الفهرس 
AbstractOnly 14 pages are availabe for public view
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Abstract
Statement of the problem: The pneumatisation of the maxillary sinus coupled with alveolar bone resorption frequently leads to insufficient volume of bone in posterior maxilla. The placement of implants presents a challenge in such situations and during the last decade various surgical procedures for augmenting the maxillary sinus have evolved. The lateral antrostomy with augmentation of the sinus using a mixure of hyalouronic acid and bovine bone with simultaneous implants installation is a promising technique as it promote the healing, reduce the number of surgical intervention. Purpose: This study aimed to evaluate the efficacy of using hyalouronic acid with bovine bone for maxillary sinus floor augmentation with simultaneous implant installation. Materials and methods: This study was implemented on 10 cases with atrophic edentulous posterior maxillary regions. All the cases underwent sinus floor elevation and augmentation with simultaneous implant installation. This was done in two stages, Stage I: lateral antrostomy was made by piezoelectric device, osteotomy of implant site by densah kit, augmentation of the sinus with a mixture of bovine bone with HA gel and then implant installation, finally coverage the lateral window with HA gel, Stage II: surgical exposure of the implant top surface and insertion of the implant healing abutment at 6 months after stage I surgery. After soft tissue healing around the abutment, all cases were referred to fixed prosthodontics department in Faculty of Dentistry. Tanta University for fixed prosthesis construction. All the patients had regular follow-up intervals throughout the study period to evaluate soft tissue and bone healing and implant stability. Results: The study was conducted on 10 cases of which there were 3 males (30%) and 7 females (70%). The age of the patients ranged between 35 and 51 years with a mean of 42.10 years. Concerning gingival healing around the implant, all the cases showed uneventful healing without any signs of inflammation, infection or dehiscence. Regarding panoramic x-ray and CBCT analysis of alveolar bone height and density showing significant implant osseointegration with increase in both height and density of alveolar bone. There was significant increase in implant stability from stage I (primary stability) to stage II (secondary stability). Conclusion: Within the limits of this study, we can conclude that the mixture of hyalouronic acid gel with bovine bone, gaining the advantage of osteoconductive potential of bovine bone with the anti-inflammatory, pro angiogenic properties of hyalouronic acid. Immediate implant installation after sinus floor augmentation is a promising surgical protocol that can reduce the number of the surgeries and over all treatment time.