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Objectives: The degradation of the restorative-dentin interface due to endogenous dentin enzymes, such as matrix metalloproteinases (MMPs), is a significant issue that accelerates the deterioration of the dentin matrix and leads to the failure of restorative treatments. Caredyne Restore (CR), a novel glass ionomer cement (GIC) with zinc ions in its formulation, represents the latest effort to mitigate this issue. This investigation aimed to evaluate the MMPs inhibitory effect, marginal integrity, and cytotoxicity of CR compared to a conventional GIC, Fuji IX (FIX).
Methods: The inhibitory effect of CR on MMPs activity was evaluated using in-situ zymography to visualize the endogenous gelatinolytic activity in the GIC-dentin interface. Additionally, CR's sealing properties were investigated using dye-assisted confocal laser microscopy (CLSM) to assess marginal leakage across the GIC-dentin interface. Both in-situ zymography and CLSM observations were conducted 1 day and seven days after pH cycling. Finally, the cytotoxicity of the GIC eluates was examined on rat dental pulp cells (RPCC2A). Assay measurements were performed after 24 and 48 h of incubation with test solutions prepared using various GIC eluate concentrations.
Results: The MMPs activity of the CR specimens was significantly lower than that of FIX specimens after seven days of pH cycling. Signs of marginal leakage were also lower in the CR specimens. Comparison of CR and FIX eluates at the same concentration showed no significant difference in terms of biocompatibility.
Conclusions: Caredyne restore is capable of inhibiting endogenous enzyme activity and improving sealing properties, while maintaining sufficient biocompatibility.
Clinical Significance: Zinc ions released from Caredyne Restore offer a safe way to improve the quality of dental restorations and promote minimally invasive treatment, especially in lesions where the dentin matrix is susceptible to enzymatic degradation and recurrent caries.
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Source |
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http://dx.doi.org/10.1016/j.jdent.2024.105450 | DOI Listing |
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