CT Plus 3D printing creates tailor-made temporary middle ear bones – tech2.org

CT Plus 3D printing creates tailor-made temporary middle ear bones


Computed tomography scans and 3D printing can create accurate prosthetic replacements tailored to damaged parts of the middle ear, according to a study presented at RSNA.

The researchers explored whether personalized 3D printing would be an individualized prosthesis. a possible solution for the wide range of anatomical variation found in the pathological middle ear, and could decrease the postoperative prosthesis displacement rate by increasing the likelihood of an appropriate adjustment, in addition to decreasing the surgical time.

"Ossicles are very small structures, and one reason why surgery has a high failure rate is due to the incorrect size of the prosthesis," co-author Jeffrey D. Hirsch, MD, badistant professor of radiology at the School of Medicine at the University of Maryland (UMSOM) in Baltimore, said in a statement. "If I could tailor a prosthesis with a more accurate fit, then the procedure should have a higher success rate."

Researchers removed the anvil from three cadaveric human human temporal bones fixed with formalin without macro or microscopic evidence of pathology. Cadaveric bone images were obtained using a standard temporal bone CT protocol. A customized prosthesis was designed for each cadaverous human temporal bone and then fabricated on a 3D printer. Four surgeons then performed the insertion of each prosthesis in each middle ear, blinded to the bone of and for which each was designed. The surgeons were then asked to link each prosthesis with its correct original bone.

The results showed that each prosthesis had unique measurements and each of the four surgeons could correctly match the prosthesis model with the desired temporal bone. The chances of this occurring at random are 1: 1296, the researchers reported.

"This study highlights the central strength of three-dimensional printing: the ability to accurately reproduce anatomical relationships in space at a submillimeter level," Hirsch said. "With these models, it's almost a lace."

Implant of printed prostheses in 3D. © RSNA 2017.

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