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The use of a coin shaped implant for direct in situ measurement of attachment strength for osseointegrating biomaterial surfaces

Paper ID Volume ID Publish Year Pages File Format Full-Text
13771 900 2002 9 PDF Available
Title
The use of a coin shaped implant for direct in situ measurement of attachment strength for osseointegrating biomaterial surfaces
Abstract

Most animal models currently used to study the retention of implants in bone are influenced by shear forces introduced during the retention test. This is mainly due to the implant design, which most often are cylindrical, conical or threaded. In these models interlocking between bone and implant surface will increase the effect of genuine bone bonding and thus give a false positive outcome. The purpose of the present study was to establish a model for testing functional attachment of implants in situ, with minimal influence of interlocking and shear forces. The model involves the use of flat coin shaped implant placed onto the cortical bone of rabbit tibia without mechanical fixation to the bone. The implant is passively retained on the cortical bone by a titanium band retainer. During the healing period, the contact between the coin shaped implants and the bone is restricted to the flat test surfaces. To prevent interlocking effects from lateral bone attachments a polytetrafluoroethylene (PTFE) cap covering the vertical and the upper faces of the implants were used. The tensile test was performed with a gradual, calibrated pull, perpendicular to the bone–implant interface. This pullout model makes it possible to study the kinetics and strength of bone bonding with negligible influence of shear forces or mechanical interlocking.

Keywords
Biomaterials; Attachment strength; Surface roughness; Tensile testing; Bone bonding; Perpendicular forces; Titanium implants; Animal model
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The use of a coin shaped implant for direct in situ measurement of attachment strength for osseointegrating biomaterial surfaces
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 10, May 2002, Pages 2201–2209
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us