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Open Access
CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0045-1811715
Original Article

Endocrowns for Rehabilitation of Anterior Teeth: In Vitro Mechanical Analysis

Authors

  • Alison Flávio Campos dos Santos

    1   Postgraduate Program in Health Sciences, University of Taubaté, Taubaté, Brazil

  • Kusai Baroudi 

    2   Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, United Arab Emirates
    3   Centre of Medical and Bio-allied Health Sciences Research, Ajman, United Arab Emirates

  • Rama Yassin Almaghribi

    2   Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, United Arab Emirates

  • Laís Regiane Silva Concílio

    4   Department of Dentistry, University of Taubaté, Taubaté, Brazil

  • Regina Clara Gambaro de Abreu

    1   Postgraduate Program in Health Sciences, University of Taubaté, Taubaté, Brazil

  • Marina Amaral

    4   Department of Dentistry, University of Taubaté, Taubaté, Brazil

Funding This study was supported by the São Paulo Research Foundation (FAPESP 2019/20801-4) with research grant and by Coordination of Superior Level Staff Improvement (CAPES) with PhD scholarship received by Dr. Alison Flávio Campos dos Santos.
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Abstract

Objective

This article evaluates the fracture load after mechanical cycling of severely damaged endodontically treated teeth restored with: (1) fiber post, composite resin core, and lithium disilicate (LD) crown; (2) individually fabricated LD post-core and LD crown; (3) LD endocrown; or (4) resin matrix ceramic endocrown.

Materials and Methods

Sixty bovine roots were endodontically treated and prepared for intraradicular retention at depths of 10 or 5 mm. Fiber posts or individually fabricated LD post-cores were cemented into 10-mm-deep prepared root canals. LD crowns were manufactured and cemented onto the cores. Endocrowns (LD or resin matrix ceramic) were fabricated and cemented into 5-mm-deep prepared roots. All samples (n = 15) were subjected to mechanical cycling (1 × 106 cycles at 100 N and 4 Hz), followed by fracture load testing and failure mode analysis.

Statistical Analysis

Data were subjected to Kruskal–Wallis followed by Dwass-Steel-Critchlow-Fligner test (α = 0.05).

Results

The LD post-core group exhibited seven failures regarding endodontic retention during mechanical cycling and showed the lowest fracture load (192.9 N; p = 0.021). The highest fracture load was observed in the resin matrix ceramic endocrown group (713.9 N), with three catastrophic failures (root fracture). The fiber post-resin core-crown group presented the lowest number of failures during fatigue test (13%) and the lowest number of catastrophic failures (13% root fracture).

Discussion

The improved bonding potential of resin matrix ceramic endocrowns may contribute to higher fracture resistance and enhanced survival under mechanical fatigue compared to LD post-core systems.

Conclusion

Resin matrix ceramic endocrowns are an option for restoring anterior severely damaged endodontically treated teeth, with the highest load to failure. However, the conventional post-core-crown strategy demonstrated lower number of failures during fatigue and lowest number of catastrophic failures (root fracture).

Keywords

crowns - ceramics - lithium disilicate - fatigue

Clinical Relevance

For anterior teeth with narrow root canals or limited occlusal space, resin matrix ceramic endocrowns may be considered a viable restorative alternative to the conventional fiber post–resin core–lithium disilicate crown approach.




Publikationsverlauf

Artikel online veröffentlicht:
22. September 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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