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Comparative evaluation of
Emblica officinalis as an etchant and an MMP inhibitor with orthophosphoric acid and chlorhexidine on the microshear bond strength of composite resin: anex vivo study - Divya Sangeetha Rajkumar, Annapoorna Ballagere Mariswamy
- Restor Dent Endod 2021;46(3):e36. Published online June 8, 2021
- DOI: https://doi.org/10.5395/rde.2021.46.e36
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Abstract
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ePub Objectives This study aimed to evaluate
Emblica officinalis (Indian gooseberry or amla) as an acid etchant and matrix metalloproteinase (MMP) inhibitor, and to compare its effect on the microshear bond strength of composite resin with orthophosphoric acid (OPA) and 2% chlorhexidine (CHX) as an acid etchant and MMP inhibitor, respectively.Materials and Methods The etching effect and MMP-inhibiting action of amla on dentin samples were confirmed by scanning electron microscopy (SEM) and gelatin zymography, respectively. Dentinal slabs (3 mm thick) from 80 extracted human molars were divided into 10 and 20 samples to form 2 control groups and 3 experimental groups. Groups 1, 2, and 4 were etched with OPA and groups 3 and 5 with amla juice. An MMP inhibitor was then applied: CHX for group 2 and amla extract for groups 4 and 5. Groups 1 and 3 received no MMP inhibitor. All specimens received a standardized bonding protocol and composite resin build-up, and were subjected to microshear bond strength testing. The force at which the fracture occurred was recorded and statistically analyzed.
Results Amla juice had a similar etching effect as a self-etch adhesive in SEM and 100% amla extract was found to inhibit MMP-9 by gelatin zymography. The microshear bond strength values of amla were lower than those obtained for OPA and CHX, but the difference was not statistically significant.
Conclusions Amla has a promising role as an acid etchant and MMP inhibitor, but further studies are necessary to substantiate its efficacy.
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Citations
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Review Article
- Inhibition of matrix metalloproteinases: a troubleshooting for dentin adhesion
- Izadora Quintela Souza de Moraes, Ticiano Gomes do Nascimento, Antonio Thomás da Silva, Lilian Maria Santos Silva de Lira, Abhishek Parolia, Isabel Cristina Celerino de Moraes Porto
- Restor Dent Endod 2020;45(3):e31. Published online May 22, 2020
- DOI: https://doi.org/10.5395/rde.2020.45.e31
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Abstract
PDFPubReaderePub
Matrix metalloproteinases (MMPs) are enzymes that can degrade collagen in hybrid layer and reduce the longevity of adhesive restorations. As scientific understanding of the MMPs has advanced, useful strategies focusing on preventing these enzymes' actions by MMP inhibitors have quickly developed in many medical fields. However, in restorative dentistry, it is still not well established. This paper is an overview of the strategies to inhibit MMPs that can achieve a long-lasting material-tooth adhesion. Literature search was performed comprehensively using the electronic databases: PubMed, ScienceDirect and Scopus including articles from May 2007 to December 2019 and the main search terms were “matrix metalloproteinases”, “collagen”, and “dentin” and “hybrid layer”. MMPs typical structure consists of several distinct domains. MMP inhibitors can be divided into 2 main groups: synthetic (synthetic-peptides, non-peptide molecules and compounds, tetracyclines, metallic ions, and others) and natural bioactive inhibitors mainly flavonoids. Selective inhibitors of MMPs promise to be the future for specific targeting of preventing dentin proteolysis. The knowledge about MMPs functionality should be considered to synthesize drugs capable to efficiently and selectively block MMPs chemical routes targeting their inactivation in order to overcome the current limitations of the therapeutic use of MMPs inhibitors,
i.e ., easy clinical application and long-lasting effect.-
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- 904 View
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Basic Research
- The effect of tumor necrosis factor (TNF)-α to induce matrix metalloproteinase (MMPs) from the human dental pulp, gingival, and periodontal ligament cells
- Eun-Mi Rhim, Sang-Hyuk Park, Duck-Su Kim, Sun-Young Kim, Kyoung-Kyu Choi, Gi-Woon Choi
- J Korean Acad Conserv Dent 2011;36(1):26-36. Published online January 31, 2011
- DOI: https://doi.org/10.5395/JKACD.2011.36.1.26
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Abstract
PDFPubReaderePub
Objectives In the present study, three kinds of tissues cells (pulp, gingiva, and periodontal ligament) were investigated if those cells express MMP and TIMP when they were stimulated with neuropeptides (substance P, CGRP) or proinflammatory cytokine, TNF-α.
Materials and Methods The cells cultured from human dental pulp (PF), gingiva (GF) and periodontal ligament were (PDLF) stimulated with Mock, SP, TNF-α, and CGRP for 24 hrs and 48 hrs. for an RNase protection assay and Enzyme Linked Immunosorbent Assay.
Cells (PF, GF and PDLF) seeded in 100 mm culture dish were stimulated with SP (10-5, 10-8 M) or only with medium (Mock stimulation) for 4hrs and for 24 hrs for RNase Protection Assay, and they were stimulated with CGRP (10-5 M) and TNF-α (2 ng/mL) for 24 hrs and with various concentraion of TNF-α (2, 10, and 100 ng/mL) for Rnase Protection Assay with a human MMP-1 probe set including MMP 1, 2, 8, 7, 8, 9, 12, and TIMP 2, 3.
In addition, cells (PF, GF and PDLF) were stimulated with Mock and various concentraion of TNF-α (2, 10, and 100 ng/mL) for 24 hrs and with TNF-α (10 ng/mL) for 48 hrs, and the supernatents from the cells were collected for Enzyme Linked Immunosorbent Assay (ELISA) for MMP-1 and MMP-13.
Results The expression of MMPs in PF, GF, PDLF after stimulation with SP and CGRP were not changed compared with Mock stimulation for 4 hrs and 24 hrs. The expression of MMP-1, -12, -13 24 hrs after stimulation with TNF-α were upregulated, however the expression of TIMP-3 in PF, GF, PDLF after stimulation with TNF-α were downregulated. TNF-α (2 ng/mL, 10 ng/mL, 100 ng/mL) increased MMP-1 and MMP-12 expression in PF dose dependently for 24 hrs.
Conclusions TNF-α in the area of inflammation may play an important role in regulating the remodeling of dentin, cementum, and alveolar bone.
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Citations
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