What is a significant disadvantage of porcelain-fused-to-metal (PFM) crowns compared to resin-bonded restorations?

Porcelain-fused-to-metal (PFM) crowns are known for their strength and durability, making them a popular choice in restorative dentistry. However, a significant disadvantage of PFM crowns compared to resin-bonded restorations is the removal of tooth structure.

When placing a PFM crown, it's essential to prepare the tooth by reducing its structure to create enough room for the metal framework and ceramic material. This reduction can often be more extensive than that needed for resin-bonded restorations, which typically require less invasive preparation. Resin-bonded restorations, also known as bonded bridges or Maryland bridges, often require minimal tooth reduction, preserving more of the natural tooth structure. This preservation is particularly advantageous for maintaining the integrity and health of the tooth, allowing for improved function and aesthetics while minimizing the risk of complications such as pulp exposure or increased sensitivity.

The impact of removing significant tooth structure with PFM crowns not only affects the immediate state of the tooth but can also influence long-term outcomes, such as the potential need for future root canal therapy if the tooth becomes compromised. Therefore, the preparation requirements of PFM crowns represent a critical consideration in treatment planning, particularly in minimally invasive dentistry.