How should cement be applied into an indirect restoration for proper delivery?

The application of a thin lining of cement to cover all internal walls of an indirect restoration is essential for achieving the best fit and long-term success of the prosthetic device. This technique ensures that there is adequate coverage and adhesion on all surfaces that will contact the tooth structure and the restoration. It allows the cement to fill in any microscopic discrepancies between the restoration and the tooth, reducing the risk of microleakage and improving the bonding strength.

Using a thick layer of cement can lead to excess material extruding from the restoration during seating, which could create voids and weaken the overall bond. Leaving the restoration unlined would compromise the adhesion that is necessary for the longevity and functionality of the restoration. Additionally, only coating the occlusal surfaces would not provide sufficient bonding across the entire internal surface, potentially leading to misfit and failure of the restoration. Thus, applying a thin layer of cement to cover all internal aspects promotes optimal retention and durability.