Mode-I Fracture Toughness Analysis of n-HAPs Filled Dental Restorative Composites

Autor: Swati Gangwar, Sukriti Yadav
Rok vydání: 2020
Předmět:
Zdroj: Silicon. 13:1347-1358
ISSN: 1876-9918
1876-990X
DOI: 10.1007/s12633-020-00521-2
Popis: Fracture toughness of dental restoratives is of greater relevance, especially in stress relevance applications, i.e., resistance to crack propagation. This work aims to determine the mode I fracture toughness (KIC), void contents, and Vickers micro-hardness of the MPTS (3-methacryloxypropyl) trimethoxy silane) and APTES (3-aminopropyl) triethoxysilane) treated nanohydroxyapatite (n-HAPs) filled Dental Restorative Composites (DRCs). The void contents of the dental restoratives were determined by calculating theoretical and experimental densities of the material whereas, microhardness and mode I fracture toughness was determined by using the indentation and single edge notched bend (SENB) method after storing all the samples for 24 h in distilled water respectively. The result shows that void contents and microhardness of fabricated dental restoratives continue to increase with an increase in the weight fraction of fillers. And the fracture toughness (KIC) of both the series increased with the weight fraction of fillers up to a maximum value of 2.883 ± 0.19 MPa√m for (DRC-8 M) and 2.536 ± 0.18 MPa√m for DRC-8A after that KIC shows a marginal decrease in its value for 12 wt.% of fillers. The fractography of the DRCs reveals the various energy dissipating mechanism developed during crack propagation and contribute to the improved value of fracture toughness as compared to unfilled dental restoratives, i.e., crack deflection and crack pinning effect of hydroxyapatite nanoparticles.
Databáze: OpenAIRE
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