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Prosthodontic treatment of an endodontically treated tooth poses a challenge to the practitioner. Endodontic therapy has provided a solution to retain mutilated teeth. Coronoradicular reconstruction in the form of cast post and core is used as a method to provide retention and resistance form to the restoration. Endodontically treated teeth are dessicated, inelastic and brittle& have lower resistance to caries. Their inability to form secondary dentin makes them weak and susceptible to fracture. To prevent fracture and support crown and bridge, reinforcement in the form of intraradicular devices is being used. A cast post is one such method. Vertical and horizontal root fractures can occur as a result of excessive removal of tooth structure during root canal treatment, dowel placement or inceasing the width of the dowel. A cast post and core should fit passively in the canal. Even a minimally oversized post can lead to transfer of stresses to the canal walls and increase the risk of root fracture. Therefore it is necessary to ensure that there is passive fit of the post and core. Shrinkage of the mould cavity is desired during the casting process to allow a passive fit. The effect of lined and unlined rings in the dimensional behaviour of the investment during setting and subsequent heating has been investigated and it is shown that casting made of unlined rings are undersized.

Effect of ring liner and casting ring temperature on the dimensional changes in morphologic cast posts:An in vitro study