Why is there such a cost difference between 3M ESPE Lava Chairside Oral Scanner C.O.S. and iTero, and CEREC AC and E4D Dentist?

3M ESPE Lava Chairside Oral Scanner C.O.S. and iTero are strictly digital impression systems (scanner only); whereas, CEREC AC and E4D Dentist are complete CAD/CAM systems – the higher price reflects the price of the mill. However, with the introduction of E4D Sky (D4D Technologies) and CEREC Connect (Sirona Dental Systems), both companies now provide an option to purchase the scanner only, which brings down the cost. Some doctors are finding a need to have both the ability to mill in office as well as utilize a remote option, depending on the type of restoration being fabricated.