title: Evaluation of Three-Dimensional Volumetric Changes After Sinus Floor Augmentation with Mineralized Cortical Bone Allograft.
abstract: OBJECTIVE
  The aim of this retrospective study was to quantify three-dimensional (3D) volumetric bone changes over a two-year period in maxillary sinuses augmented with a mineralized cortical bone allograft material (MCBA) material.
  
  
  METHODS
  Eleven patients (6 males and 5 females) with mean of age of 51.6 (range: 46-61) years were treated to increase the vertical dimension of the alveolar crest by maxillary sinus floor augmentation procedure. Study data were collected from patient records and by analyzing preoperative radiographs and cone beam computed tomography (CBCT) scans taken within the first two weeks after maxillary sinus lift (T0), immediately before implant placement four months after grafting (T1), and after one year of implant loading (T2). All DICOM-formatted images were rendered into volumetric images using software that automatically calculated the volume of the grafted material in cubic centimeters.
  
  
  RESULTS
  Mean graft volume was 16.24 ± 1.54 cm(3) at T0, 14.48 ± 1.48 cm(3) at T1 and 13.06 ± 1.39 cm(3) at T2. Mean volume retraction resulted in 1.76 ± 0.34 cm(3) ΔV1 (T0-T1) and 1.42 ± 0.4 cm(3) ΔV2 (T1-T2) and was 10.83 % of the initial total volume at (T0-T1) and 9.8 % of the total volume (T1-T2).
  
  
  CONCLUSIONS
  The present retrospective investigation demonstrated a 20.63 % decrease in graft volume. Volumetric 3D assessment of CBCT scans with the selected software appeared to be a promising approach to quantifying long-term changes in the grafted area.
authors.affiliation: Oral and Maxillofacial Surgery Department, School of Dentistry, Lebanese University, P.O. Box 5208-116, Beirut, Lebanon ; Oral Surgery Section, ENT Department, Sacre-Coeur Hospital, Lebanese University, Beirut, Lebanon.
authors.forename: Antoine
authors.initials: A
authors.lastname: Berberi
authors.affiliation: Department of Orthodontics, Case Western Reserve University, Cleveland, OH USA.
authors.forename: Lea
authors.initials: L
authors.lastname: Bouserhal
authors.affiliation: Oral and Maxillofacial Surgery Department, School of Dentistry, Lebanese University, P.O. Box 5208-116, Beirut, Lebanon.
authors.forename: Nabih
authors.initials: N
authors.lastname: Nader
authors.affiliation: Oral and Maxillofacial Surgery Department, School of Dentistry, Lebanese University, P.O. Box 5208-116, Beirut, Lebanon.
authors.forename: Rita Bou
authors.initials: RB
authors.lastname: Assaf
authors.affiliation: Orthodontics Department, Faculty of Dental Medicine, Saint-Joseph University, Beirut, Lebanon.
authors.forename: Nayla Bassil
authors.initials: NB
authors.lastname: Nassif
authors.affiliation: Orthodontics Department, Faculty of Dental Medicine, Saint-Joseph University, Beirut, Lebanon.
authors.forename: Joseph
authors.initials: J
authors.lastname: Bouserhal
authors.affiliation: Oral and Maxillofacial Surgery Department, School of Dentistry, Lebanese University, P.O. Box 5208-116, Beirut, Lebanon.
authors.forename: Ziad
authors.initials: Z
authors.lastname: Salameh
keywords: Allograft; Augmentation; Sinus graft; Volume