title: Clinical application of a new compact computed tomography system for evaluating the outcome of regenerative therapy: a case report.
abstract: BACKGROUND
  The limitations of conventional 2-dimensional (2-D) radiographs have been emphasized in many studies. Because the image is a 2-D map of the 3-dimensional (3-D) tooth and periodontal tissue, these structures may be superimposed on each other. Recently, 3-D image analysis by computed tomography (CT) was introduced to dentistry, but it has been used only rarely in the periodontal field.
  
  
  METHODS
  The purpose of this case report was to introduce the clinical application of a newly developed, compact computed tomography system for evaluating the outcome of regenerative therapy in an adult patient with periodontitis (male, aged 55 years). To evaluate the bone defects including furcation involvement, we took an intraoral radiograph and performed CT scanning on tooth #19. We recorded a number of clinical parameters at the time of surgery. We compared the images of the bone defect obtained by CT images and the conventional radiograph with the true bone defect morphology at the surgical site.
  
  
  RESULTS
  One year after the periodontal surgery, we again took CT scans and a conventional radiograph, and the new images of the bone defect were compared and evaluated. The new CT images were reconstructed for 3-D evaluation and compared with those taken before surgery. The CT provides 3-D images of excellent quality for evaluating the morphology of the periodontal bone defect and furcation involvement.
  
  
  CONCLUSIONS
  We consider that CT is a useful aid in periodontal examination and diagnosis, and in the prediction and evaluation of periodontal treatment outcomes.
authors.affiliation: Department of Periodontology, Nihon University School of Dentistry, Tokyo, Japan. ito-k@dent.nihon-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: N
authors.initials: N
authors.lastname: Yoshinuma
authors.forename: E
authors.initials: E
authors.lastname: Goke
authors.forename: Y
authors.initials: Y
authors.lastname: Arai
authors.forename: K
authors.initials: K
authors.lastname: Shinoda
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000601:surgery; D005500:Follow-Up Studies; D017823:Furcation Defects / Q000000981:diagnostic imaging / Q000601:surgery; D016557:Guided Tissue Regeneration, Periodontal; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008297:Male; D008875:Middle Aged; D010518:Periodontitis / Q000000981:diagnostic imaging / Q000601:surgery*; D011856:Radiographic Image Enhancement / Q000379:methods; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome