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Objective <p>This study evaluated the effects of two orthognathic surgery-timing approaches on hard and soft tissues in skeletal Class III patients undergoing bimaxillary orthognathic surgery using cone beam computed tomography (CBCT) and stereophotogrammetry.</p> Methods <p>Patients undergoing non-extraction surgery were randomly assigned to either a surgery-first (SF) group (<i>n</i> = 12; 19.91 ± 2.60 years) or a surgery-early (SE) group (<i>n</i> = 12; 22.50 ± 2.90 years) for a total of 24 patients. Maxillary advancement was 3.64 ± 1.50&#xa0;mm in the SF group and 3.47 ± 2.77&#xa0;mm in the SE group, and mandibular setback was 2.25 ± 1.32&#xa0;mm and 1.20 ± 1.75&#xa0;mm, respectively. Millimetric (length, dehiscence, and fenestration), volumetric measurements, and soft tissue anthropometric assessments were collected using three-dimensional (3D) records obtained before treatment and after debonding.</p> Results <p>Following orthognathic surgery, a significant reduction in root length and volume measurements, and a significant increase in dehiscence were observed within the groups. Additionally, incisor teeth exhibited greater root resorption compared to other teeth. However, no significant differences were found between the groups regarding changes in hard or soft tissues.</p> Conclusions <p>These findings suggest that changes in root length, alveolar bone, and soft tissues are similar in the SF and SE approaches, indicating that these changes occur independently of the surgical timing in comparable patients.</p> The trial registration number (TRN) <p>is NCT06873451 (Date of registration: 13.02.2025; retrospectively registered).</p>

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3D assessment of root resorption and soft tissue adaptations in surgery-first vs. early orthognathic surgery: a randomized clinical trial

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Halime Saraç Kale,
  • Gökhan Çoban,
  • Ahmet Emin Demirbaş,
  • Emrah Soylu

摘要

Objective

This study evaluated the effects of two orthognathic surgery-timing approaches on hard and soft tissues in skeletal Class III patients undergoing bimaxillary orthognathic surgery using cone beam computed tomography (CBCT) and stereophotogrammetry.

Methods

Patients undergoing non-extraction surgery were randomly assigned to either a surgery-first (SF) group (n = 12; 19.91 ± 2.60 years) or a surgery-early (SE) group (n = 12; 22.50 ± 2.90 years) for a total of 24 patients. Maxillary advancement was 3.64 ± 1.50 mm in the SF group and 3.47 ± 2.77 mm in the SE group, and mandibular setback was 2.25 ± 1.32 mm and 1.20 ± 1.75 mm, respectively. Millimetric (length, dehiscence, and fenestration), volumetric measurements, and soft tissue anthropometric assessments were collected using three-dimensional (3D) records obtained before treatment and after debonding.

Results

Following orthognathic surgery, a significant reduction in root length and volume measurements, and a significant increase in dehiscence were observed within the groups. Additionally, incisor teeth exhibited greater root resorption compared to other teeth. However, no significant differences were found between the groups regarding changes in hard or soft tissues.

Conclusions

These findings suggest that changes in root length, alveolar bone, and soft tissues are similar in the SF and SE approaches, indicating that these changes occur independently of the surgical timing in comparable patients.

The trial registration number (TRN)

is NCT06873451 (Date of registration: 13.02.2025; retrospectively registered).