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Related Concept Videos

Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...

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Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants
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Facial frontal morphological changes related to mandibular setback osteotomy using cephalograms.

Katsuhiko Amano1, Takakazu Yagi, Seiji Iida

  • 1The First Department of Oral and Maxillofacial Surgery, Osaka University Graduate School of Dentistry, Osaka, Japan. k-tenno@ace.ocn.ne.jp

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|June 2, 2009
PubMed
Summary

Bilateral sagittal split osteotomy for mandibular setback can cause changes in facial morphology. Screw fixation demonstrated greater stability compared to plate fixation in this cephalometric study.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthognathic Surgery
  • Craniofacial Anatomy

Background:

  • Mandibular setback surgery, specifically bilateral sagittal split osteotomy (BSSO), is a common procedure for correcting skeletal discrepancies.
  • Assessing the stability and morphological changes following BSSO is crucial for predictable outcomes.
  • Different rigid fixation methods, such as screws and plates, may influence postoperative stability and skeletal relapse.

Purpose of the Study:

  • To evaluate the morphological alterations in the mandibular region after BSSO using frontal cephalograms.
  • To compare the stability of screw fixation versus plate fixation in BSSO procedures.

Main Methods:

  • Frontal cephalograms were analyzed from 26 patients preoperatively and postoperatively.
  • Key parameters measured included Angle 'A' (formed by lines along the mandibular ramus) and mandibular width at the angle.
  • Patients were categorized based on fixation type: screw or plate.

Main Results:

  • Overall, Angle 'A' and mandibular width showed minimal early changes but decreased and increased, respectively, late postoperatively.
  • The plate fixation group exhibited an early decrease in Angle 'A', followed by a late increase and width reduction.
  • The screw fixation group demonstrated less significant changes in both parameters during the late postoperative period.

Conclusions:

  • Postoperative BSSO can lead to a tendency for the mandibular ramus to incline towards the facial midline.
  • The choice of rigid fixation significantly impacts frontal skeletal morphology and stability after BSSO.
  • Screw fixation appears to offer superior stability compared to plate fixation in BSSO procedures.