Objectives
This study aimed to compare preoperatively predicted rotational relapse with actual
post-treatment mandibular position after mandibular setback surgery via the surgery-first
approach and to evaluate the effect of the increase of vertical dimension (VD) on
surgical occlusion and the amount of mandibular setback on postoperative mandibular
positional changes.
Study Design
Twenty-nine patients who underwent bilateral sagittal split ramus osteotomy for mandibular
prognathism were evaluated by using lateral cephalograms, which had been obtained
preoperatively, immediately postoperatively, and immediately after debonding. Increase
of VD on surgical occlusion was measured preoperatively. We estimated the mandibular
forward movement resulting from the postoperative mandibular anticlockwise rotation
during postoperative orthodontic treatment and compared it with the actual post-treatment
mandibular position.
Results
The actual postoperative mandibular forward movement (2.1 mm) was significantly greater
compared with the forward movement (1 mm) predicted preoperatively (P < .01). The postoperative mandibular forward movement was greater in the groups with
greater VD increase (>1.5 mm) or greater mandibular setback (>10 mm), even though
there was no statistically significant difference.
Conclusions
These results suggest that additional postoperative relapse may occur with mandibular
rotational relapse, and VD increase and the amount of mandibular setback may affect
post-treatment mandibular position in surgery-first orthodontic treatment.
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Article info
Publication history
Published online: July 30, 2016
Accepted:
July 23,
2016
Received in revised form:
May 26,
2016
Received:
February 25,
2016
Footnotes
This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP 2011-0030121).
Identification
Copyright
© 2016 Elsevier Inc. All rights reserved.
