How the upper jaw bone segment is positioned during jaw surgery affects jaw joint remodeling

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This interventional study compares two proximal segment positioning techniques used during bilateral sagittal split ramus osteotomy in bimaxillary orthognathic surgery. Researchers will use CT scans taken before surgery, right after, and at 6 months postoperatively to assess changes in condylar morphology, alongside clinical findings. The aim is to determine if proximal segment rotation for inferior border alignment differs in its impact on postoperative condylar remodeling compared with inferior border leveling without rotation. Outcomes may influence surgical technique to optimize condylar stability and temporomandibular joint function. The study is conducted at Bezmialem Vakif University in Istanbul, enrolling adults aged 18–65 with skeletal Class III dentofacial deformities who meet the specified criteria.

Why it matters

Who can join: the full rules

Inclusion Criteria:

1. Patients with skeletal Class III dentofacial deformity scheduled to undergo bimaxillary orthognathic surgery.
2. Age between 18 and 65 years.
3. Patients who have completed preoperative orthodontic treatment.
4. Patients in whom the mandibular distal segment demonstrates a maximum counterclockwise rotation of 4° after bilateral sagittal split osteotomy (BSSO) when positioned in the final planned occlusion.

Exclusion Criteria:

1. History of temporomandibular joint surgery, orthognathic surgery, or tumor resection.
2. Presence of facial asymmetry.
3. Patients with cleft lip and/or palate, craniofacial syndromes, or a history of maxillofacial trauma.
4. Patients in whom the mandibular distal segment requires more than 4° of counterclockwise rotation after BSSO to achieve the final planned position, as the amount of inferior border (basal) resection required would exceed the clinically acceptable limit.

Where it's running

• Bezmialem Vakif University
  Istanbul, Fatih, Turkey (Türkiye) Recruiting

Study contacts

• Study coordinator: Taha Pergel, Asist Prof
• Email: tahapergel_05@hotmail.com
• Phone: +905316350088

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

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• Evaluating 3D Soft Tissue Simulation for Jaw Surgery

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.