Oral and maxillofacial surgeryChanges in the temporomandibular joint disc position after orthognathic surgery
Section snippets
Materials and Methods
This research was approved by the Institutional Review Board at Seoul National University, Bundang Hospital. Patients agreed to this study. Patients had no clinical symptom including mouth opening limitation, TMJ pain, and so forth. But detailed clinical signs and symptoms relating to TMD before and after surgery were not evaluated.
Of the patients with mandibular prognathism who underwent bilateral mandibular sagittal split ramus osteotomy at the Department of Oral and Maxillofacial Surgery of
Results
The sagittal images of bilateral mandible were analyzed in all patients. This showed that the distance between mandibular condyle and articular disc in mouth opening was 1.74 ± 2.13 mm preoperatively and 2.44 ± 2.10 mm postoperatively. That is, the distance between mandibular condyle and articular disc was significantly increased by 0.70 ± 1.30 mm on average following orthognathic surgery (P < .01). In mouth closing, the location of articular disc had a mean change of −0.11 ± 1.46 mm; however,
Discussion
According to one of the representative orthognathic surgeries, BSSRO can induce the change in the location of mandibular condyle and the displacement of articular disc. However, there is still a controversy as to whether or not orthognathic surgery has an effect on the TMJ. For instance, some studies have reported that the specific symptoms and signs of TMD were improved following the surgical correction of maxillofacial deformity (TMD). Other studies have reported that there was no significant
Conclusions
In our series, the location of the articular disc according to a specific mouth opening demonstrated a signficant change on preoperative and postoperative MRI scans. However, when comprehensively analyzing these results, the location of the articular disc and stage of internal disc derangement did not greatly vary in the mouth closing phase. Moreover, the amount of mandibular setback did not have a big effect on the changes of the location of articular disc.
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Cited by (0)
This study was supported by grant no 11-2008-014 from the SNUBH Research Fund.