title: Correlation between planned prosthetic and residual bone trajectories in dental implants.
abstract: BACKGROUND
  The success of dental implant treatment relies on a well-developed treatment plan approach. Historically, implant placement was guided mainly by residual bone height and width, at times compromising prosthetic needs.
  
  
  OBJECTIVE
  This study analyzed the amount of deviation between planned prosthetic trajectory and residual bone trajectory in different areas of the maxillary and mandibular dental arches, by using a tomographic survey in conjunction with imaging/surgical guides.
  
  
  METHODS
  Ninety-two patients with a total of 235 implant sites were selected for the study. An imaging and surgical guide with a radiopaque indicator was constructed to determine the planned prosthetic trajectory. Cross-sectional tomograms were taken through the indicator at each implant site. The outlines of the available bone, planned prosthetic trajectory, and residual bone trajectory were traced, and the difference in the trajectory between the 2 trajectories was determined.
  
  
  RESULTS
  Discrepancies between the planned prosthetic and the residual bone trajectories were greater in the mandibular molar area. This site was statistically different from other site groups at P =.05 (Tukey method). Statistically, all other site groups were not significantly different.
authors.affiliation: University of Rochester, Eastman Dental Center, Rochester, N.Y., USA.
authors.forename: D M
authors.initials: DM
authors.lastname: Almog
authors.forename: R
authors.initials: R
authors.lastname: Sanchez
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D003287:Contrast Media; D003481:Cuspid; D003724:Dental Arch / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D006801:Humans; D007180:Incisor; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008334:Mandible / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008963:Molar; D010347:Patient Care Planning; D011862:Radiography, Panoramic; D014056:Tomography, X-Ray
chemical_list: D003287:Contrast Media; D015921:Dental Implants