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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Accuracy of predicting the pharyngeal airway space on the cephalogram after mandibular setback surgery
Toshitaka Muto1, Atsue Yamazaki, Shigehiro Takeda
1Department of Oral & Maxillofacial Surgery, National Defense Medical College, Saitama, Japan. muto@ndmc.ac.jp
Purpose:
The aim of the present study was to evaluate the accuracy of a formula predicting the change of pharyngeal airway space (PAS) on the cephalogram after mandibular setback surgery.
Patients And Methods:
Twenty-nine female adults with mandibular prognathism underwent surgery by bilateral sagittal split ramus osteotomy. The postoperative anteroposterior (A-P) PAS dimension was calculated from the change of C3-Me (distance between the anteroinferior point of the third cervical vertebra and menton) using 2 cephalograms taken before treatment and at 1 year after surgery. The regression equation used was y = -21.105 + 0.402x (y: PAS; x: C3-Me; r = 0.854).
Results:
The predicted and measured values were nearly same on average, and the difference between both ranged within +/-1.5 mm for each case individually.
Conclusion:
This study suggested that the postoperative A-P PAS dimension can be predicted from the change in C3-Me, matching the amount of the mandibular setback.
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