Fatigue behavior of endodontically treated premolars restored with different fiber-reinforced designs

Márk Fráter; Tekla Sáry; Blanka Jókai; Gábor Braunitzer; Eija Säilynoja; Pekka K Vallittu; Lippo Lassila; Sufyan Garoushi

doi:10.1016/j.dental.2020.11.026

Fatigue behavior of endodontically treated premolars restored with different fiber-reinforced designs

Dent Mater. 2021 Mar;37(3):391-402. doi: 10.1016/j.dental.2020.11.026. Epub 2021 Jan 19.

Authors

Márk Fráter¹, Tekla Sáry¹, Blanka Jókai¹, Gábor Braunitzer², Eija Säilynoja³, Pekka K Vallittu⁴, Lippo Lassila⁵, Sufyan Garoushi⁶

Affiliations

¹ Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, Szeged, Hungary.
² dicomLAB Dental Ltd., Szeged, Hungary.
³ Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland; Research Development and Production Department, Stick Tech Ltd - Member of GC Group, Turku, Finland.
⁴ Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland; City of Turku, Welfare Division, Turku, Finland.
⁵ Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
⁶ Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland. Electronic address: sufgar@utu.fi.

PMID: 33353735
DOI: 10.1016/j.dental.2020.11.026

Abstract

Objectives: The aim was to investigate the fatigue survival and marginal-gap inside the root-canal of endodontically treated (ET) premolars reinforced by various fiber-reinforced post-core composites (FRCs). Moreover, composite-curing at different depths in the canal was evaluated.

Methods: 170 intact upper-premolars were collected and randomly divided into ten groups (n = 15). One group served as control (intact-teeth). After endodontic procedure standard MO cavities were prepared and restored with different post-core fiber-reinforced materials and designs. Three-group (A1-A3) were restored with either packable and flowable short fiber-reinforced composite (SFRC) core or conventional composite-core. Two-group (B1-B2) were restored with SFRCs as short post (3 mm) and core. Four-group (C1-C4) were restored with SFRCs as post (6 mm) and core with or without unidirectional FRC posts (individually-made or conventional). After completing the restorations, teeth from Group C1-C4 (n = 5/group) were sectioned and stained. Specimens were viewed under a stereo-microscope and the percentage of microgaps within the root-canal was calculated. Fatigue-survival was measured using a cyclic-loading machine in the rest of the specimens.

Results: Application of flowable SFRC as luting-core material with individually-made FRC post (Group C3) did not differ from intact-teeth regarding fatigue-survival (p > 0.05). The rest of the groups produced significantly lower survival (p < 0.05) compared to intact-teeth. Post/core restorations made from packable SFRC (Group C1) had a lower microgap (19.1%) at the examined interphase in the root-canal than other groups.

Significance: The restoration of ET premolars with the use of individually-made FRC post and SFRC as luting-core material showed promising achievement regarding fatigue-resistance and survival.

Keywords: Bioblock technique; Endodontically treated teeth; Fatigue survival; Premolar teeth; Short fiber-reinforced composite.

MeSH terms

Bicuspid
Composite Resins
Dental Stress Analysis
Humans
Materials Testing
Post and Core Technique*
Root Canal Therapy
Tooth Fractures*
Tooth, Nonvital*

Substances

Composite Resins