Physical and mechanical properties of a dental resin adhesive containing hydrophobic chitin nanocrystals - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Dental Materials Year : 2022

Physical and mechanical properties of a dental resin adhesive containing hydrophobic chitin nanocrystals

Abstract

Objectives: In this paper we propose embedding natural fillers, such as pristine and func-tionalized chitin nanocrystals, into resin adhesives to produce photopolymerizable dental filled adhesives with enhanced biocompatibility, hydrophobicity, mechanical resistance, and anti-bacterial properties. Methods: Chitin nanocrystals (ChNC) were functionalized with decanoyl chloride and methacrylic anhydride to produce ChNC-C10 and ChNC-MA, respectively. These hydro-phobically functionalized chitin nanocrystals were incorporated into a resin adhesive at concentrations of 0.5-3.0 wt% to assess the materials' physical and mechanical properties through Fourier-transform infrared (FTIR) spectroscopy, solid-state NMR spectroscopy, X-ray diffraction (XRD), elemental analysis, scanning electron microscopy (SEM), thermo-gravimetric analysis (TGA), flexural strength, microhardness, and water sorption tests. Results: The analytical techniques confirmed the successful preparation of chitin nano -crystals from commercial chitin powder derived from shrimp shells and the efficient hy-drophobization of their surface. Electron microscope images indicated that the increased hydrophobicity of ChNC-C10 promotes the formation of layered structures throughout the resin adhesive, while ChNC-MA tends to form aggregates in the matrix. Adhesives filled with ChNC-C10 enhanced their flexural strength, microhardness, and thermal stability and decreased their water sorption and degree of conversion. Adhesives filled with ChNC-MA resulted in improvements in microhardness, in water sorption and degree of conversion, although they did not exhibit augmentation of their flexural strength and thermal stability. Significance: In light of the improved physical and mechanical properties with respect to the control, resin adhesives filled with anti-bacterial chitin nanocrystals are promising new materials for dental applications, especially those filled with low/moderate amounts of ChNC-C10.(c) 2022 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.
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Dates and versions

hal-04308923 , version 1 (27-11-2023)

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Francesco D’acierno, Leslie Liu, Thanh-Dinh Nguyen, Carl Michal, Regina Palma-Dibb, et al.. Physical and mechanical properties of a dental resin adhesive containing hydrophobic chitin nanocrystals. Dental Materials, 2022, 38 (12), pp.1855-1865. ⟨10.1016/j.dental.2022.09.013⟩. ⟨hal-04308923⟩

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