Durability of self-healing dental composites: A comparison of performance under monotonic and cyclic loading.

Autor: Yahyazadehfar M; Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA., Huyang G; Dr. Anthony Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD, USA., Wang X; Dr. Anthony Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD, USA., Fan Y; Department of Restorative Sciences & Biomaterials, School of Dental Medicine, Boston University, Boston, MA, USA., Arola D; Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA; Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, WA, USA; Oral Health Sciences, School of Dentistry, University of Washington, Seattle, WA, USA. Electronic address: darola@uw.edu., Sun J; Dr. Anthony Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD, USA. Electronic address: jsun@nist.gov.
Jazyk: angličtina
Zdroj: Materials science & engineering. C, Materials for biological applications [Mater Sci Eng C Mater Biol Appl] 2018 Dec 01; Vol. 93, pp. 1020-1026. Date of Electronic Publication: 2018 Aug 30.
DOI: 10.1016/j.msec.2018.08.057
Abstrakt: Durability is an important quality of dental restorative materials, and the ability to autonomously heal damage incurred during their oral function is highly desirable.
Objective: The objective was to evaluate the improvement in durability of self-healing dental composites (SHDCs) in terms of their resistance to fracture and capacity for healing of damage under monotonic and cyclic loading.
Methods: SHDCs were prepared by incorporating dental resin composites with microcapsules containing healing liquid. Control specimens with the same mass fraction (5% and 25%) of microcapsules filled with water were also evaluated. Two sets of SHDCs were distinguished by the silane coupling agents that functionalized and bonded the microcapsules to resin network. One set used a methacrylate silane (MA-silane) that connected resin network through covalent bonds, and the other used a H-bonding forming hydroxyl silane (OH-silane). The fatigue crack growth resistance was assessed in terms of the threshold stress intensity range and the conventional Paris Law parameters. Cyclic loading was conducted at 5 Hz with maximum cyclic load ranged between approximately 1 N and 5 N. The efficiency of the autonomous healing was determined per the recovering of the fracture toughness and the extension of fatigue life.
Results: The SHDCs with 5 wt% of healing microcapsules exhibited a larger fracture toughness than those with 25 wt% microcapsules. MA-silane SHDCs had approximately five times more responsive microcapsules triggered by fracturing of the composites. Consequently, the MA-silane SHDCs with 5 wt% of microcapsules achieved the best performance in terms of fracture toughness and healing efficiency. In regards to the fatigue crack growth behavior, there was a significant increase in the resistance to fatigue crack growth and 580 ± 15% improvement in the fatigue life.
Significance: Strong silanization is vital in SHDCs to simultaneously achieve clinically applicable mechanical performance and substantial healing capability. Moreover, the evaluation of self-healing under cyclic loading is a promising tool in quantifying the degree of fracture-induced healing.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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