Gillmore (1825–1888), American engineer] A device which uses a penetration test to measure the difference between the initial and final setting time of dental cement. A ¼ pound needle is used for determining the initial set and a one pound needle is used for defining the final set.

What is the use of Gillmore needle apparatus?

Gillmore Needle Apparatus is used to determine initial and final set times of Portland cement, masonry cement, hydraulic hydrated lime, and certain mortars in accordance with ASTM C266 and other standards.

What is importance of setting time of cement?

The significance of Setting Time for Cement. When cement is mixed with water, it hydrates and makes cement paste. This paste can be molded into any desired shape due to its plasticity. Within this time cement continues with reacting water and slowly cement starts losing its elasticity and starts to harden.