title: Improved accuracy in periodontal pocket depth measurement using optical coherence tomography.
abstract: OBJECTIVE
  The purpose of this study was to examine whether periodontal pocket could be satisfactorily visualized by optical coherence tomography (OCT) and to suggest quantitative methods for measuring periodontal pocket depth.
  
  
  METHODS
  We acquired OCT images of periodontal pockets in a porcine model and determined the actual axial resolution for measuring the exact periodontal pocket depth using a calibration method. Quantitative measurements of periodontal pockets were performed by real axial resolution and compared with the results from manual periodontal probing.
  
  
  RESULTS
  The average periodontal pocket depth measured by OCT was 3.10±0.15 mm, 4.11±0.17 mm, 5.09±0.17 mm, and 6.05±0.21 mm for each periodontal pocket model, respectively. These values were similar to those obtained by manual periodontal probing.
  
  
  CONCLUSIONS
  OCT was able to visualize periodontal pockets and show attachment loss. By calculating the calibration factor to determine the accurate axial resolution, quantitative standards for measuring periodontal pocket depth can be established regardless of the position of periodontal pocket in the OCT image.
authors.affiliation: Department of Periodontology, Seoul National University School of Dentistry, Seoul, Korea .
authors.forename: Sul-Hee
authors.identifier: 0000-0001-8475-881X
authors.initials: SH
authors.lastname: Kim
authors.affiliation: Department of Biomedical Radiation Sciences, Seoul National University Graduate School of Convergence Science and Technology, Seoul, Korea .
authors.forename: Se-Ryong
authors.identifier: 0000-0002-0016-1790
authors.initials: SR
authors.lastname: Kang
authors.affiliation: Department of Periodontology, Seoul National University School of Dentistry, Seoul, Korea.; Department of Health Policy and Management, Korea University College of Health Sciences, Seoul, Korea.
authors.forename: Hee-Jung
authors.identifier: 0000-0002-6789-9247
authors.initials: HJ
authors.lastname: Park
authors.affiliation: Dental Research Institute, Seoul National University School of Dentistry, Seoul, Korea .
authors.forename: Jun-Min
authors.identifier: 0000-0003-3443-4862
authors.initials: JM
authors.lastname: Kim
authors.affiliation: Dental Research Institute, Seoul National University School of Dentistry, Seoul, Korea.; Department of Oral and Maxillofacial Radiology, Seoul National University School of Dentistry, Seoul, Korea.
authors.forename: Won-Jin
authors.identifier: 0000-0002-5977-6634
authors.initials: WJ
authors.lastname: Yi
authors.affiliation: Department of Periodontology, Seoul National University School of Dentistry, Seoul, Korea.; Dental Research Institute, Seoul National University School of Dentistry, Seoul, Korea.
authors.forename: Tae-Il
authors.identifier: 0000-0003-4087-8021
authors.initials: TI
authors.lastname: Kim
keywords: Computer-assisted image interpretation; Gingiva; Optical coherence tomography; Periodontal pocket