Abstract
abstract— The purpose of this investigation was to study the topography of the principal bundles of the periodontal membrane. Untreated human premolars removed in conjunction with orthodontic treatment were fixed in 4% formaldehyde. The principal fiber bundles remaining on the root surface were examined. The fibers embedded in cementum were investigated by examining mineralized sections or sections progressively demineralized in 5.2% HNO3. In addition, conventional 5 μm, demineralized, paraffin embedded sections were employed. All specimens were coated under continuous tilting and rotation with a thin layer of carbon and gold‐palladium and finally examined in a scanning electron microscope. The principal fiber consisted of smaller, morphologic entities. In the cementum, the fiber bundles were discerned as individual structures and they exhibited a regular arrangement transversing the total width of the cementum. The fiber bundles branched towards the C‐D junction, rendering an irregular border between dentin and cementum. Within the fiber bundles smaller fibers connected longitudinal fibers at 90°.
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