title: Computerized tomography-assisted calculation of sinus augmentation volume.
abstract: OBJECTIVE
  This study was intended to calculate the augmentation volume for a sinus lift procedure based on cross-sectional computerized tomography (CT) scans for 2 different augmentation heights.
  
  
  METHODS
  Based on area calculations of cross-sectional CT scans, the volume of additional bone needed was calculated for 44 sinus lift procedures. The amount of bone volume needed to raise the sinus floor to heights of both 12 and 17 mm was calculated.
  
  
  RESULTS
  To achieve a sinus floor height of 12 mm, it was necessary to increase the height by a mean of 7.2+/-2.1 mm (range, 3.0 to 10.5 mm), depending on the residual ridge height; to achieve a height of 17 mm, a mean of 12.4+/-2.0 mm (range, 8.5 to 15.5 mm) was required (P < .01). The calculated augmentation volume for an augmentation height of 12 mm was 1.7+/-.9 cm3; for an augmentation height of 17 mm, the volume required was 3.6+/-1.5 cm3. Increasing the height of the sinus lift by 5 mm, ie, from 12 mm to 17 mm augmentation height, increased the augmentation volume by 100%. A significant correlation was found between augmentation height and the calculated sinus lift augmentation volume (r = 0. 78, P < .01).
  
  
  CONCLUSIONS
  Detailed preoperative knowledge of sinus lift augmentation volume is helpful as a predictive value in deciding on a donor site for harvesting autogenous bone and on the ratio of bone to bone substitute to use. Calculation of the augmentation size can help determine the surgical approach and thus perioperative treatment and the costs of the surgery for both patients and clinicians.
authors.affiliation: Department of Prosthodontics, Dental School, University of Vienna, Austria. krennmair@aon.at
authors.forename: Gerald
authors.initials: G
authors.lastname: Krennmair
authors.forename: Martin
authors.initials: M
authors.lastname: Krainhöfner
authors.forename: Harald
authors.initials: H
authors.lastname: Maier
authors.forename: Michael
authors.initials: M
authors.lastname: Weinländer
authors.forename: Eva
authors.initials: E
authors.lastname: Piehslinger
mesh_terms: D000328:Adult; D000368:Aged; D000539:Alveolar Process / Q000000981:diagnostic imaging / Q000473:pathology; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D019412:Anatomy, Cross-Sectional; D016025:Bone Transplantation / Q000473:pathology; D002508:Cephalometry; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008443:Maxillary Sinus / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D010347:Patient Care Planning; D011862:Radiography, Panoramic; D014057:Tomography, X-Ray Computed / Q000379:methods*