Abstract
Objectives
This study aimed to develop an antibacterial and calcium (Ca) and phosphate (P) rechargeable adhesive and investigate the effects of dimethylaminododecyl methacrylate (DMAHDM) and nanoparticles of amorphous calcium phosphate (NACP) on dentin bonding, biofilm response, and repeated Ca and P ion recharge and re-release capability for the first time.
Materials and methods
Pyromellitic glycerol dimethacrylate (PMGDM), ethoxylated bisphenol A dimethacrylate (EBPADMA), 2-hydroxyethyl methacrylate (HEMA), and bisphenol A glycidyl dimethacrylate (BisGMA) formed the adhesive (PEHB). Three groups were tested: (1) Scotchbond (SBMP, 3 M) control, (2) PEHB + 30% NACP, and (3) PEHB + 30% NACP + 5% DMAHDM. Specimens were tested for dentin shear bond strength, and Ca and P ion release, recharge, and re-release. Biofilm lactic acid production and colony-forming units (CFU) on resins were analyzed.
Results
The four groups had similar dentin shear bond strengths (p > 0.1). Adhesive with DMAHDM showed significant decrease in metabolic activity, lactic acid production, and biofilm CFU (p < 0.05). The adhesives containing NACP released high levels of Ca and P ions initially and after being recharged.
Conclusion
This study developed the first Ca and P ion-rechargeable and antibacterial adhesive, achieving strong antibacterial activity and Ca and P ion recharge and re-release for long-term remineralization.
Clinical relevance
Considering the restoration-tooth bonded interface being the weak link and recurrent caries at the margins being the primary reason for restoration failures, this novel calcium phosphate-rechargeable and antibacterial adhesive is promising for a wide range of tooth-restoration applications to inhibit caries.
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Acknowledgements
We thank Dr. Lin Wang for his assistance, and Esstech and Caulk/Dentsply for donating materials.
Funding
This study was funded by the NIH, grant number R01 DE17974 (HX) and a bridge grant (HX) from the University of Maryland School of Dentistry.
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Conceptualization by Faisal al-Qarni and Hockin H. K. Xu; methodology by Faisal al-Qarni, Yousif Al-Dulaijan, Michael Weir, and Mary A. Melo; data curation by Faisal al-Qarni and Yousif Al-Dulaijan; writing—original draft preparation by Faisal al-Qarni, and Khalid S. Almulhim; writing—review and editing by Faisal al-Qarni, Khalid S. Almulhim, and Hockin H. K. Xu; supervision: Hockin H. K. Xu. All authors have read and agreed to the published version of the manuscript.
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al-Qarni, F., Weir, M., Melo, M.A. et al. Novel calcium phosphate ion-rechargeable and antibacterial adhesive to inhibit dental caries. Clin Oral Invest 26, 313–323 (2022). https://doi.org/10.1007/s00784-021-04002-7
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DOI: https://doi.org/10.1007/s00784-021-04002-7