title: Assessment of maxillary sinus volume for the sinus lift operation by three-dimensional magnetic resonance imaging.
abstract: OBJECTIVE
  To calculate sinus and bone graft volumes and vertical bone heights from sequential magnetic resonance imaging (MRI) examinations in patients undergoing a sinus lift operation.
  
  
  METHODS
  MRI scans were obtained pre-operatively and at 10 days and 10 weeks post-operatively, using a 0.95 tesla MRI scanner and a three-dimensional (3D) magnetisation prepared, rapid acquisition gradient-echo (MP-RAGE) sequence.
  
  
  RESULTS
  Estimates of the bone graft volumes required for a desired vertical bone height were made from the pre-operative MRI scan. Measurements of the graft volumes and bone heights actually achieved were made from the post-operative scans. The MRI appearance of the graft changed between the 10 day and 10 week scans.
  
  
  CONCLUSIONS
  We have proposed a technique which has the potential to give the surgeon an estimate of the optimum volume of graft for the sinus lift operation from the pre-operative MRI scan alone and demonstrated its application in a single patient. Changes in the sequential MRI appearance of the graft are consistent with replacement of fluid by a matrix of trabecular bone.
authors.affiliation: Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen, Scotland, UK.
authors.forename: C F
authors.initials: CF
authors.lastname: Gray
authors.forename: R T
authors.initials: RT
authors.lastname: Staff
authors.forename: T W
authors.initials: TW
authors.lastname: Redpath
authors.forename: G
authors.initials: G
authors.lastname: Needham
authors.forename: N M
authors.initials: NM
authors.lastname: Renny
mesh_terms: D000293:Adolescent; D000540:Alveolar Ridge Augmentation / Q000379:methods*; D000848:Anodontia / Q000601:surgery; D016025:Bone Transplantation / Q000473:pathology; D003287:Contrast Media; D003758:Dental Implantation, Endosseous; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008443:Maxillary Sinus / Q000473:pathology* / Q000601:surgery; D014182:Transplantation, Autologous
chemical_list: D003287:Contrast Media