Is the use of collagen membrane on top of particulate bone mixture covered by onlay bone block in Maxilla better than the use of mixture of particulate bone covered by onlay bone block without the use of collagen membrane, in terms of bone quantity?
Patients with maxillary residual alveolar bone height not less than 8 mm.
Alveolar bone width from less than or equal 5 mm.
Both genders.
At least missing single tooth.
• Heavy smokers more than 20 cigarettes per day.
Patients with alcohol abuse
Patients with narcotic abuse.
Patients with bone disease that may affect normal healing, example; hyperparathyroidism.