Re: 3D medical modelling

From: Yasser Hosni (
Date: Mon Mar 18 2002 - 03:57:05 EET

At the University of Central Florida, Orlando, FL. we have done some impressive work in this area.

Yasser Hosni, Ph.D., PE.
IAMOT2002 Program Chair
Professor, Industrial Engineering and Management Systems
University of Central Florida
4000 Central Florida Blvd.
Orlando, FL 32816
Tel (407) 823-5817
Fax (407) 823-3413

>>> Andrew Layton <> 03/11/02 11:48AM >>>
There is work being done in this area by Shayne Kondor of the Georgia Tech
Research Institute.

His e-mail is

At 10:53 AM 3/10/2002 , wrote:

>I usually just read this list but couldn't resist putting my 2 cents worth in
>on the application of r-p in medicine. In my opinion, there is no question
>that the technology is available to transform the way we diagnosis and treat
>patients but the problem is more complex than just the technology. I would
>like to use a simple example that most of you can relate to. If your son or
>daughter went to the orthodontist to have his or her teeth straightened or
>face changed with skeletal surgery some very specific evaluations would be
>preformed. The following information is generally needed: photos of the face,
>two large x-rays of the head, models of the teeth and records of the way the
>TMJ (joints ) relate the jaws and teeth to each other. None of this
>information is digital (except possibly the photo) much of the process of
>making a diagnosis is done with a pencil on a sheet of acetate over the
>x-rays. This is a very scientific process and used by virtually all surgeons
>and orthodontists. Tracings are made of the bones of the face and teeth and
>their spatial relationship to each other measured and compared to known
>standards. Other measurements are made of the models and if jaw surgery is
>needed, acetate templates are cut of the tracings to rotate and move the
>teeth and bone in 2D (on the desk top) to determine the final result. If a
>surgeon is planning to move the jaws by cutting them and repositioning them
>in a new relationship, he usually mounts the models in an metal instrument
>that is like the jaws and cuts the plaster models to make the planned moves
>to see the final result before surgery. If the result is acceptable,
>autopolymerizing acrylic resin templates are made of the teeth to relate them
>together during surgery. This is accomplished using the TMJ (joints) as an
>axis of rotation and recording the number of degrees of rotation or opening
>to precisely position the cut jaw before plating it in place with titanium
>plates and screws.
>This is only a part of the process but I think it helps illustrate the
>present state of affairs. Now as you all know we could get a CT scan of the
>patient and have better information about the real soft and hard tissue
>anatomy of the patient, and we could scan the teeth or models of the teeth
>many ways and relate that scan date to the CT data. We could also record jaw
>movement digitally and allow for the scan data of the teeth and bones to be
>moved in CAD to the new desired position and we could make the surgical
>templates for positioning the teeth with r-p. None of these processes is a
>big deal and can be done easily. So why isn't everyone doing it?
>The answer to that question is the critical point. Oral and maxillofacial
>surgeons, orthodontists, plastic surgeons, neurosurgeons and a host of other
>people would love to have scanning, CAD and r-p do the jobs they presently do
>by hand but it will not happen until software is developed that does what
>they need easily and in a fashion that is similar to the present process.
>That will only happen when we create inter-relationships that allow
>engineers, surgeons, clinicians, researchers and marketing people to work
>together to develop the software we need.
>Generally, just providing conventional CAD and scanning equipment will not
>work. Most medical people are very busy, they do not have the time to learn
>Pro-e, they need someone else to do that for them.
>For more information about the rp-ml, see

Andrew C. Layton
Program Manager, Rapid Prototyping & Manufacturing Institute
Georgia Institute of Technology
813 Ferst Dr. N.W., Atlanta, GA 30332-0560
Phone: (404) 385-1053 Fax: (404) 894-0957

For more information about the rp-ml, see

For more information about the rp-ml, see

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