Int J Med Robot - Generation of mineral density distribution maps from subject-specific models of mandibles - a preliminary study.

Tópicos

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Resumo

CKGROUND: Determination of the mineral content of bone and its distribution by computed tomography (CT) enables one to define the insertion points for prosthetic devices, or determine the degree of healing in cases of fracture or surgical intervention. The use of subject-specific models allows mapping of the spatial structure and the mineral content of the bone graphically and quantitatively.METHODS: Subject-specific models and mineral density maps from pig jaws were developed using segmentation, transcription tools and finite element analysis software. This study considered six frozen heads from pigs aged 10-12 months, and phantom solutions of K(2) HPO(4) . The predicted bone mass of each jaw was compared with its respective ash mass after incineration.RESULTS: The tridimensional maps show highest density values at the molar cusp and within the symphysis. The average percentage error relative to the mineral density maps was -18.4%. The radiation dose was reduced by a factor of eight from the recommended maximum without compromising the precision of the models.CONCLUSIONS: The computed tridimensional mineral density maps illustrate, numerically and graphically, the spatial distribution of the density field within the mandibular bone. These maps could facilitate the location of insertion points or determine the evolution of the mineralization level of a patient's bone tissue.

Resumo Limpo

ckground determin miner content bone distribut comput tomographi ct enabl one defin insert point prosthet devic determin degre heal case fractur surgic intervent use subjectspecif model allow map spatial structur miner content bone graphic quantitativelymethod subjectspecif model miner densiti map pig jaw develop use segment transcript tool finit element analysi softwar studi consid six frozen head pig age month phantom solut k hpo predict bone mass jaw compar respect ash mass incinerationresult tridimension map show highest densiti valu molar cusp within symphysi averag percentag error relat miner densiti map radiat dose reduc factor eight recommend maximum without compromis precis modelsconclus comput tridimension miner densiti map illustr numer graphic spatial distribut densiti field within mandibular bone map facilit locat insert point determin evolut miner level patient bone tissu

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