Novel self-healing dental luting cements with microcapsules for indirect restorations

Junling Wu, Qiang Zhang, Michael D. Weir, Thomas W. Oates, Chuanjian Zhou, Xiaofeng Chang, Hockin H.K. Xu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Objectives: Dental luting cements are widely used to bond indirect restorations to teeth. Microcracks often lead to cement failures. The objectives of this study were to develop the first self-healing luting cement, and investigate dentin bond strength, mechanical properties, crack-healing, and self-healing durability in water-aging for 6 months. Methods: Microcapsules of poly(urea-formaldehyde) (PUF) shells with triethylene glycol dimethacrylate (TEGDMA) as healing liquid were synthesized. Cement contained bisphenol A glycidyl dimethacrylate, TEGDMA, 4-methacryloyloxyethyl trimellitic and glass fillers. Microcapsules were added at 0%, 2.5%, 5%, 7.5%, 8.5%, 9.5% and 10%. Dentin shear bond strength was measured using extracted human teeth. Flexural strength and elastic modulus were measured. Single edge V-notched beams were used to measure fracture toughness (KIC) and self-healing. Specimens were water-aged at 37°C for 6 months and then tested for self-healing durability. Results: Adding 7.5% microcapsules into cement achieved effective self-healing, without adverse effects on dentin bond strength and virgin mechanical properties (p. >. 0.1). Excellent self-healing of 68%-77% recovery was obtained. Six months of water-aging did not decrease the self-healing efficiency, compared to 1 d (p. >. 0.1), indicating that the self-healing property did not degrade in water-aging. Conclusions: A self-healing dental luting cement was developed for the first time. It contained fine microcapsules and exhibited an excellent self-healing efficiency, even after being immersed in water for 6 months. Clinical significance: The self-healing cement is promising for cementing crowns and bridges and other adhesive cement applications, to heal cracks and increase restoration longevity.

Original languageEnglish (US)
JournalJournal of Dentistry
DOIs
StateAccepted/In press - 2017
Externally publishedYes

Keywords

  • Mechanical property recovery
  • Microcapsules
  • Polymerizable healing liquid
  • Self-healing dental luting cements
  • Water-aging

ASJC Scopus subject areas

  • Dentistry(all)

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