What is the typical range of the Knoop Hardness Number (KHN) for microfilled composite restorative materials?

Explanation

Microfilled composite restorative materials generally exhibit a Knoop Hardness Number between 50 and 60 KHN, which indicates their surface hardness. Other types of composites show lower hardness values, such as 25–35 KHN or 15–20 KHN, depending on their composition.