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Preparation of space for posting: effect on thickness of canal walls and incidence of perforation in molars

Preparation of space for posting can be prepared manually or mechanically with rotary instruments, such as Peeso drills, Gates-Glidden burs, or other types of rotary instruments. Regard­ less of the type of instrument used, ac­ cidents and errors, such as perfora­ tions and stripping of root structures can occur. Specific information on the effect of rotary drill size on the thick­ ness of canal walls is not provided in the literature. Unfortunately, post cav­ ity preparation is sometimes consid­ ered as nothing more than a hole drilled into the canal to receive a post, with little attention given to the anatomy of the root.

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