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reconstruct endodontically treated teeth in a way that would offer protection to the
remaining dental structure. Cast metallic cores have been the most popular
technique for the reconstruction of such teeth. Several authors claim that these
cast metallic cores perform their function best of all because they are tougher,
more versatile and fit the root canal better (Hirschfeld & Stern, 1972; Perel &
Muroff, 1972; Kantor & Pines, 1977; Gelfand, Goldman & Sunderman, 1984;
Plasmans, Welle & Vrijhoef, 1988; Bex et al., 1992). However, this
reconstruction technique presents some disadvantages such as more clinical
sessions, the use of laboratory procedures, higher costs and more healthy tissue
removal to allow cast moulding, compared with the core and post technique.
An alternative technique uses composite resin cores with or without the use
posts. Although composite resin cores present some disadvantages such as thermal
mismatch with the remaining dental structure and an undesirable contraction
during the process of resin cure, the associated technique results in more
preservation of healthy tissue, time saved for both patients and professionals,
lower costs, higher ultimate strength and no need for laboratory procedures.
To put it differently, the study on this subject is incomplete. Much work
remains to be done.
Nowadays many post systems are available. Posts are divided into two
types: active posts and passive posts. In the case of active engagement, the post
mechanically engages to the wall of the canal through the use of the threads.
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