What is the width of margin for the complete cast crown?

The correct width of the margin for a complete cast crown is typically 1 mm. This measurement is critical because it provides the necessary strength and retention for the crown while allowing for adequate finish and sealing at the margin. A 1 mm margin helps to ensure that there is enough thickness to create a durable restoration that can withstand occlusal forces and resist fracture.

Additionally, a wider margin may not necessarily provide additional benefits and could complicate the crown's placement, while a narrower margin might increase the risk of porcelain chipping or compromised integrity. Therefore, the standard of 1 mm for a complete cast crown is grounded in practical dental principles focused on long-term performance and patient safety.