Which type of post is NOT commonly recognized?

The answer indicates that the type of post that is not commonly recognized in prosthetic dentistry is the horizontal post. In dental practice, posts are typically used in endodontically treated teeth to provide support and retention for a crown.

Direct and indirect posts are both widely utilized techniques. Direct posts are fabricated on-site and can be directly adapted to the tooth structure, whereas indirect posts are made outside the mouth, providing more customization for the intended framework. In contrast, horizontal posts are not established as a common classification within dental prosthetics. The standard classifications focus primarily on the orientation and method in which posts are placed, with a clear preference for vertical orientations for effective force distribution.

Parallel posts, while less common than direct or indirect, refer to a concept related to the alignment and angulation of the posts rather than a specific type of post distinct from the others mentioned. Overall, the confusion might arise from the terminology, but horizontal posts do not align with accepted practices or classifications in current prosthetic dentistry.