Radiographic Assessment of Three Dimensional Mandibular Position Using Splint-less Patient Specific Implant

Last updated: December 5, 2023
Sponsor: Ain Shams University
Overall Status: Active - Recruiting

Phase

N/A

Condition

Birth Defects

Holoprosencephaly

Treatment

mandibular saggital split osteotomy

Clinical Study ID

NCT06160661
FDASU-Rec ID032243
  • All Genders
  • Accepts Healthy Volunteers

Study Summary

The purpose of this study was to assess the accuracy of a splint-less approach for mandibular jaw orthognathic surgery. This approach utilized a personalized orthognathic surgical guide (POSG) system, which comprised a set of cutting guides and 3D printed custom titanium fixation plates for bilateral sagittal split osteotomies (BSSOs).

The cutting guides were first used to predrill screw holes and guide osteotomies.

The custom plates were then used to reposition and stabilize the bony segments as planned, without the use of surgical splints or any additional tool such as surgical navigation

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Patients suffering from skeletal deformity requiring mandibular orthognathic surgery (Bilateral sagittal splitting osteotomy).
  2. Patients should be free from any systemic disease that may affect normal bone healingand predictable outcome.

Exclusion

Exclusion Criteria:

  1. Patients with metabolic bone disease that affects bone healing.
  2. Intra-bony lesions that may affect the osteotomy healing.
  3. Patients with history of radiotherapy on the head and neck region

Study Design

Total Participants: 10
Treatment Group(s): 1
Primary Treatment: mandibular saggital split osteotomy
Phase:
Study Start date:
January 01, 2022
Estimated Completion Date:
January 01, 2024

Study Description

Surgical technique:

The buccal bony surface of the mandible was exposed as a routine sagittal split osteotomy. First, the mandibular cutting guide was installed using the tooth-borne splint portion of the guide.

Second, the lower portion of the guide was temporarily fixed with titanium screws through the designed screw holes on the guide. The planned margins for vertical osteotomy/ ostectomy were then marked by a pencil.

Once the cutting guide was removed, the sagittal split osteotomy was completed as usual. Finally, the distal and proximal segments were fixed together using the custom plates and screw holes that were used by the cutting guide.

Accuracy of preoperative surgical planning, and validation of the use of patient specific implants (PSI) in bilateral sagittal split osteotomy (BSSO) by comparing the planned outcomes to the actual postoperative outcomes by two methos.

A)Evaluation the discrepancy between planned and obtained post-operative position of the mandibular plates, rami, and occlusion by analyzing the discrepancies in terms of rotation (roll, pitch and yaw) and translation (antero-posterior, lateral and vertical). These movements were determined by incorporating the segments in homologous bounding-boxes, aligning the planned model to the post-op result colorimetric map inspection.

B) Measurements of the linear differences between the planned and postoperative positions of the mandibular midlines, the chin, and the gonial angle.

Connect with a study center

  • Faculty of Dentistry

    Cairo,
    Egypt

    Active - Recruiting

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