16515
document
The influence of pre- and intraoperative positioning of the condyle in the centre of the articular fossa on the position of the disc in orthognathic surgery . A magnetic resonance study . OBJECTIVE We investigated the changes in the temporomandibular joint ( TMJ ) after bilateral sagittal split osteotomy of the mandible for orthognathic surgery and the influence of positioning of the condylar process in the centre of the articular fossa before and during the operation for preventing changes in the TMJ postoperatively . STUDY DESIGN A total of 28 patients with mandibular retrognathism had bilateral sagittal split osteotomies for mandibular advancement . In one group of 14 patients ( 28 TMJ ) , the condyles were placed in the centre of the articular fossa before and during the operation , and in the other group they were not . Differences on magnetic resonance imaging ( MRI ) were calculated and the results were evaluated . RESULTS The main differences were found at maximal mouth opening . 15/28 TMJs ( 54 % ) that had not been positioned changed the position of the disc from physiological to anterior disc derangement with and without reduction postoperatively . In the 28 that had been positioned , changes were found in only 3 TMJs ( 11 % ) postoperatively . CONCLUSIONS Fixing the condylar process in the centre of the articular fossa intraoperatively before bilateral sagittal split osteotomy is a factor in preventing postoperative structural changes in the temporomandibular joint .
16516
Intervention_Surgical
pre- and intraoperative positioning of the condyle
16517
Intervention_Surgical
orthognathic surgery .
16518
Intervention_Surgical
bilateral sagittal split osteotomy of the mandible
16519
Intervention_Surgical
positioning of the condylar process
16520
Intervention_Surgical
bilateral sagittal split osteotomies for mandibular advancement .
16521
Intervention_Surgical
condyles were placed in the centre of the articular fossa before and during the operation , and in the other group they were not
16522
Intervention_Physical
magnetic resonance imaging ( MRI )
16523
Intervention_Physical
Fixing the condylar process in the centre of the articular fossa intraoperatively
16524
Outcome_Other
Differences on magnetic resonance imaging ( MRI )
16525
Outcome_Physical
maximal mouth opening
16526
Outcome_Physical
TMJs
16527
Participant_Condition
orthognathic
16528
Participant_Condition
temporomandibular joint ( TMJ )
16529
Participant_Condition
bilateral sagittal split osteotomy
16530
Participant_Condition
orthognathic
16531
Participant_Sample-size
28
16532
Participant_Condition
mandibular retrognathism
16533
Participant_Condition
bilateral sagittal split osteotomies
16534
Participant_Sample-size
14
16535
Participant_Sample-size
28
16536
Participant_Condition
TMJ
16537
Participant_Sample-size
15/28
16538
Participant_Condition
TMJs
16539
Participant_Sample-size
28
16540
Participant_Sample-size
3
16541
Participant_Condition
TMJs