computer guided patient-specific PEEK implant will be used to augment patients with chin deficiency or chin asymmetry.

augmentation genioplasty will be done to patients with chin deficiency or asymmetry. using cone beam CT for each patient and special soft ware "MIMICS 15" , patient-specific implant design can be done. PEEK will be milled as CAD-CAM technique to finally get patient specific PEEK implant. with patient is under General anesthesia, the implant will inserted and fixed with titanium screws. closure in two layers will be done.

Inclusion Criteria:

• Adult male or female patients.
• Patients with retruded chin or with chin asymmetry.
• Patients with good oral hygiene.

Exclusion Criteria:

• Patients that need skeletal procedure in the mandible, other than genioplasty, at the same time of surgery or was done within time period less than 6 months.
• Patients with medical condition that may compromise the healing process.
• Patients with medical condition that is contraindicated for general anaesthesia.
• Presence of pathological lesion related to chin area.