What is the ideal length for a post in a post-core for an endodontically treated tooth?

The ideal length for a post in a post-core for an endodontically treated tooth should be approximately 1.5 times that of the crown. This guideline is based on the need to ensure adequate retention and support for the restoration. A post that is longer than the crown allows for better anchorage within the remaining tooth structure, which is crucial for distributing occlusal forces effectively. Additionally, this length helps to achieve a balance between retention and the preservation of dentin, minimizing the risk of fracture in the restored tooth.

While lengths such as 2/3 of the tooth length or 1/2 of the tooth length may be referenced in different contexts, they do not provide as optimal a foundation for both functional and aesthetic purposes as the 1.5-times rule. The option suggesting the same length as the anticipated crown may not provide adequate retention and could compromise the stability of the restoration, especially under the forces of chewing. Thus, the guideline of 1.5 times the crown contributes to a more durable and maintainable restorative outcome.