What should the maximum size of a post be compared to the root diameter?

The maximum size of a post should be 1/3 the diameter of the root. This guideline helps ensure that the post provides adequate support without compromising the stability and health of the tooth. A post that is too large can lead to greater stress on the remaining tooth structure, increasing the risk of fracture or failure. Additionally, using this size helps to maintain a balance between retention and the preservation of tooth structure, ensuring that the post does not interfere with the natural anatomy and function of the tooth. By adhering to this proportion, clinicians can achieve optimal outcomes in restorative dental procedures.