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Journal of Prosthetic Dentistry
Research Article| Volume 32, ISSUE 1, P7-12, July 1974

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Studies of residual ridge resorption. Part I. Use of panoramic radiographs for evaluation and classification of mandibular resorption

  • Author Footnotes
    * Associate Professor, Department of Prosthodontics, Loma Linda University, Loma Linda, Calif.
    ,
    Author Footnotes
    1 Dr. Wical Loma Linda University School of Dentistry Loma Linda, Calif. 92354.
    Kenneth E. Wical
    Footnotes
    * Associate Professor, Department of Prosthodontics, Loma Linda University, Loma Linda, Calif.
    1 Dr. Wical Loma Linda University School of Dentistry Loma Linda, Calif. 92354.
    Affiliations
    University of Washington, School of Dentistry, Seattle, Wash., U.S.A.
    Search for articles by this author
  • Author Footnotes
    ** Professor, Department of Prosthodontics, University of Washington, Seattle, Wash.
    ,
    Author Footnotes
    2 Dr. Swoope University of Washington School of Dentistry Seattle, Wash. 98195.
    Charles C. Swoope
    Footnotes
    ** Professor, Department of Prosthodontics, University of Washington, Seattle, Wash.
    2 Dr. Swoope University of Washington School of Dentistry Seattle, Wash. 98195.
    Affiliations
    University of Washington, School of Dentistry, Seattle, Wash., U.S.A.
    Search for articles by this author
  • Author Footnotes
    * Associate Professor, Department of Prosthodontics, Loma Linda University, Loma Linda, Calif.
    1 Dr. Wical Loma Linda University School of Dentistry Loma Linda, Calif. 92354.
    ** Professor, Department of Prosthodontics, University of Washington, Seattle, Wash.
    2 Dr. Swoope University of Washington School of Dentistry Seattle, Wash. 98195.
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      Abstract

      This article describes a method of estimating the severity of mandibular bone resorption by using the mental foramen and the inferior border of the mandible, as they appear in panoramic radiographs, as reference points.
      Measurements of 260 images in panoramic radiographs of normal mandibles reveal that, in a high percentage of films, regardless of the usual magnification or distortion of the images, the lower edge of the mental foramen lies very close to a line dividing the mandible into thirds. By using the approximate ratio of 3:1, the original height of the mandible can be conveniently estimated from the height of the lower edge of the foramen above the inferior border of the mandible. The reduction in height of the bone can then also be estimated.
      It is suggested that this method of estimating and describing the degree of bone resorption may facilitate the study of this disease by providing an anatomic basis for classifying or grouping patients affected to varying degrees.
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