title: Tridimensional analysis of maxillary sinus anatomy related to sinus lift procedure.
abstract: OBJECTIVE
  To evaluate the angulation of the maxillary sinus walls at the apical sinus region.
  
  
  METHODS
  Using preoperative computerized tomographies of 15 patients selected for sinus lift procedures, the angulation of the maxillary sinus floor was measured drawing straight lines tangential to the mesial and lateral walls. The measurements were taken from sagittal images at specific areas (i.e., second bicuspid, first molar, and second molar).
  
  
  RESULTS
  The results showed that the second bicuspid sites have a sharper angulation than the second molar sites, and these second molar sites have a sharper angle than the first molar sites.
  
  
  CONCLUSIONS
  The sharper angle observed in the second bicuspid area can influence the feasibility of schneiderian membrane evaluation when compared to the molar areas.
authors.affiliation: Oral Implantology at Estácio de Sá University. glaucovelloso@predialnet.com.br
authors.forename: Glauco Rodrigues
authors.initials: GR
authors.lastname: Velloso
authors.forename: Guaracilei Maciel
authors.initials: GM
authors.lastname: Vidigal
authors.forename: Marcos Motta
authors.initials: MM
authors.lastname: de Freitas
authors.forename: Oldemar F
authors.initials: OF
authors.lastname: Garcia de Brito
authors.forename: Marcelo Corrêa
authors.initials: MC
authors.lastname: Manso
authors.forename: Mario
authors.initials: M
authors.lastname: Groisman
mesh_terms: D000704:Analysis of Variance; D002508:Cephalometry / Q000379:methods; D003758:Dental Implantation, Endosseous; D006801:Humans; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging*; D008443:Maxillary Sinus / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery; D014057:Tomography, X-Ray Computed / Q000379:methods