How and why a cast post is made?
Usually cast posts are indicated for some anterior teeth after a root canal treatment, especially if when these teeth are prepped for crowns the preparations leave minimal tooth structure. Since cast posts are made of metal they can be thinned as much as is needed, without weakening the core portion. Another reason. that they are used is they can be fit to rather large oval root canal preparations that do not easily adapt to prefabricated round posts. Cast posts are more expensive because they involve a laboratory fee and take two visits , while prefabricated post and cores can be completed in one visit and an impression for a crown can also be completed at this visit as well ( assuming that a long enough appointment is scheduled. In my practice, I usually opt for a prefabricated post and core , assuming that it can be used without compromising the final result. That being said, there are times when only a cast post will work and I am forced to opt for this more labor intensiv