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Repairability of CAD/CAM high-density PMMA- and composite-based polymers

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Abstract

Objective

The study aimed to analyse the shear bond strength of computer-aided design and computer-aided manufacturing (CAD/CAM) polymethyl methacrylate (PMMA)- and composite-based polymer materials repaired with a conventional methacrylate-based composite after different surface pretreatments.

Methods

Each 48 specimens was prepared from six different CAD/CAM polymer materials (Ambarino high-class, artBloc Temp, CAD-Temp, Lava Ultimate, Telio CAD, Everest C-Temp) and a conventional dimethacrylate-based composite (Filtek Supreme XTE, control) and aged by thermal cycling (5000 cycles, 5–55 °C). The surfaces were left untreated or were pretreated by mechanical roughening, aluminium oxide air abrasion or silica coating/silanization (each subgroup n = 12). The surfaces were further conditioned with an etch&rinse adhesive (OptiBond FL) before the repair composite (Filtek Supreme XTE) was adhered to the surface. After further thermal cycling, shear bond strength was tested, and failure modes were assessed. Shear bond strength was statistically analysed by two- and one-way ANOVAs and Weibull statistics, failure mode by chi2 test (p ≤ 0.05).

Results

Shear bond strength was highest for silica coating/silanization > aluminium oxide air abrasion = mechanical roughening > no surface pretreatment. Independently of the repair pretreatment, highest bond strength values were observed in the control group and for the composite-based Everest C-Temp and Ambarino high-class, while PMMA-based materials (artBloc Temp, CAD-Temp and Telio CAD) presented significantly lowest values. For all materials, repair without any surface pretreatment resulted in adhesive failures only, which mostly were reduced when surface pretreatment was performed.

Conclusions

Repair of CAD/CAM high-density polymers requires surface pretreatment prior to adhesive and composite application. However, four out of six of the tested CAD/CAM materials did not achieve the repair bond strength of a conventional dimethacrylate-based composite.

Clinical relevance

Repair of PMMA- and composite-based polymers can be achieved by surface pretreatment followed by application of an adhesive and a conventional methacrylate-based composite.

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Conflict of interest

The authors declare that they have no financial or other relationships that might lead to actual or potential conflict of interest. The major parts of this study were self-funded by the authors and their institutions. The polymer and composite materials used were provided by the manufacturers.

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Authors and Affiliations

  1. Department of Preventive Dentistry, Periodontology and Cariology, University of Göttingen, Robert-Koch-Str. 40, D-37075, Göttingen, Germany

    Annette Wiegand & Robin Hoffmann

  2. Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zurich, Zurich, Switzerland

    Lukas Stucki & Thomas Attin

  3. Department of Prosthodontics, Ludwig-Maximilians University, Munich, Germany

    Bogna Stawarczyk

Authors
  1. Annette Wiegand
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  2. Lukas Stucki
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  3. Robin Hoffmann
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  4. Thomas Attin
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  5. Bogna Stawarczyk
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Correspondence to Annette Wiegand.

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Wiegand, A., Stucki, L., Hoffmann, R. et al. Repairability of CAD/CAM high-density PMMA- and composite-based polymers. Clin Oral Invest 19, 2007–2013 (2015). https://doi.org/10.1007/s00784-015-1411-x

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  • DOI: https://doi.org/10.1007/s00784-015-1411-x

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