Use a reamer that will match the selected screw post. The root canal should be enlarged with the reamer and deepened to desired depth. Eccentric movement of reamer should be avoided.
Using key, the post should be screwed into the root to check the length of the canal. When this is done remove the screw post.
After cleaning and drying the root canal and the post, the post is dipped into cement and screwed home. A screw placed in the mesial and distal canals gives a good anchorage. Screw posts give this possibility, because of the good variation in sizes.