Retrospective Study on the Application of Tooth-bone Dual-support Osteotomy/Location Plate in "Surgery-first" Orthognathic Treatment

NCT07622758 | Completed DMC

• 1 other identifier: 2026（085）
• Study Type: observational
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

The goal of this observational study is to learn the accuracy of tooth-bone dual-support osteotomy/location guide plate compared with conventional CAD/CAM interocclusal splints in "surgery-first" orthognathic surgeries. The main question it aims to answer is: Does the tooth-bone dual-support osteotomy/location guide plate performed better in accuracy? Does the tooth-bone dual-support osteotomy/location guide plate saved operation time? Participants already underwent orthognathic surgeries.

Conditions

Accuracy; Operation Time

Outcome Measures

Primary Outcomes (2)

• Accuracy

  before and 7 days after the surgery

• operation time

  the day of surgery

Study Arms (2)

tooth-bone dual support cutting/repositioning guide

This tooth-bone dual support cutting/repositioning guide is a custom surgical template used in orthognathic surgery. It integrates both tooth-borne and bone-borne fixation for high stability. It accurately defines osteotomy lines and repositioning paths, improves surgical precision, reduces intraoperative error, and enhances postoperative occlusion and facial symmetry.

Procedure: orthognathic surgery

interocclusal splint

An interocclusal splint is a custom-made acrylic appliance widely used in orthognathic surgery. It establishes stable, reproducible maxillomandibular relationship, guides precise repositioning of jaws, maintains planned occlusion intraoperatively, and improves surgical accuracy and postoperative stability.

Procedure: orthognathic surgery

Interventions

orthognathic surgery PROCEDURE

Orthognathic surgery corrects congenital and acquired dentofacial deformities by surgically repositioning the maxilla, mandible, or chin. It treats severe malocclusion, facial asymmetry, retrognathia, prognathism, and functional issues such as breathing, chewing, and speech difficulties. Performed in conjunction with orthodontic treatment, the surgery uses pre-surgical planning, interocclusal splints, and cutting guides to achieve accurate bony repositioning and stable internal fixation. It improves both facial aesthetics and stomatognathic function, greatly enhancing patients' quality of life.

interocclusal splint; tooth-bone dual support cutting/repositioning guide

Eligibility Criteria

• Age: 18 Years - 40 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

Patients primarily diagnosed as "dentofacial deformities" who are scheduled for "surgery-first" bimaxillary orthognathic surgery. They are cases eligible for the surgery-first approach after joint assessment by craniomaxillofacial surgeons and orthodontists. Orthodontists confirm that satisfactory occlusal relationships can be achieved via postoperative orthodontic treatment. Preoperative requirements are as follows: no or mild anterior crowding, flat or shallow Spee's curve, slight incisor inclination, harmonious maxillary and mandibular dental arches, and at least three stable occlusal contacts in the transitional occlusion.

You may qualify if:

• Age: 18 to 40 years old.
• Diagnosis: Patients treated at Plastic Surgery Hospital, Chinese Academy of Medical Sciences. Diagnosed with dentofacial deformity upon comprehensive evaluation by two senior attending plastic surgeons.
• Surgical plan: Scheduled for bimaxillary orthognathic surgery, which may be combined with subapical osteotomy of the maxilla and mandible or genioplasty.
• Treatment protocol: Cases eligible for the surgery-first approach after joint assessment by craniomaxillofacial surgeons and orthodontists. Orthodontists confirm that satisfactory occlusal relationships can be achieved via postoperative orthodontic treatment. Preoperative requirements are as follows: no or mild anterior crowding, flat or shallow Spee's curve, slight incisor inclination, harmonious maxillary and mandibular dental arches, and at least three stable occlusal contacts in the transitional occlusion.
• Agreement to follow-up and signed informed consent form.

You may not qualify if:

• Presence of comorbid diseases or symptoms that may increase surgical risks or compromise surgical outcomes, as determined by two senior plastic surgeons, including but not limited to hypertension, diabetes, immune thrombocytopenic purpura, and hemoglobin (Hb) ≤ 100 g/L.
• Body dysmorphic disorder, history of psychiatric disorders, or excessively demanding patients with unrealistic expectations.
• Facial skeletal tumors.
• Revision surgery after prior orthognathic procedures.

Sponsors & Collaborators

• Peking Union Medical College: lead

Study Sites (1)

Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College

Beijing, Beijing Municipality, 100144, China

Location

MeSH Terms

Interventions

Orthognathic Surgery

Intervention Hierarchy (Ancestors)

Surgery, Oral; Dentistry

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: RETROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Dr.

Study Record Dates

• First Submitted: May 28, 2026
• First Posted: June 3, 2026
• Study Start: February 1, 2024
• Primary Completion: May 1, 2026
• Study Completion: May 25, 2026
• Last Updated: June 3, 2026

Record last verified: 2026-05

Locations

CN (1)