Surgical Solutions - March-May 2017 - 31
I M P L A N T S TA B I L I T Y
ISQ & Bone to Implant Contact
What is Bone to Implant Contact (BIC)?
Bone to implant contact (BIC) is the percentage of the implant surface in contact with bone
on a microscopic level.
How do
you know it
is time
to load?
Young's modulus, stability and
micromotion
If the E-modulus (Young's modulus)
is high, in any material, it means
that the material stiffness is high. If
a tapered screw is screwed into hard
wood for instance, the stability will
be high due to the relatively high
stiffness of the wood. Such a screw
will move very little when subjected
to forces (low micromotion) even if
the "screw-to-bone" contact might be
in the range of 50 % or lower. Even
if the screw is glued in place and thus
increasing the "screw-to-bone" contact to 100 %, the stability will not
increase significantly since the stability was already high from the beginning. This reasoning is valid for practically all solid materials,
including dense bone. For the reasons above, BIC does not have a linear correlation with implant
stability. Osstell (RFA) measures the implant stability by measuring the stiffness in the interface
between the implant and the bone which in turn is a measurement of the micro mobility (µm /N).
In soft to medium bone
When the initial stability is low to
medium, osseointegration will change
the bone around the implant so that
the stability and stiffness increases
(and also BIC). In this case, there will
be a good correlation between ISQ
and BIC.
Upgrade your ISQ
unit to IDX and
receive 20% off
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Osstell AB Stampgatan 14 - SE 411 01 Göteborg - Sweden - Tel +46 31 340 8250
Fax +46 31 413 115 - E-mail info@osstell.com - www.osstell.com
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In dense bone
When the initial stability is high (e.g.
above 75 ISQ), osseointegration will
not add stability to the implant in
a significant way. Even if the BIC is
increasing, the implant stability will
not change much, which is reflected
by the ISQ value. In this case, the correlation between BIC and ISQ will be poor.
31
http://www.osstell.com
Table of Contents for the Digital Edition of Surgical Solutions - March-May 2017
Contents
Surgical Solutions - March-May 2017 - 1
Surgical Solutions - March-May 2017 - Contents
Surgical Solutions - March-May 2017 - 3
Surgical Solutions - March-May 2017 - 4
Surgical Solutions - March-May 2017 - 5
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Surgical Solutions - March-May 2017 - 40
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