Final answer:
Micro-filled resins have filler particles less than 0.1 µm, mini-filled resins have particles between 0.1 to 1 µm, midsize-filled resins have 1 to 10 µm particles, and macro-filled resins have particles larger than 10 µm.
Step-by-step explanation:
The size of the filler particles in various composite resins is an important characteristic that impacts the material's properties. In micro-filled resins, the filler particles are typically less than 0.1 micrometers (µm) in size. Mini-filled resins contain particles that are slightly larger, usually between 0.1 to 1 µm. Midsize-filled resins have particles in the range of 1 to 10 µm. Lastly, macro-filled resins consist of the largest particles, which are larger than 10 µm. These different sizes impact the mechanical properties, esthetics, and handling characteristics of the resin composites.