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01-10-2021 | Review

The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review

Authors: Valter Fernandes, Ana S. Silva, Oscar Carvalho, Bruno Henriques, Filipe S. Silva, Mutlu Özcan, Júlio C. M. Souza

Published in: Clinical Oral Investigations | Issue 10/2021

Abstract

Objective

The aim of this study was to perform an integrative review on the layer thickness and microstructure of resin-matrix cements around custom-made or standard teeth root intracanal posts.

Materials and methods

An electronic search was conducted on the PubMed using a combination of the following scientific terms: intraradicular post, root intracanal post, resin cement, thickness, adaptation, endodontic post, layer thickness, fit, shape, and endodontic core. The literature selection criteria accepted articles published in the English language, up to May 2021, involving in vitro analyses, meta-analyses, randomized controlled trials, and prospective cohort studies.

Results

The search identified 154 studies, of which 24 were considered relevant to this study. The selected studies provided important data considering cement layer thickness, tooth preparation, endodontic post, and type of resin-matrix cement. The anatomical variability of root canal systems, such as the oval- or C-shaped, represents a challenge in dental restoration with tooth root intracanal posts. The fitting of intracanal posts to different root regions is variable resulting in thick and irregular layers of resin-matrix cement. Defects like pores, micro-cracks, and micro-gaps were detected in the resin-matrix cement microstructure and represent spots of stress concentration and fracture. Custom-made tooth root intracanal posts provide a proper fitting and decrease the layer thickness of resin-matrix cement.

Conclusions

In fact, the layer thickness of resin-matrix cements depends on the fitting of endodontic posts to tooth root canals. An increase of resin cement thickness causes the appearance of defects like pores, micro-cracks, and micro-gaps that can induce stress concentration and fractures at interfaces.

Clinical relevance

The fitting of the endodontic post into the teeth root canal determine the layer thickness of the resin-matrix cement to establish an adequate retention. However, the increase in the thickness of the resin-matrix cement layer can lead to a high number of defects like pores or cracks and therefore decrease the strength of the interface.

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Title: The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review
Authors: Valter Fernandes
Ana S. Silva
Oscar Carvalho
Bruno Henriques
Filipe S. Silva
Mutlu Özcan
Júlio C. M. Souza
Publication date: 01-10-2021
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 10/2021
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-021-04070-9

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Springer Medicine

The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review

Abstract

Objective

Materials and methods

Results

Conclusions

Clinical relevance

At a glance: The ONWARDS insulin icodec trials

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Abstract

Objective

Materials and methods

Results

Conclusions

Clinical relevance

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