An experimental study to investigate biomechanical aspects of the initial stability of press-fit implants

S. Berahmani, D. Janssen, S. van Kessel, D. Wolfson, M.C. De Waal Malefijt, P. Buma, Nicolaas Jacobus Joseph Verdonschot

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

Abstract

Initial fixation of press-fit implants depends on interference fit, surface morphology, and bone material properties. To understand the biomechanical effect of each factor and their interactions, the pull-out strength of seven types of CoCrMo tapered implants, with four different interference fits, three different surface morphologies (low, medium and high roughness), and at two time points (0 and 30 min) were tested in trabecular bone with varying density. The effect of interference fit on pull-out strength depended on the surface morphology and time. In contrast with our expectations, samples with a higher roughness had a lower pull-out strength. We found a similar magnitude of bone damage for the different surface morphologies, but the type of damage was different, with bone compaction versus bone abrasion for low and high frictional surfaces, respectively. This explains a reduced sensitivity of fixation strength to bone mineral density in the latter group. In addition, a reduction in fixation strength after a waiting period only occurred for the low frictional specimens. Our study demonstrates that it is essential to evaluate the interplay between different factors and emphasizes the importance of testing in natural bone in order to optimize the initial stability of press-fit implants.
Original languageEnglish
Pages (from-to)177-185
Number of pages9
JournalJournal of the mechanical behavior of biomedical materials
Volume42
DOIs
Publication statusPublished - 2015

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Bone
Surface morphology
Surface roughness
Abrasion
Minerals
Materials properties
Compaction
Testing

Keywords

  • METIS-310852
  • IR-100588

Cite this

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title = "An experimental study to investigate biomechanical aspects of the initial stability of press-fit implants",
abstract = "Initial fixation of press-fit implants depends on interference fit, surface morphology, and bone material properties. To understand the biomechanical effect of each factor and their interactions, the pull-out strength of seven types of CoCrMo tapered implants, with four different interference fits, three different surface morphologies (low, medium and high roughness), and at two time points (0 and 30 min) were tested in trabecular bone with varying density. The effect of interference fit on pull-out strength depended on the surface morphology and time. In contrast with our expectations, samples with a higher roughness had a lower pull-out strength. We found a similar magnitude of bone damage for the different surface morphologies, but the type of damage was different, with bone compaction versus bone abrasion for low and high frictional surfaces, respectively. This explains a reduced sensitivity of fixation strength to bone mineral density in the latter group. In addition, a reduction in fixation strength after a waiting period only occurred for the low frictional specimens. Our study demonstrates that it is essential to evaluate the interplay between different factors and emphasizes the importance of testing in natural bone in order to optimize the initial stability of press-fit implants.",
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year = "2015",
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journal = "Journal of the mechanical behavior of biomedical materials",
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An experimental study to investigate biomechanical aspects of the initial stability of press-fit implants. / Berahmani, S.; Janssen, D.; van Kessel, S.; Wolfson, D.; De Waal Malefijt, M.C.; Buma, P.; Verdonschot, Nicolaas Jacobus Joseph.

In: Journal of the mechanical behavior of biomedical materials, Vol. 42, 2015, p. 177-185.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - An experimental study to investigate biomechanical aspects of the initial stability of press-fit implants

AU - Berahmani, S.

AU - Janssen, D.

AU - van Kessel, S.

AU - Wolfson, D.

AU - De Waal Malefijt, M.C.

AU - Buma, P.

AU - Verdonschot, Nicolaas Jacobus Joseph

PY - 2015

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AB - Initial fixation of press-fit implants depends on interference fit, surface morphology, and bone material properties. To understand the biomechanical effect of each factor and their interactions, the pull-out strength of seven types of CoCrMo tapered implants, with four different interference fits, three different surface morphologies (low, medium and high roughness), and at two time points (0 and 30 min) were tested in trabecular bone with varying density. The effect of interference fit on pull-out strength depended on the surface morphology and time. In contrast with our expectations, samples with a higher roughness had a lower pull-out strength. We found a similar magnitude of bone damage for the different surface morphologies, but the type of damage was different, with bone compaction versus bone abrasion for low and high frictional surfaces, respectively. This explains a reduced sensitivity of fixation strength to bone mineral density in the latter group. In addition, a reduction in fixation strength after a waiting period only occurred for the low frictional specimens. Our study demonstrates that it is essential to evaluate the interplay between different factors and emphasizes the importance of testing in natural bone in order to optimize the initial stability of press-fit implants.

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