PubMed Health⌕ Search

Biomedical subjects

U Kliegis

Publications and source records attributed to U Kliegis.

7 recordsLinked to original sources
PubMed1997

[Precision of 3D-assisted surgical planning with rapid prototype techniques].

Our clinical results show that 3D model building is an excellent method for 3D preoperative planning. Dependent on the number of steps, however, there are many possibilities of failures. Standardization and quality control of data acquisition and industrial manufacturing must be recommended. This is especially important for stereolithography, as it is definitely more complex than the milling technique. One possibility seems to be the use of phantom models. Another factor is that the surgeon has to be involved in the essential steps of data analysis and segmentation. Based on our experience, the building of 3D CT skull models is a clinically efficient method that is mature enough for clinical use, but cannot yet be accepted as the clinical routine. Quality assurance is urgently necessary.

Equipment Design↗
PubMed1997

[Video matching as intraoperative navigation aid in operations to improve the facial profile].

Planning and simulation of individual interventions are not yet the common standard treatment in general surgery. Improvements in planning and simulation of individual orthognatic and craniofacial interventions have led to the need to transfer the results of preoperative planning to the location. Videomatching offers a new approach to the surgeon so that simulation output can be used in a highly intuitive way. Congruent video superimposition of the real site and a view of the simulation give the surgeon a unified view of both domains. Visual merging is immediately accepted by the surgeon who prefers the intuitive, non-tactile nature of this highly informative navigational aid. Application and positioning of anatomical markers and time-consuming calibration procedures can be reduced to a minimum. Alternative plans can be discussed among several surgeons preoperatively, and different therapeutic concepts solidified in various simulation models can be selected intraoperatively. We concentrate on the application of this new method in craniomaxillofacial surgery, but it is applicable in other disciplines as well.

Calibration↗
PubMed1995

Individual model fabrication in maxillofacial radiology.

Oral and maxillofacial surgery has long needed a methodology for accurate definition of the third dimension. The introduction of computer-aided tomography in the 1970s provided surgeons with multiple 2-D maps which they themselves had to conceptualize into a third dimension. The later advent of computerized summation of these data made it possible to display a perspective view of the third dimension on a TV monitor. CT, and more recently MRI, with the further analytical refinement afforded by software processing (interactive data presentation, contour detection and summation, hypothetical 3-D construction and interactive visualization) now provide the basic information that is needed for the fabrication of an individual model. Such models can be milled from a variety of materials. More recently, laser-hardened acrylic resins have been shown to be a useful alternative. Both systems are described and their advantages and disadvantages in the planning and performance of oral and maxillofacial surgical procedures are discussed.

Acrylic Resins↗