The Exchange Principle

The Exchange Principle states that for a transaction to occur, something of value must be involved from both parties. Essentially, when two people exchange items, both give up something and gain something in return, leading to a fair trade. In dentistry, this means that when an impression material is replaced with a cast, the materials are transferred or exchanged between the impression and the cast, ensuring the final model accurately reflects the patient's mouth. It emphasizes that every exchange involves a reciprocal transfer, maintaining accuracy and balance in the process.