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Fracture resistance of fiber-reinforced vs. non-fiber-reinforced composite molar crowns

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Abstract

This study compared fracture resistance of fiber-reinforced and non-fiber-reinforced composite molar crowns under simulated oral stress conditions. Three groups of fiber-reinforced composite crowns were constructed using one polyethylene fiber (belleGlass/Connect) and two glass fiber reinforcement systems (Sculpture/FiberKor, Targis/Vectris). The non-fiber-reinforced crowns based on the facing material alone: Sculpture, Targis or belleGlass. Additionally, crowns were made of the non-reinforced composite Artglass. Each group consisted of eight crowns. All crowns were luted to human molars and exposed to thermal cycling and mechanical loading (6000×5°C/55°C; 1.2×106×50 N; 1.66 Hz). The fracture resistance was measured using a Zwick universal testing machine. Results: The non-reinforced Artglass crowns demonstrated the highest fracture resistance, significantly higher than the resistance shown with belleGlass, belleGlass/Connect or Targis. Artglass showed an extremely wide distribution of values, however. No statistically significant differences were found between the reinforced and non-reinforced composite crowns of Vectris/Targis, FiberKor/Sculpture or Connect/belleGlass although the reinforced crowns showed a tendency towards higher values. The fracture resistance values scattered markedly more for the reinforced crowns, and their lowest fracture values also reached the level of the lowest non-reinforced crowns. The small distribution of fracture values for the non-reinforced crowns indicates that they will be less susceptible for manufacturing faults and more reliable under clinical conditions. Conclusions: Results of this study suggest that single molar composite crowns (tested in this study) do not benefit from fiber-reinforcement.

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Authors and Affiliations

  1. Department of Prosthodontics, University of Regensburg, 93042, Regensburg, Germany

    M. Behr, M. Rosentritt, D. Latzel & G. Handel

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  1. M. Behr
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  2. M. Rosentritt
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  3. D. Latzel
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  4. G. Handel
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Correspondence to M. Behr.

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Behr, M., Rosentritt, M., Latzel, D. et al. Fracture resistance of fiber-reinforced vs. non-fiber-reinforced composite molar crowns. Clin Oral Invest 7, 135–139 (2003). https://doi.org/10.1007/s00784-003-0211-x

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  • DOI: https://doi.org/10.1007/s00784-003-0211-x

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