الفهرس 
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Abstract
The objective of this study was to evaluate the effectiveness of CAD/CAM guided osteotomy in BSSO with regards to operation time and sensory nerve involvement, and to evaluate radiographically the expected corrected position of the mandible in relation to the preoperative virtual planning using CT.
This study was conducted on a sample consisting of twenty patients who meet the inclusion criteria. They were randomly selected from the Outpatient Clinic of Alexandria University Teaching Hospital and treated in the operating room of the Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Alexandria University.
After sample selection according to the inclusion and exclusion criteria; the patients were allocated randomly into two equal parallel groups:
Control group: Ten patients were treated with the conventional method, without an osteotomy guide.
Study group: The other ten patients were treated with a CAD/CAM bone-borne guide.
Patients’ evaluation
All cases were evaluated as follows:
• Proper history taking including the patient’s past medical and dental history.
• Thorough clinical examination including both general, extraoral and intraoral examinations.
• Radiographic examination using Computed tomography.
Surgical procedures
All patients were treated under general anesthesia.
The surgical field was scrubbed with povidone-iodine surgical scrub solution, followed by draping of the patient with sterile towels exposing only the area of surgery.
The osteotomy was done through either conventional method in control group) or CAD/CAM guided in study group.
Clinical and radiographic follow up
Postoperative patient evaluation was performed clinically by comparing the operation time postoperative pain and sensory nerve involvement at 1 week, 2 weeks, and 3 months. Radiographic evaluation was performed by computed tomography (CT) at 1 month postoperatively.
Clinical and radiographic results
The surgical outcome revealed the satisfactory correction of their skeletal deformity. The study group showed significantly better results than control group concerning operation time, Visual Analogue Scale, and sensory nerve involvement (p ≤ 0.05.).
Both groups showed satisfactory results regarding radiographic evaluation postoperatively.