All things dental milling
Ever wonder why those crowns that are from an in office mill lack anatomy and often do not fit as well? Me too. This is a work in progress and is just my notes for now.
Dental milling limitations
Whenever milling a dental crown or framework you have limitations due to the size of the bur head. So the exact same crown that we print in wax and then press will have more much anatomy than one that we just send straight to the mill. There are also margin variances and cement gap variances that make the crown from the mill worse as well.
When milling the cement gap is larger because the intaglio must be over-milled to allow the crown to seat. The smaller the bur size the less of a problem this is but to make the mills go faster (like an in office mill) the burs are larger. Cement thickness has a negative impact on crown strength.