Corrosion of silver cones in bone: a scanning electron microscope and microprobe analysis. 

By Zielke, Brady, del Rio

Date: 01/1976
Journal: JOE

Summary:  ​

  • Purpose: To examine with the scanning electron microscope and X-ray microanalyzer the surface changes of silver cones in the osseous tissue of the rat.​


  • Size 100 silver cones were cut into sections 2 mm long and autoclaved.​
  • Sections of silver cones were implanted in tibial bone wounds in 36 Sprague-Dawley rats. ​
  • Groups of six rats each were killed at monthly intervals up to 6 months then specimens were examined by SEM and by X-ray microanalysis.​
  • Channel windows were set to optimize counting of silver, sulfur, and chlorine peaks.​

Most highlighted Results:​

  • (78%) of silver cone materials were present within the implant site at the various sampling periods of the study.​
  • Implants were tightly bound by fibrous connective tissue, and were either partially or completely covered​ by the new bone.​
  • Silver and sulfur K𝜶 X-ray peaks were emitted from both the implant and the bone surface. ​
  • Sulfur and chlorine on the surface of the implant, relative to the amount of silver, increased to a maximum​ at three months after implantation.​
  • The results of the study indicate that the surface of a silver cone corrodes rapidly in bone​

Clinical significance:​

A reevaluation of the use of silver cone as a root canal filling material should be considered.​