When a question about the tang or other things on a weapon is in question, it could be a good thing to go and see a vet. If you live in a big town the vet might consider you a loony, but if you live a bit out of town, it should be safe.
The thing is, that most of the vets have x-ray equipment big enough to x-ray a dagger or a hilt, and a dentist does not, besides a private hospital might very likely report you to the police, should you come with such a question, where as most of the vets are reasonable people – especially if you use them regally – instead of you own doctor that is
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But don't forget, what you will get, is a negative - not a positive picture - good luck.
Jens