Abstract
In order to estimate the influence of dental calculus on marginal bony changes in the interalveolar septa radiographically, inter-oral roentgenograms of 3002 teeth were observed.The roentgenograms were obtained from 166 dental patients with the bisecting-angle technique.The mean value of crestal bone height (bone score) on radiograms was less than 2.5 score units for each patient.
The results obtained implied that dental calculus probably take part in decrement in bony height of the interalveolar septa in the initial phase of bony loss.However, the calculus would not be a local factor from which V-type (Vertical or Wedge type) of bone defect in the septal margin originated, or if so, its effect seemed to be little.
