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Case Report
Reattachment of a fractured fragment with relined fiber post using indirect technique: a case report
Eun-Soo Kim, Kyung-San Min, Mi-Kyung Yu, Kwang-Won Lee
Restor Dent Endod 2014;39(4):324-328.   Published online September 5, 2014
DOI: https://doi.org/10.5395/rde.2014.39.4.324
AbstractAbstract PDFPubReaderePub

Although fiber-reinforced posts have been widely used, they sometimes fail to obtain sufficient retention because of an extremely large canal space. To address this, several techniques have been introduced including relining of the fiber-reinforced posts. Here, we used a relined glass-fiber post to increase retention and fitness to the root canal in a crown reattachment case. The relining procedure was performed by using an indirect method on the working cast. This case also highlights the esthetic concerns regarding dehydration of the attached crown fragment.

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Review Article
Chemical characteristics of mineral trioxide aggregate and its hydration reaction
Seok-Woo Chang
Restor Dent Endod 2012;37(4):188-193.   Published online November 21, 2012
DOI: https://doi.org/10.5395/rde.2012.37.4.188
AbstractAbstract PDFPubReaderePub

Mineral trioxide aggregate (MTA) was developed in early 1990s and has been successfully used for root perforation repair, root end filling, and one-visit apexification. MTA is composed mainly of tricalcium silicate and dicalcium silicate. When MTA is hydrated, calcium silicate hydrate (CSH) and calcium hydroxide is formed. Formed calcium hydroxide interacts with the phosphate ion in body fluid and form amorphous calcium phosphate (ACP) which finally transforms into calcium deficient hydroxyapatite (CDHA). These mineral precipitate were reported to form the MTA-dentin interfacial layer which enhances the sealing ability of MTA. Clinically, the use of zinc oxide euginol (ZOE) based materials may retard the setting of MTA. Also, the use of acids or contact with excessive blood should be avoided before complete set of MTA, because these conditions could adversely affect the hydration reaction of MTA. Further studies on the chemical nature of MTA hydration reaction are needed.

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