Post Extraction Changes After Ridge Preservation Using Allogeneic Dentin Matrix Vs Demineralized Freeze Dried Allograft

"preparation of Allogenic Demineralized Dentin Matrix: Extracted teeth will be collected from the Departments of oral maxillofacial surgery and periodontics, Cairo university. Cleaning the teeth from any caries, Filings, cement, tartar, soft tissue debris and prosthetic components will be performed using a diamond bur under abundant irrigation with physiological water. Then it will be proceeded to the following steps~1\. (Washing with Distilled water ) 2. (Quick Freezing with liquid nitrogen, then Grinding to particle size of 300- 800 μm). 3.(Ultrasonic Cleaning cycles, 1st with Distilled water , 2nd with 5-7% Hydrogen Perioxide then 3rd with Distilled water for at 60-80 o) 4. (Defatting with Chloroform Methanol Solution1:0.5. 5. (Demineralization with0.5N HCL) 6. (Dehydration with Neutral Ethyl Alcohol then Defatting with Chloroform Methanol Solution 1:0.5 for ) 7. (Washing with Normal Saline \& Freeze Drying then Sterilization using Ethylene oxide gas)."

combination allograft, is a particulate bone graft combining 70% mineralized ground cortical with 30% demineralized ground cortical Particle sizing: 250 - 1000um.