Dentinal Tubules at the Root Ends of Apicected Teeth: A Scanning Electron Microscopic Study

By Tidmarsh B, Arrowsmith M

Date: 01/1989
Journal: IEJ

Purpose:

Establish the existence and orientation of dentinal tubules at level which resection is usually performed to determine pathways of leakage in apicected teeth.

Materials/Methods:

  • N=22 total. 1st group=10 teeth of unknown age, 2nd group = 12 teeth of known age
  • 1st group: 2-4 mm removed at angles 45-60 degrees, sectioned roots longitudinally.
  • 2nd group had 12 teeth of known age. Full length of root canal exposed without resection.

Results:

  1. In all apicected teeth, all had varying degrees of dentinal tubules exposed.
  2. At 3mm from apex- There were a mean of 27,000 tubules per mm square found and near dentine-cementum junction, there were 13,000 tubules per mm square.

Clinical Significance:

Maintain bevel angle to a minimum due to exposure of dentinal tubules. Retrograde fillings should at least extend past the most coronal aspect of bevel to effectively seal exposed tubules.