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The influence of FRCs reinforcement on marginal adaptation of CAD/CAM composite resin endocrowns after simulated fatigue loading

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Abstract

To evaluate the marginal adaptation of endodontically treated molars restored with CAD/CAM composite resin endocrowns either with or without reinforcement by fibre reinforced composites (FRCs), used in different configurations. 32 human endodontically treated molars were cut 2 mm over the CEJ. Two interproximal boxes were created with the margins located 1 mm below the CEJ (distal box) and 1 mm over the CEJ (mesial box). All specimens were divided in four groups (n = 8). The pulp chamber was filled with: group 1 (control), hybrid resin composite (G-aenial Posterior, GC); group 2, as group 1 but covered by 3 meshes of E-glass fibres (EverStick NET, Stick Tech); group 3, FRC resin (EverX Posterior, GC); group 4, as group 3 but covered by 3 meshes of E-glass fibres. The crowns of all teeth were restored with CAD/CAM composite resin endocrowns (LAVA Ultimate, 3M). All specimens were thermo-mechanically loaded in a computer-controlled chewing machine (600,000 cycles, 1.6 Hz, 49 N and simultaneously 1500 thermo-cycles, 60 s, 5–55 °C). Marginal analysis before and after the loading was carried out on epoxy replicas by SEM at 200× magnification. For all the groups, the percentage values of perfect marginal adaptation after loading were always significantly lower than before loading (p < 0.05). The marginal adaptation before and after loading was not significantly different between the experimental groups (p > 0.05). Within the limitations of this in vitro study, the use of FRCs to reinforce the pulp chamber of devitalized molars restored with CAD/CAM composite resin restorations did not significantly influenced their marginal quality.

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Acknowledgments

The Authors wish to thank GC and 3M Espe for their generous supply of the tested materials.

Conflict of interest

G. T. Rocca, C. M. Saratti, A. Poncet, A. J. Feilzer, I. Krejci declare that they have no conflict of interest.

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Authors and Affiliations

  1. Division of Cariology and Endodontology, School of Dentistry, University of Geneva, 19 Rue, Barthélémy Menn, 1205, Geneva, Switzerland

    Giovanni Tommaso Rocca, Carlo Massimo Saratti & Ivo Krejci

  2. CRC and Division of Clinical-Epidemiology, Department of Health and Community Medicine, University of Geneva and University Hospitals of Geneva, Geneva, Switzerland

    Antoine Poncet

  3. Department of Dental Materials Science, ACTA, Amsterdam, The Netherlands

    Albert J. Feilzer

Authors
  1. Giovanni Tommaso Rocca
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  2. Carlo Massimo Saratti
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  3. Antoine Poncet
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  4. Albert J. Feilzer
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  5. Ivo Krejci
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Correspondence to Giovanni Tommaso Rocca.

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Rocca, G.T., Saratti, C.M., Poncet, A. et al. The influence of FRCs reinforcement on marginal adaptation of CAD/CAM composite resin endocrowns after simulated fatigue loading. Odontology 104, 220–232 (2016). https://doi.org/10.1007/s10266-015-0202-9

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  • DOI: https://doi.org/10.1007/s10266-015-0202-9

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