Technical question about using a dental drill

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dentprincess

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So, I recently got to use a dental drill on some form of dental mold of teeth. Is that the correct term? It wasn't plastic, and I don't know the material is. We had to follow the tooth's structure and drill a hole.

Can anyone help me figure this out?
 
Plaster or stone? I'm confused with the question
 
The teeth were likely made out of ivorine.
 
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