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Related Experiment Videos

Prediction of mandibular autorotation

N Nadjmi1, M Y Mommaerts, J V Abeloos

  • 1Department of Surgery, General Hospital St John, Bruges, Belgium.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|November 20, 1998
PubMed
Summary

The center of mandibular autorotation (CAR) remains consistent during jaw opening and maxillary impaction surgery. This finding confirms that the CAR can predict mandibular position for surgical planning.

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Area of Science:

  • Orthognathic surgery
  • Dental cephalometrics

Background:

  • Maxillary impaction surgery aims to correct occlusal and facial deformities.
  • Predicting mandibular position is crucial for successful surgical outcomes.

Purpose of the Study:

  • To test if the center of mandibular autorotation (CAR) is constant during jaw opening and maxillary impaction.
  • To evaluate the CAR's utility in predicting mandibular position and guiding surgical decisions.

Main Methods:

  • Lateral cephalograms were taken preoperatively (centric relation and 10mm jaw opening) and postoperatively in 20 patients undergoing maxillary impaction.
  • The CAR was calculated using the Rouleaux method.
  • Postoperative cephalograms were superimposed on preoperative ones using cranial base landmarks.

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Main Results:

  • No significant difference was found in the preoperative and postoperative distances between the CAR and the incisal point.
  • The hypothesis that the mandible rotates around the same point was supported.

Conclusions:

  • The study provides a practical and precise method for determining an individual's CAR.
  • The center of rotation during initial jaw opening is consistent with that during impaction surgery, validating its use in surgical planning.