الفهرس 
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Abstract
This study was designed to evaluate healing response and bone formation after sinus floor elevation. Twenty mongrel male dogs were used. Through intraoral approach, the lateral wall of the maxillary sinus at right side was exposed after reflection of mucoperiosteal flap. An oval shape osteotomy was done to expose Scheniderian membrane that was separated from underlying bone and elevated creating a space that was filled with Bioactive Glass graft material. A resorbable collagen barrier membrane was applied to cover the osteotomy site, and then the mucoperiosteal flap was replaced and sutured with resorbable suture material. The same procedures were done in the left side without using any graft material nor barrier membrane and considered as a control side. Animals were divided according to predetermined time intervals after sacrifice (1, 1.5, 3 and 6 months) into four groups containing five animals in each. Clinical, histological and radiological evaluations were done to demonstrate evidences of new bone formation in the floor of the sinus. Clinical observation revealed faster healing and more bone formation in study sides than in controls in all groups. Histological results showed rapid formation of bony trabeculae and early maturation of newly formed bone in study sides in comparison with control sides. Although radiological results were not clear, they showed more clear margins with decrease in size of sinus cavity in study side of group IV animals (6 months). Finally, results of this present study suggest that Bioactive Glass is a successful bone graft material with a promising outcome. Further studies are needed to evaluate its use with dental implants in sinus floor elevation.