الفهرس 
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Abstract
The present study was conducted to assess the airway three dimensionally in skeletal class III patients following bimaxillary orthognathic surgery (setback mandible and advancement of maxilla) by using Dolphin 3D software (version 11.9, Dolphin Imaging and Management Solutions, Chatsworth, Calif).
The study involved sixteen adult patients suffering from skeletal class III (protruding mandible) selected from outpatient clinic and in patient department of the Craniomaxillofacial Surgery Department, Nasser Institute Hospital for Research and Treatment & from the outpatient clinic, Oral and Maxillofacial Surgery Department at Ain Shams University.
A prospective comparative study was carried out in those patients with the following inclusion criteria:
Inclusion criteria:
1. Fit and well patients whom have no medical compromising conditions that affect bone or soft tissues healing (ASA I & II).
2. Skeletal class III patients (mandibular prognathism and maxillary deficiency)
3. Only adult patients (over 18 to 50 years).
4. Good oral hygiene.
5. Both genders were accepted.
6. Patients that had routine preoperative clinical and laboratory investigations prior to the surgical procedure.
7. Preoperative & postoperative multislice Computed Tomography (CT) scan showing the entirety of the facial skeleton and the neck performed.
Radiographic assessment was done for all patients according to the following schedule:
1) Preoperative CT.
2) Immediate postoperative CT.
3) Six months postoperative CT.
The collected data were tabulated and statistically analyzed.
The 3D upper airway model was reconstructed in Dolphin 3D software (version 11.9, Dolphin Imaging and Management Solutions, Chatsworth, Calif) of all radiographs before and after the surgery.
Then the upper airway generally was divided into two parts: pharyngeal airway and nasal airway. The pharyngeal airway further was divided into nasopharynx, velopharynx and glossopharynx. Linear distance, area, and volume measurements was performed on the 3D airway model and be compared to each other’s.
The results showed that there was a significant difference in total volume of pharyngeal airway before and after the bimaxillary orthognathic surgery treating the skeletal class III patients.