Abstract
Introduction
Repair materials for extensive cervical root defects may come in direct contact with periodontal tissues. This in vitro study compared the effects of four calcium silicate cements (CSC), one resin-modified glass ionomer cement, and one glass carbomer cement on primary human gingival fibroblasts (HGF), alveolar osteoblasts (HAO), and a human osteoblast cell line (hFOB 1.19).
Methods
HGF, HAO, and hFOB were seeded on discoid test specimens. Relative numbers of viable cells were quantitatively assessed after 1 and 24 h for cytotoxicity/adhesion assays and after 4, 24, 48, and 72 h for proliferation assays. Data were statistically analyzed using non-parametric tests (α = 0.05).
Results
Relative to the control (100 %), CSC allowed for mean numbers of 71–81 % viable HGF and 80–82 % viable HAO. Then, 64 % of HGF and 56 % of HAO were assessed on GC Fuji II LC. Mean numbers of viable cells were 59–64 % HGF and 67–68 % HAO for GCP Glass Fill specimens. Cells exposed to CSC over 24 h remained viable and even increased in number. Both cell types adhered almost equally well to CSC and GC Fuji II LC. GCP Glass Fill continued to decrease cell viability and adhesion. CSC-based materials and GC Fuji II LC allowed for HGF and hFOB proliferation; however, none of the tested materials specifically stimulated cell proliferation.
Conclusions
CSC characterized by low cytotoxicity. GC Fuji II LC shows moderate cytotoxic effects. ProRoot MTA, Harvard MTA, Biodentine, EndoSequence putty, and GC Fuji II LC allow HGF and HAO to adhere and HGF and hFOB to proliferate. GCP Glass Fill decreases cell viability, adhesion, and proliferation.
Clinical relevance
CSC remain the paramount biologic choice for the repair of extensive cervical root defects. GC Fuji II LC might be considered in addition to CSC when the defect comprises supracrestal areas and the restoration requires superior aesthetic and mechanical characteristics.
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Acknowledgments
The authors thank Mrs Tanja Krüger and Mrs Edith Daum for their invaluable expertise and support concerning the laboratory experiments. The linguistic support of Mrs Joanna Voerste and Mr Adam Gaier in preparing the manuscript is highly appreciated. The authors further thank Mrs Kirsten Stoik for assistance in preparation of the figures. The authors also thank the manufacturers for supplying the materials.
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The authors declare that they have no conflict of interest. All materials tested within this study project were provided by the manufacturers, but they did not fund this study. They had no influence on the study design, data collection and analysis, or on the decision to publish or in preparing the manuscript.
Funding
The study project was funded by the Department of Conservative Dentistry and the Department of Orthodontics of the Clinic for Oral, Dental, and Maxillofacial Diseases, University Hospital Heidelberg, Germany.
Ethical approval
All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of the University of Heidelberg (Ref. 80/94 and S147/2010) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
Informed consent
Informed consent was obtained from all individual participants included in the study before the collection of alveolar bone cells (HAO) and/or primary human fibroblasts from the gingiva (HGF).
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Michel, A., Erber, R., Frese, C. et al. In vitro evaluation of different dental materials used for the treatment of extensive cervical root defects using human periodontal cells. Clin Oral Invest 21, 753–761 (2017). https://doi.org/10.1007/s00784-016-1830-3
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DOI: https://doi.org/10.1007/s00784-016-1830-3