title: Graft shrinkage and survival rate of implants after sinus floor elevation using a nanocrystalline hydroxyapatite embedded in silica gel matrix:  a 1-year prospective study.
abstract: OBJECTIVE
  The aims of this study were (1) to evaluate the vertical shrinkage percentage of nanocrystalline hydroxyapatite embedded in silica gel used for maxillary sinus floor elevation (SFE) and (2) to determine the survival rate of the implants 1 year after placement in the healed grafted sinuses.
  
  
  METHODS
  Eleven maxillary sinuses were augmented in eight patients with NanoBone. After a healing period averaging 14.42 months, 19 implants were placed and followed up with clinical and radiographic evaluation. Panoramic radiographs were taken immediately after SFE and at 12 months after grafting. Measurements of changes in height were made by a computerized measuring technique using an image editing software.
  
  
  RESULTS
  The mean graft height shrinkage percentage at 12 months after surgery was 8.84% (±5.32). One implant was lost before loading. All the 18 remaining osseointegrated implants received the prosthetic rehabilitation and were controlled after 3 months of functional loading. The implant survival rate at the 1-year interval was 94.74%.
  
  
  CONCLUSIONS
  A 100% NanoBone alloplastic graft used in lateral SFE procedures presented limited height shrinkage. Implants placed in these grafted sinuses showed survival rates similar to those found in published data. These results should be interpreted cautiously considering the study's reduced sample size.
authors.affiliation: Department of Oral Surgery, Oral Medicine, Oral and Maxillofacial Radiology, School of Dental Medicine, University of Geneva, Geneva, Switzerland. marc.elhage@unige.ch
authors.forename: Marc
authors.initials: M
authors.lastname: El Hage
authors.forename: Semaan
authors.initials: S
authors.lastname: Abi Najm
authors.forename: Mvark
authors.initials: M
authors.lastname: Bischof
authors.forename: Rabah
authors.initials: R
authors.lastname: Nedir
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Carrel
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Bernard
mesh_terms: D018786:Bone Substitutes; D003442:Crowns; D003758:Dental Implantation, Endosseous; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D004338:Drug Combinations; D017886:Durapatite; D006801:Humans; D007091:Image Processing, Computer-Assisted; D011446:Prospective Studies; D011862:Radiography, Panoramic; D012822:Silicon Dioxide; D059546:Sinus Floor Augmentation / Q000379:methods*
chemical_list: D018786:Bone Substitutes; D004338:Drug Combinations; C534915:NanoBone; D012822:Silicon Dioxide; D017886:Durapatite