An in-vivo method for functional attachment messurements in bone anchored implants.
Hans Jacob Rønold & Jan Eirik Ellingsen
Presentation by Elisabeth A. Riksen
Department of Prosthodontics and Oral Function, and Oral Research Laboratory, Dental Faculty, University of Oslo, Norway
Many factors are involved in the incorporation of implants in bone tissue. The surface roughness on micro and macro level as well as the chemical composition of the implants has been demonstrated in several studies to be of significance for bone-implant integration. The optimal surface roughness on the micrometer level concerning bone-implant integration is, however, not identified yet. The purpose of the present study is to describe the construction and operation of test equipment for testing functional attachment of implants in-vivo by pull-out test. The model was developed using coin shaped implants, 6.25 mm in diameter, which were implanted into rabbit tibia. Twenty implants with the same surface treatment i.e TiO2 grain sizes of 22-28µm. Before insertion the implants were covered with a teflon cap and retained with a titanium band. Healing period was 8 weeks. A visual topographical characterisation was performed with SEM and CLM before insertion. To avoid shear and tilt forces a metal pin with 'ball-attachment' was screwed in the implant. Tibia was fixated in a special designed jig to stabilise the bone during the pull-out procedure.
The test was performed with Lloyds LRX Materials testing machine, using a 500 N load cell.
No statistical difference was found testing the twenty implants.
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