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Sagittal split ramus osteotomy-related biomechanical properties.

G Rougier1, J Boisson2, N Thurieau2

  • 1Department of Maxillofacial Surgery and Plastic Surgery, National Reference Center for Cleft Lip and Palate, Hôpital Universitaire Necker-Enfants Malades, Paris, France; IMSIA, ENSTA Paris-Tech, Department of Mechanical Engineering, Palaiseau, France.

The British Journal of Oral & Maxillofacial Surgery
|July 7, 2020
PubMed
Summary
This summary is machine-generated.

This study details the biomechanical properties of sagittal split ramus osteotomy (SSRO), a common jaw surgery. It provides the first quantitative data on bone hardness and fracture resistance during SSRO, aiding surgical planning.

Keywords:
Biomechanical propertiesCadaveric testsMandibular boneRamus sagittal osteotomySurgical simulation

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Area of Science:

  • Biomechanical Engineering
  • Oral and Maxillofacial Surgery
  • Materials Science

Background:

  • Sagittal split ramus osteotomy (SSRO) is a prevalent maxillofacial surgical procedure.
  • The technique's success depends on understanding biomechanical variables during bone fracture.
  • Current literature lacks detailed biomechanical data specific to SSRO steps.

Purpose of the Study:

  • To investigate the biomechanical characteristics of human mandibles during sagittal split osteotomy.
  • To quantify bone hardness and fracture resistance at different anatomical sites relevant to SSRO.

Main Methods:

  • Eight human mandibles were used, with right sides undergoing hardness testing.
  • Left sides were subjected to a traction-to-fracture test following Epker's SSRO technique.
  • Hardness was measured using an automatic hardness testing machine (Vickers scale), and fracture forces were recorded with an electromechanical testing machine.

Main Results:

  • Mean bone hardness values varied across different mandibular regions, with the full body showing the highest hardness (28.7 HV).
  • Traction-to-fracture tests revealed significant differences in force and displacement before fracture among specimens, indicating regional variations in bone strength.
  • This study presents the first quantitative biomechanical data for SSRO, including hardness (HV) and fracture force (N) measurements.

Conclusions:

  • The study establishes foundational biomechanical data for sagittal split ramus osteotomy.
  • Findings highlight regional variations in mandibular bone properties relevant to SSRO.
  • A reproducible method for evaluating SSRO biomechanics is proposed, potentially improving surgical outcomes.