الفهرس 
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Abstract
The target of this study is to evaluate the use of patient-specific Zirconia membranes in GBR (Guided Bone Regeneration) treatments from a clinical and radiographical perspective, where they act as a space-maintaining device for bone graft materials.
The study included 10 patients having alveolar bone deficiency in the maxillary anterior region which hinders implant placement in this area.
All patients were selected from the cases admitted to the outpatient clinic of the Oral and Maxillofacial Surgery department, Alexandria University. All the selected subjects had an adequate zone of keratinized gingiva and sufficient inter-arch space for future dental rehabilitation before performing the GBR (Guided Bone Regeneration) procedure. Excluding those with systemic diseases which may affect bone turn over and smokers.
A thorough clinical and radiographical examination was done for every patient. After which the membrane design is performed using computer software, by using the CBCT (Cone Beam Computed Tomography) data to construct a virtual 3D (three-dimensional) model for the patient’s residual alveolar bony ridge, onto which the design is executed.
Thickness of the membrane used was the same in all cases (=0.7mm), while the mesio-distal and the labio-palatal dimensions were different for each case according to the amount of bone augmentation needed.
Xenograft bone substitute was placed under the membrane in all cases after which the membrane was secured with 2 screws labially, and tension-free closure was ensured on suturing the mucosa.