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Self-healing Adhesive With Antibacterial Activity in Water-Aging for 12 Months

Self-healing Adhesive With Antibacterial Activity in Water-Aging for 12 Months

Junling Wu, Chuanjian Zhou, Jianping Ruan, Michael D Weir, Franklin Tay, Jirun Sun, Mary Anne S Melo, Thomas W Oates, Xiaofeng Chang, Hockin H K Xu

Dent Mater. 2019 Aug;35(8):1104-1116.

PMID: 31104922

Abstract:

Objective:
Secondary caries and micro-cracks are the main limiting factors for dentin bond durability. The objectives of this study were to develop a self-healing adhesive containing dimethylaminohexadecyl methacrylate (DMAHDM) and nanoparticles of amorphous calcium phosphate (NACP), and investigate the effects of water-aging for 12 months on self-healing, dentin bonding, and antibacterial properties for the first time.
Methods:
Microcapsules were synthesized with poly (urea-formaldehyde) (PUF) shells containing triethylene glycol dimethacrylate (TEGDMA) and N,N-dihydroxyethyl-p-toluidine (DHEPT). The adhesive contained 7.5% microcapsules, 10% DMAHDM, and 20% NACP (all mass). Specimens were water-aged at 37 °C for 1 day to 12 months. Dentin bond strength was measured using extracted human teeth. A single-edge-V-notched-beam (SEVNB) method was used to measure fracture toughness KIC and self-healing efficiency. A dental plaque microcosm biofilm model was used with human saliva as inoculum.
Results:
The microcapsules + DMAHDM + NACP group showed no decline in dentin bond strength after water-aging for 12 months, which was significantly higher than that of other groups without DMAHDM (p < 0.05). A self-healing efficiency of 67% recovery in KIC was obtained even after 12 months of water immersion, indicating that the self-healing ability was not lost in water-aging (p > 0.1). The bacteria-killing ability of this adhesive did not decline from 1 day to 12 months (p > 0.1), with biofilm CFU reduction by 3-4 orders of magnitude after the resin was water-aged for 12 months, compared to control resin.
Significance:
This novel adhesive with triple merits of self-healing, antibacterial and remineralization functions showed an excellent long-term durability in water-aging for 12 months. This multifunctional adhesive has the potential for dental applications to heal cracks, inhibit bacteria, provide ions for remineralization, and increase the restoration longevity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS2121353	Formaldehyde in Water			Price
AS23105	Glycolate Standard for IC			Price

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