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Mineral density changes in bovine carious dentin after treatment with bioactive dental cements: a comparative micro-CT study

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Abstract

Objectives

To evaluate the potential of conventional glass ionomer cement (GIC), Biodentine™, MTA, and Portland cement to induce mineral density changes in carious dentin compared to zinc oxide eugenol control cement (ZOE).

Materials and methods

Fifty blocks of bovine root dentin were prepared and a biofilm model using ATCC strains of S.mutans, S.sobrinus, and L.casei was used to promote artificial dentin lesions. After demineralization, the blocks were randomly divided into the five cement groups. Half of the surface of each specimen received the tested material and the other half was covered with wax (control). Samples were stored in phosphate buffered saline solution for 30 days and after that were scanned in a micro-CT with standardized parameters. Dentin mineral density changes were calculated using differences in plot profiles of the exposed and control carious dentin. Friedman’s test, followed by Wilcoxon signed-rank test was used with 5% significance.

Results

Mean ΔZ values for the cements were 48.63 ± 19.09 for the control (ZOE), 63.31 ± 32.59 for Biodentine™, 114.63 ± 72.92 for GIC, 109.56 ± 66.28 for MTA, and 106.88 ± 66.02 for Portland cement. All cements showed a statistically significant increase in ΔZ values compared to the control, but Biodentine™ values were statistically significantly lower compared to GIC and the other calcium silicate cements.

Conclusions

Tested materials present potential to induce mineral density changes in carious bovine dentin. MTA, Portland, and GIC showed higher bioactivity potential than Biodentine™.

Clinical relevance

Based on minimally invasive concept, materials with remineralization potential can be used to preserve diseased but still repairable dental tissue.

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Acknowledgments

The authors are grateful to the Department of Pediatric Dentistry and Orthodontics in Federal University of Rio de Janeiro (UFRJ) and Laboratory for Nuclear Instrumentation (UFRJ).

Funding

The work was supported by the Department of Pediatric Dentistry and Orthodontics and Laboratory for Nuclear Instrumentation of Federal University of Rio de Janeiro. This study was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Pesquisa Científica (CNPq), and Fundação Carlos Chagas de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ).

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Correspondence to Aline de Almeida Neves.

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Neves, A.B., Bergstrom, T.G., Fonseca-Gonçalves, A. et al. Mineral density changes in bovine carious dentin after treatment with bioactive dental cements: a comparative micro-CT study. Clin Oral Invest 23, 1865–1870 (2019). https://doi.org/10.1007/s00784-018-2644-2

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