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Condylar surface CT value in sagittal plane before and after sagittal split ramus osteotomy
Koichiro Ueki1, Kunio Yoshizawa2, Akinori Moroi2
1Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School, University of Yamanashi, 1110 Shimokato Chuo, Yamanashi, 409-3893, Japan. kueki@yamanashi.ac.jp.
Oral and Maxillofacial Surgery
|March 2, 2017
Summary
Computed tomography (CT) values of the condylar surface change after jaw surgery, particularly in asymmetric cases. Anterior disc displacement correlates with higher anterior condylar CT values post-surgery.
Area of Science:
- Oral and Maxillofacial Surgery
- Radiology
- Orthodontics
Background:
- Temporomandibular joint (TMJ) disc displacement is a common condition.
- Sagittal split ramus osteotomy (SSRO) setback surgery is used to correct jaw deformities.
- Understanding changes in condylar surface properties after SSRO is crucial for treatment outcomes.
Purpose of the Study:
- To investigate the relationship between computed tomography (CT) values of the condylar surface and temporomandibular joint (TMJ) disc position.
- To evaluate these relationships before and after sagittal split ramus osteotomy (SSRO) setback surgery.
- To analyze changes in condylar morphology and disc position in symmetric and asymmetric patient groups.
Main Methods:
- Retrospective analysis of 75 patients (150 condyles) who underwent bilateral SSRO setback surgery.
- Measurement of maximum CT values and condylar/fossa dimensions in the sagittal plane preoperatively and 1 year postoperatively.
- Classification of TMJ disc position (anterior displacement, anterior, fully covered, posterior) using MRI pre- and postoperatively.
Main Results:
- Postoperative CT values at 135° and 180° were significantly higher than preoperative values on the non-deviation side in asymmetric patients.
- Patients with anterior disc displacement showed significantly higher CT values at the 0° point, both pre- and postoperatively.
- Condylar surface CT values demonstrated changes in the non-deviation side of asymmetric patients one year after SSRO.
Conclusions:
- CT values of the posterior condylar surface can change in the non-deviation side of asymmetric patients one year after SSRO.
- Condyles with anterior disc displacement exhibit high anterior condylar CT values both before and after surgery.
- These findings highlight the dynamic changes in condylar morphology and disc position following SSRO, particularly in asymmetric cases.
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