An Investigation of Bonding Mechanisms at the Interface of a Prosthetic Material.
Abstract
The surface chemical behavior of bioglass containing soda-calcia-silica and variable percentages of phosphorous has been investigated. Many techniques: infrared reflection spectroscopy, ion solution analysis, scanning electron microscopy, energy dispersive x-ray analysis, x-ray diffraction, Auger electron spectroscopy, ion beam milling, were used. Surface ion concentration profiles determined with Auger spectroscopy and ion beam milling detail the structural alterations produced by aqueous attack and in vivo exposure. Organic constituents C and N, not present in the bioglass, are found incorporated into the reactive surface of bioglass for distances up to 1800 A. A mechanism is postulated which explains the sequence of events leading to the formation of the multiple-layer corrosion structures in vivo. Stable interfacial fixation results when bioglasses are implanted in bone, provided good initial fixation is obtained. Based upon the in vivo observations, a theory is proposed that an ideal implant material must have a dynamic surface chemistry that induces histological changes at the implant surface which would normally occur if the implant were not present. An in vivo proof test of bonding ability has been developed and used to show that this bond forms consistently. The same test is presently being used to determine the range of bioglass compositions capable of forming a bond to bone. A new technique of coating stainless steel with bioglass has been used to produce implants which form bonds with bone as readily as bulk bioglass.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA041962
Entities
People
- George Piotrowski
- Homer A. Paschall
- L. L. Hench
- William C. Allen
Organizations
- University of Florida