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A morphometric and biomechanic comparison of titanium implants inserted in rabbit cortical and cancellous bone.

Artikel i vetenskaplig tidskrift
Författare Lars Sennerby
Peter Thomsen
Lars Ericson
Publicerad i The International journal of oral & maxillofacial implants
Volym 7
Nummer/häfte 1
Sidor 62-71
ISSN 0882-2786
Publiceringsår 1992
Publicerad vid Odontologiska institutionen
Institutionen för de kirurgiska disciplinerna, Avdelningen för biomaterialvetenskap
Institutionen för anatomi och cellbiologi
Sidor 62-71
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Animals, Bone Density, Bone and Bones, anatomy & histology, physiology, Knee Joint, physiology, Osseointegration, Prostheses and Implants, Rabbits, Rotation, Stress, Mechanical, Titanium
Ämneskategorier Biomaterialvetenskap

Sammanfattning

The removal torques for screw-shaped pure titanium implants inserted in rabbit tibia and the femoral part of the knee joint and the tissue response to these implants, as quantitated with light microscopic morphometry on ground sections, were compared after 6 weeks, 3 months, and 6 months. The bone surrounding the femoral intra-articular implants was mostly cancellous, while cortical bone was formed around the tibial implants. The torque needed to remove the intra-articular implants increased with time, but there was no such increase for the tibial implants. At 6 weeks, significantly less torque was needed to remove the intra-articular implants in spite of the fact that significantly more bone was found in the threads of these implants as compared with the tibial implants. When calculating the amount of bone in threads situated in the cortical and subchondral passage, more was found in the threads of the tibial implants, which corresponded to the higher removal torque. Additional light microscopic observations on implants unscrewed after 12 months in rabbit tibia indicated that rupture occurred between the implant surface and calcified bone. Findings indicate that the resistance to unscrewing is dependent on the amount of compact bone surrounding a titanium implant.

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