Objective
This study aimed to evaluate postoperative changes in the condyle after unilateral
sagittal split ramus osteotomy (USSRO) and to compare them with changes occurring
after bilateral sagittal split ramus osteotomy (BSSRO).
Study Design
For 50 condyles from 25 patients, positional and volumetric changes of condyle were
analyzed by using computed tomography images taken before, immediately after, and
6 months after surgery and compared between the USRRO and BSSRO groups.
Results
The condyle showed lateral and inferior displacement immediately after surgery and
medial and superior movement at 6 months after surgery in the USSRO and BSSRO groups.
No statistically significant difference was found between the 2 groups in the time-course
positional change and rotation of the condyle. In the comparison of bodily shift and
rotation between operated and nonoperated sides in USSRO group, there were no significant
differences between the 2 sides, except for the perioperative rotation pattern on
the coronal plane. At 6 months after surgery, the changed volume relative to preoperative
condylar volume was only 5.2% in the USSRO group and 2.7% in the BSSRO group.
Conclusions
The findings from this study suggest that USSRO can be used effectively in appropriately
selected patients; however, temporomandibular joint (TMJ) problems may arise when
condylar displacement is excessive enough to exceed physiologic tolerances.
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Article info
Publication history
Published online: July 13, 2020
Accepted:
June 11,
2020
Received in revised form:
April 17,
2020
Received:
December 9,
2019
Identification
Copyright
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