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Fatigue failure load of immature anterior teeth: influence of different fiber post-core systems

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Abstract

The aim was to explore the fracture-behavior, survival and marginal-microgaps within the root-canal of immature anterior teeth restored with different fiber-reinforced post-core composites (FRCs). 180 bovine-incisors were randomly divided into 6 groups (n = 30). One group served as control (group 6). The rest of the teeth were prepared to an internal diameter of 1.6 mm and the apex was sectioned. After application of an MTA-plug, teeth were restored with FRC materials: Group 1: Bioblock technique with short fiber-reinforced composite (SFRC); Group 2: Bioblock technique with flowable SFRC; Group 3: Individually-made FRC post; Group 4: Conventional FRC post; Group 5: dual-cure core build-up composite. After restorations were completed, teeth (n = 5/group) were sectioned and then 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 testing machine in the rest of the specimens. Flowable SFRC application in the root-canal (Group 2) 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 conventional FRC post (Group 4) exhibited a high number of microgaps (38.3%) at the examined interphase in the root-canal. The restoration of immature incisors with the use of flowable SFRC as post-core material displayed promising performance in a matter of fatigue-resistance and survival.

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Funding

This study belongs to and was supported by the research activity of BioCity Turku Biomaterials Research Program in Turku, Finland and by the UNKP-19-2 New National Excellence Program of The Ministry of Human Capacities, Hungary.

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Authors and Affiliations

  1. Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, Szeged, Hungary

    Márk Fráter, Tekla Sáry & Viktória Néma

  2. dicomLAB Dental Ltd, Szeged, Hungary

    Gábor Braunitzer

  3. Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC Institute of Dentistry, University of Turku, Itäinen Pitkäkatu 4 B, 20520, Turku, Finland

    Pekka Vallittu, Lippo Lassila & Sufyan Garoushi

  4. City of Turku, Welfare Division, Turku, Finland

    Pekka Vallittu

Authors
  1. Márk Fráter
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  2. Tekla Sáry
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  3. Viktória Néma
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  4. Gábor Braunitzer
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  5. Pekka Vallittu
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  6. Lippo Lassila
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  7. Sufyan Garoushi
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Correspondence to Márk Fráter.

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Author Márk Fráter declares that he has no conflict of interest. Author Tekla Sáry declares that he has no conflict of interest. Author Viktória Néma Author declares that he has no conflict of interest. Author Gábor Braunitzer declares that he has no conflict of interest. Author Pekka Vallittu declares that he consults Stick Tech–Member of GC in training and RD. Lippo Lassila declares that he has no conflict of interest. Author Sufyan Garoushi declares that he has no conflict of interest.

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Fráter, M., Sáry, T., Néma, V. et al. Fatigue failure load of immature anterior teeth: influence of different fiber post-core systems. Odontology 109, 222–230 (2021). https://doi.org/10.1007/s10266-020-00522-y

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  • DOI: https://doi.org/10.1007/s10266-020-00522-y

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