title: Evaluation of three-dimensional changes after sinus floor augmentation with different grafting materials.
abstract: OBJECTIVE
  The aim of this retrospective investigation was to assess the dimensional stability of different grafting materials after maxillary sinus floor augmentation with computed tomography (CT) scans.
  
  
  METHODS
  Two postoperative CT scans were available from 16 patients who had undergone maxillary sinus lift procedures. The first scan was made within a few days after the surgical intervention and the second one >6 months later. A total of 25 maxillary sinuses were augmented with different materials before implant insertion by lateral antrostomy in a staged approach. The volume of bone formation was calculated using the Somaris Sienet Magic View software.
  
  
  RESULTS
  Based on volumetric measurements of the augmented domes derived from the image sections, shrinkage was about 26%. The mean of the augmented bone volume was 3.02 cm(3) (1.4-5.56 cm(3); SD+/-1.18 cm(3)) as determined in the first CT scan. The respective mean volume in the second CT scan amounted to 2.28 cm(3) (0.92-4.46 cm(3); SD+/-1.07 cm(3)).
  
  
  CONCLUSIONS
  Within the limits of our descriptive and analytic study, the results indicate a significant reduction of the graft volume after maxillary sinus augmentation. Further prospective studies will have to evaluate the quantitative changes of different bone graft materials for maxillary sinus augmentation procedures in order to improve long-term implant stability.
authors.affiliation: Department of Oral Surgery and Radiology, School of Dentistry, Medical University of Graz, Graz, Austria.
authors.forename: Robert
authors.initials: R
authors.lastname: Kirmeier
authors.forename: Michael
authors.initials: M
authors.lastname: Payer
authors.forename: Martin
authors.initials: M
authors.lastname: Wehrschuetz
authors.forename: Norbert
authors.initials: N
authors.lastname: Jakse
authors.forename: Susanne
authors.initials: S
authors.lastname: Platzer
authors.forename: Martin
authors.initials: M
authors.lastname: Lorenzoni
mesh_terms: D000388:Air; D015519:Bone Density; D001862:Bone Resorption / Q000209:etiology*; D018786:Bone Substitutes; D016025:Bone Transplantation / Q000379:methods*; D003758:Dental Implantation, Endosseous / Q000379:methods; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000601:surgery*; D008875:Middle Aged; D008903:Minerals; D009092:Mucous Membrane / Q000293:injuries; D009297:Nasal Mucosa / Q000293:injuries; D013516:Oral Surgical Procedures, Preprosthetic / Q000009:adverse effects* / Q000379:methods; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed
chemical_list: C483718:Algipore; C077540:Bio-Oss; D018786:Bone Substitutes; D008903:Minerals