What type of grain is zinc phosphate type II?

Zinc phosphate type II is classified as a medium grain material. This designation refers to the particle size of the powder used in the formulation of zinc phosphate cement, which influences its physical properties and handling characteristics. Medium grain powders tend to offer a good balance between strength and workability, making them suitable for various dental applications, such as luting agents for crowns and bridges.

In dental materials, grain size can significantly affect the behavior of the material during mixing, setting, and overall performance in clinical situations. Medium grain powders provide enough surface area for proper interaction with liquid components while maintaining sufficient strength and setting speed, which is crucial for ensuring the integrity and longevity of the dental restoration.

Other options like coarse grain or fine grain would imply a distinct particle size that could lead to different properties, such as reduced strength or altered handling characteristics, which doesn't align with the intended uses of zinc phosphate type II.