Accuracy of Predicting the Pharyngeal Airway Space on the Cephalogram After Mandibular Setback Surgery
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.
⁎Professor, Department of Oral & Maxillofacial Surgery, National Defense Medical College, Saitama, Japan.
†Assistant Professor, Department of Orthodontics, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
‡Assistant Professor, Department of Orthodontics, School of Dentistry, Health Sciences University of Hokkaido, Hokkaido, Japan.
§Chief Professor, Department of Oral & Maxillofacial Surgery, National Defense Medical College, Saitama, Japan.
Address correspondence and reprint requests to Dr Muto: Department of Oral & Maxillofacial Surgery, National Defense Medical College, Tokorozawa, Saitama, 359-8513 Japan
ABSTRACT