Why can high stress be generated during insertion with smooth, parallel-sided posts?

High stress is generated during the insertion of smooth, parallel-sided posts primarily because there is no space for cement escape. When a post is inserted into a canal, especially one that is parallel-sided and smooth, it creates a tight fit with the walls of the canal. This lack of space for the cement to escape can lead to an increase in hydrostatic pressure as the post is being pushed into place. The inability of the cement to flow and escape compresses the material, leading to the build-up of stress.

In situations where adequate space for displacement of the cement is not provided, this stress can adversely affect both the post and the surrounding tooth structure, leading to potential complications down the line, such as failure of the bond or damage to the tooth. This concept is crucial in the design and selection of posts for endodontic treatments, emphasizing the need for appropriate post dimensions and surface characteristics to ensure successful outcomes in prosthetic dentistry.