The preparation
Enough tooth removed for the material’s strength and no more; a smooth, continuous margin at the right level relative to the gum; and a shape that lets the crown seat fully. Done under magnification.
The margin
Where the crown meets the tooth. Open by a fraction of a millimetre, it traps plaque and decays the tooth underneath. Closed, it lasts for years. Digital scanning and milling are what make a closed margin routine.
The bite
A crown that is fractionally high concentrates force and fractures. The fitting appointment ends with the bite measured and balanced, not assumed.
