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CT scans for dental applications

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  • CT scans for dental applications

    Dear all,

    I' m working on finite element modelling of the upper and lower jaw for
    patients with implant-supported oral prostheses. Because the FE models
    have to be patient-dependent they are based on CT: both the anatomy as the
    bone density (elastic modulus) must be implemented correctly. By means of
    the FE results we want to have an idea whether observed bone density
    changes around the implants in the patient's jaw can be correlated to the
    calculated stress or strain distribution in the bone.

    For the evaluation of bone density changes we want to take two CT scans of
    the patient's jaw and compare the Hounsfield values: one preoperatively and
    one postoperatively (after 9-12 months of function). I was wondering if
    this sounds like a good idea to do. Does anyone of you have experience
    with the use of CT scans for this purpose? Because maybe the resolution of
    CT is too low to see anything of interest. The CTs for dental applications
    are taken with a slice interval of 0.5 mm and have a resolution (pixel
    size) of 0.25 mm.

    Another problem might be that the presence of the titanium implants on the
    postoperative CT will bias the Hounsfield value of bone in the immediate
    vicinity of the implants so that these value will not be reliable. Has
    this effect already been documented in literature? And are there solutions
    to solve that problem?

    Last but not least the preoperative and postoperative CT have to be
    matched. Because the patient's position will not be identical during the
    preop and postop scan reslicing has to be performed in order to match the
    images. Does anyone know where I can find the necessary software (maybe as
    shareware) to perform this matching? Or can I find information in
    literature on matching algorithms?

    All information on these topics will be very helpful. Thanks in advance
    for your help.


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