Clinical and histopathological study of simus lift procedure

Abstract

Sixteen sinuses of 11 patients performed by sinus lift procedure were retrospectively discussed clinically and histopathological investigations from grafted materials. Grafted materials were 10 autogenous bones harvested from 1 iliac crest and 9 chin bones, 1 non-resorbable hydroxyapatite plus mandibular alveolar ridge bone, and 1 mixed of resorbable hydroxyapatite plus human freezed dry bone. Histopathological investigation on several small speciemens taken from grafts of these different materials was performed. New bone formation, small amount of bone resorption and fibrous encapsuling tissue were observed for autogenous bone graft, but new bone formation was delayed around non-resorbable hydroxyapatite particles, and most of all grafted specimens of human freezed dry bone was replaced and encapsulated by fibrous tissues. These results showed that autogenous bone is highly recommended as graft material for sinus lift procedure. Endosseous implants were placed for 8 patients in the first group after an average period of 9.2 months of elevation, and for 2 patients in the second group at the time of elevation. One patient in the third group received a second sinus elevation to prevent maxillary sinusitis by perforating through maxillary sinus membrane following the installation. The survival rate of dental implants with sinus lift procedure was 94.1% after fabrication of prosthesis without any complication.