EJPRD_2755AliRezaKetabi11.pdf

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D.O.I.

Abstract

European Journal of Prosthodontics and Restorative Dentistry (2025) 33, 379–389

Keywords
Cast Post
Fibre-Reinforced Root Posts
Postendodontic Reconstruction
Survival Rate In Situ Root Posts
Fibre-Reinforced Composite Resin
Post

Authors

Clinical Study of FibreReinforced Root Posts with
a Ten-Year Observation
Period: A Retrospective
Study

Ali-Reza Ketabi* §

(Dr. med. dent., MSc)

Maximilian J. Dobbertin ‡ ^
(Dr. med. dent.)

Hans-Christoph Lauer ^
(Prof. Dr. med. dent.)

Laurentia Schuster †
(Dr. med. dent.)

Andree Piwowarczyk *
(Prof. Dr. med. dent.)

Address for Correspondence
Ali-Reza Ketabi* §
Email: [email protected]
* Department of Prosthodontics, School of
Dentistry, Faculty of Health, Witten/Herdecke
University, Alfred-Herrhausen-Straße 45, 58455
Witten, Germany
§

Private Dental Office of Dr Ali-Reza Ketabi,
Kirchheimerstr. 71, 70619 Stuttgart, Germany

‡

Private Practice Dr. Dobbertin, Eschersheimer
Landstraße 44, 60322 Frankfurt , Germany

^ Department of Prosthodontics, Center for
Dentistry and Oral Medicine (Carolinum),
Goethe-University, Theodor-Stern-Kai 7, 60596
Frankfurt, Germany
†

Department of Periodontology and Operative
Dentistry, University of Münster, Waldeyerstraße
30, 48149 Münster, Germany

Received: 12.07.2024
Accepted: 15.07.2025
doi: 10.1922/EJPRD_2755AliRezaKetabi11

ABSTRACT
Purpose: To analyze the survival rates and influential factors of in situ root posts from
2007 to 2017, identifying key parameters affecting their longevity. Methods: The study
included all restorations treated at the Department of Prosthodontics, Center for Dentistry and Oral Medicine (Carolinum), Goethe-University, from 2007 to 2017, involving
1120 fibre-reinforced root posts with an 8.0% dropout rate and a significance level of
alpha <5%. Results: Patients had a mean age of 61.1±14.37 years. The study found a
survival rate of 60.71±14.70 years versus a loss at 64.58±10.45 years (p<0.05). The
periodontal condition was the most significant factor affecting survival. Cytec Blanco and
DT light post showed similar ten-year survival rates of 79.17% and 79.34%, respectively,
without significant differences. Periodontal health was the most critical factor for root
post loss. Conclusion: Root post loss is more influenced by patient’s periodontal health
and the indication for root canal treatment than by the structural characteristics of the
fibre posts. Clinical relevance: This retrospective cohort study addresses the lack of longterm (>10 years) clinical research on fibre-reinforced root posts, focusing on various
factors influencing their success or failure.

INTRODUCTION
Root posts are used in dentistry to provide an endodontically treated
and extensively damaged tooth with enough retention surface for later
restoration. A build-up filling is attached to a root post in the form of a
core build-up. This should have the structural advantage of allowing the
prosthetic restoration that follows the treatment to be more securely anchored to the tooth.1
In a large-scale study, Ferrari et al. show that teeth with a root post have
a significantly higher probability of survival than those without a root post
and that fractures of any kind occur less frequently.2 The selection of different materials from which root posts are made ranges from metals and
ceramics to fibre-reinforced composite root posts.3,4 Metallic root posts
no longer correspond to the lege artis treatment methods, as they show
significantly lower survival rates compared to fibre-reinforced root posts.5
A fibre-reinforced root post is a material with an elastic modulus (modulus
of elasticity) similar to dentin. If the material behaves in a tissue-compatible
manner, the entire composite of tooth, root post and superstructure should

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