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Clinical Oral Investigations
Published in: Clinical Oral Investigations 1/2020

Open Access 01-01-2020 | Original Article

Fracture resistance and marginal gap formation of post-core restorations: influence of different fiber-reinforced composites

Authors: Márk Fráter, Lippo Lassila, Gábor Braunitzer, Pekka K. Vallittu, Sufyan Garoushi

Published in: Clinical Oral Investigations | Issue 1/2020

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Abstract

Objectives

The aim was to explore the fracture behavior and marginal gap within the root canal of endodontically treated (ET) premolars restored with different fiber-reinforced post-core composites (FRCs). Further aim was to evaluate the composite curing at different depths in the canal.

Materials and methods

Eighty-seven intact upper premolars were collected and randomly divided into six groups. After endodontic procedure, standard MOD cavities were prepared and restored with their respective fiber-reinforced post-core materials: group 1: prefabricated unidirectional FRC-post + conventional composite core; group 2: prefabricated unidirectional FRC-post + short fiber composite (SFRC) core; group 3: individually formed unidirectional FRC-post + conventional composite core; group 4: randomly oriented SFRC directly layered as post and core; group 5: individually formed unidirectional FRC + randomly oriented SFRC as post and core. After restorations were completed, teeth (n = 3/group) were sectioned and then stained. Specimens were viewed under a stereo microscope and the percentage of microgaps within the root canal was calculated. Fracture load was measured using universal testing machine.

Results

SFRC application in the root canal (groups 4 and 5) showed significantly higher fracture load (876.7 N) compared to the other tested groups (512–613 N) (p < 0.05). Post/core restorations made from prefabricated FRC-post (group 1) exhibited the highest number of microgaps (35.1%) at the examined interphase in the root canal.

Conclusions

The restoration of ET premolars with the use of SFRC as post-core material displayed promising performance in matter of microgap and load-bearing capacity.

Clinical significance

Fracture resistance of ET premolar restored by bilayered composite restoration that includes both SFRC as post-core material and surface conventional resin seems to be beneficial.
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Metadata
Title
Fracture resistance and marginal gap formation of post-core restorations: influence of different fiber-reinforced composites
Authors
Márk Fráter
Lippo Lassila
Gábor Braunitzer
Pekka K. Vallittu
Sufyan Garoushi
Publication date
01-01-2020
Publisher
Springer Berlin Heidelberg
Published in
Clinical Oral Investigations / Issue 1/2020
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI
https://doi.org/10.1007/s00784-019-02902-3

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