underwent SSRO in combination with a Le Fort I osteotomy. A 3–5-mm gap
was made between the proximal and distal segments, and a bent plate was
fixed with 4 screws in each side of the mandible. The angle of the condylar
long axis, as well as the anteroposterior and mediolateral displacement of
the condylar head were assessed preoperatively and postoperatively by
computerized tomography (CT).
Results
There was no significant difference in reduction in mandibular length
between SSRO alone and SSRO with Le Fort I on the axial view of a
3-dimensional CT. There were no significant differences between pre-
and postoperative horizontal changes in the condylar long axis or in the
anteroposterior and mediolateral displacement of the condylar head, although
the length of the proximal segment in SSRO with Le Fort I osteotomy was
significantly shorter than in SSRO alone (P < .05).
Conclusion
These results suggest that the use of a bent plate for SSRO does not change
preoperative angle or position significantly in setback surgery, regardless
of the addition of Le Fort I osteotomy.
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