What is the minimal axial reduction required for crowns?

The minimal axial reduction required for crowns is crucial for ensuring sufficient space for the crown material and maintaining the tooth's structural integrity. A reduction of 1.5 mm is typically recommended as it allows for adequate thickness of various types of crown materials, including ceramics and metal-ceramics. This thickness is essential for providing the necessary strength, durability, and aesthetic qualities of the final restoration.

In clinical practice, achieving this amount of reduction also helps to minimize the risk of tooth sensitivity post-restoration and allows for proper adaptation of the crown to avoid compromising the periodontal health around the tooth.

Different materials have different requirements, but 1.5 mm is a standard guideline that balances the needs for strength and coverage without overly compromising the tooth structure. Reductions below this amount may result in crowns that are prone to fracture or wear indicated by insufficient material thickness.