* Misspelling or typo: Perhaps you meant "dental amalgam", which is a common dental filling material.
* Specific jargon: If you encountered this term in a particular context (e.g., a research paper, technical document), it could be a specialized term used in that specific field.
To get a clear answer, please provide more context:
* Where did you encounter this term?
* What is the subject matter you're researching?
With more information, I can help you understand what "DO amalgam" might refer to.