36 research outputs found
Computer-aided position planning of miniplates to treat facial bone defects
In this contribution, a software system for computer-aided position planning
of miniplates to treat facial bone defects is proposed. The intra-operatively
used bone plates have to be passively adapted on the underlying bone contours
for adequate bone fragment stabilization. However, this procedure can lead to
frequent intra-operatively performed material readjustments especially in
complex surgical cases. Our approach is able to fit a selection of common
implant models on the surgeon's desired position in a 3D computer model. This
happens with respect to the surrounding anatomical structures, always including
the possibility of adjusting both the direction and the position of the used
osteosynthesis material. By using the proposed software, surgeons are able to
pre-plan the out coming implant in its form and morphology with the aid of a
computer-visualized model within a few minutes. Further, the resulting model
can be stored in STL file format, the commonly used format for 3D printing.
Using this technology, surgeons are able to print the virtual generated
implant, or create an individually designed bending tool. This method leads to
adapted osteosynthesis materials according to the surrounding anatomy and
requires further a minimum amount of money and time.Comment: 19 pages, 13 Figures, 2 Table
Illustration of the baseline determination.
<p>The direction vector <i>D</i> (green) is set up parallel to the initial point's (red star) direction vector (green). The direction vector is perpendicular to the initial point's normal vector (purple). The origins of the cast rays (brown) are translated along the direction vector and checked for intersections.</p
Results from the evaluation questionnaire for each subject using a six point Likert rating.
<p><i>Median</i> is the median value of the four subjects and <i>Error</i> describes the superimposed standard error. <i>Q11</i> is a <i>yes/no</i> question where <i>no</i> equals a value of <i>zero</i> and <i>yes</i> equals a value of <i>6</i>. The time <i>T</i> is measured in minutes.</p
Bridge building principle with triangulation.
<p>Green crosses mark the corner of the ring element's plane side. To each baseline point (green points) a rectangle (light blue lines) is constructed. Rectangle triangulation, spanned by the two starting nodes (<i>N1</i> and <i>N2</i>) and two opposing nodes of the previous constructed rectangle (<i>N3</i> and <i>N4</i>). Node <i>N1</i>, <i>N3</i> and <i>N4</i> build a triangle <i>T2</i>, and Nodes <i>N1</i>, <i>N2</i> and <i>N3</i> build the second triangle <i>T1</i>.</p
Image of real patient x-ray data suffering from a mandibular angle fracture (left angle).
<p>Left image shows the untreated defect. The result of the treatment with applied miniplates after bone repositioning is shown on the right part of the figure.</p
Summary of results according to the trauma database due to facial injuries caused by ski accidents in Innsbruck (Department of Oral and Maxillofacial Surgery, Innsbruck, Austria).
<p>Summary of results according to the trauma database due to facial injuries caused by ski accidents in Innsbruck (Department of Oral and Maxillofacial Surgery, Innsbruck, Austria).</p
Computer-aided position planning of miniplates to treat facial bone defects - Fig 12
<p>Example result containing all three available implants each located at a position where they generally are applied (left). For better illustration, the single implants are extended portrayed as well on the right side. The plate could easily be positioned according to the underlying bone contours by the used software module.</p
Constructed network using the MeVisLab prototyping environment, including self-implemented modules named <i>CurvatureCalc</i> for baseline calculation and <i>ImplantGen</i> for generating the implant models.
<p>Constructed network using the MeVisLab prototyping environment, including self-implemented modules named <i>CurvatureCalc</i> for baseline calculation and <i>ImplantGen</i> for generating the implant models.</p
Flow chart of a miniplate generation process separated in three main parts: Orange marks the data acquisition, grey the implant set-up including the baseline calculation and apricot the implant generation and visualization.
<p>Flow chart of a miniplate generation process separated in three main parts: Orange marks the data acquisition, grey the implant set-up including the baseline calculation and apricot the implant generation and visualization.</p