DPI alloy is a mixture of metals, including silver, tin, and copper, with mercury. The mercury in amalgam alloy binds the other metals together to form a strong and durable filling material. One of the key benefits of DPI fine grain silver alloy is its ability to bond well to tooth structure, which can help to create a strong and durable restoration. It is also known for its excellent marginal fit, meaning that it can be shaped to fit the contours of the tooth precisely, resulting in a restoration that looks and feels natural. It contains silver which is an effective anti-caries agent.