Hi John,
Since you are asking for the best man-made material to be used as a nasal implant, I will assume that you do not have any of your own nasal septal or ear cartilage available.
I have used both Medpor (made by Porex, see web link below) and Gortex in the past in less than a handful of patients. They all have done very well without warping, infection, or the need for removal. The aesthetic results are very good, but not perfect.
The other alternative is your own rib cartilage, but even the best hands it may warp as well.
Good luck and be well.
Dr. P



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