Abstract
The recreation of bone structures from the human body has very complex geometry and a lack of symmetry. A small series of vertebrae replications, digitized by computed tomography, could serve in exercises for medical students to help them perform operational planning for inserting implant structures, cage type implants, or screws and rods implants. Additionally, these replications could be used in the planning of extraordinary clinical cases, for example complex vertebrae deformities. The replicated structure could be fulfilled in a 1:1 ratio or scaled. For the selection of an appropriate production technology a block diagram is followed which considers suitable technologies for the production of polymer parts, compared to the series size and the complexity of the geometry. Both criteria must be taken into account when considering which technology should be used in the production of polymer parts. Comparing the advantages and disadvantages of additive technologies and replication in silicone mold, the best choice for technology is set to be replication in silicone mold. The initial preparation for the manufacture of the silicone mold includes a detailed analysis of the geometry of the model for replication. The first step includes defining the runner place as well as mounting the runner to the model. To ensure the mold is completely filled while casting, positive-shaped vents in the mold are defined. Because of the complex shapes of the spinal vertebrae and the need to take out elements in many directions, the mold is divided into multiple parts. A block-diagram that summarizes the entire manufacturing cycle for replication in a silicone mold is developed.
Highlights
Producing a part with complex geometry is always a challenging task, especially when it has to be achieved with high accuracy
In order to recreate an element of the human body, the element should first be digitalized by making a computed tomography scan and the data processed with specialized software
The manufacture of a small series (50 pieces) of spinal replications, previously digitalized by computed tomography, is shown in the current research. Such sets of polymer replications can be used in exercises for medical students, to help them perform surgical planning for implant replacement of damaged lumbar intervertebral disc or to produce physical models of complex deformities
Summary
Producing a part with complex geometry is always a challenging task, especially when it has to be achieved with high accuracy. The manufacture of a small series (50 pieces) of spinal replications, previously digitalized by computed tomography, is shown in the current research. Such sets of polymer replications can be used in exercises for medical students, to help them perform surgical planning for implant replacement of damaged lumbar intervertebral disc or to produce physical models of complex deformities. Using such models as a template, the appropriate shape of the plate-rod construct could be created in advance and inserted into the injured area.
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