Journal article
Which dentine analogue material can replace human dentine for crown fatigue test?
DENTAL MATERIALS, v 39(1)
Jan 2023
PMID: 36503862
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Objective: To seek dentine analogue materials in combined experimental, analytical, and numerical approaches on the mechanical properties and fatigue behaviours that could replace human dentine in a crown fatigue laboratory test.Methods: A woven glass fibre-filled epoxy (NEMA grade G10; G10) and a glass fibre -re-inforced polyamide-nylon (30% glass fibre reinforced polyamide-nylon 6,6; RPN) were in-vestigated and compared with human dentine (HD). Flexural strength and elastic modulus (n = 10) were tested on beam-shaped specimens via three-point bending, while indentation hardness (n = 3) was tested after fracture. Abutment substrates of G10, RPN and HD were prepared and resin-bonded with monolithic lithium disilicate crowns (n = 10), then sub-jected to wet cyclic loading in a step-stress manner (500 N initial load, 100 N step size, 100,000 cycles per step, 20 Hz frequency). Data were statistically analysed using Kruskal-Wallis one-way ANOVA followed by post-hoc comparisons (alpha = 0.05). Survival probability estimation was performed by Mantel-Cox Log-Rank test with 95% confidence intervals. The fatigue failure load (FFL) and the number of cycles until failure (NCF) were evaluated with Weibull statistics. Finite Element Models of the fatigue test were established for stress distribution analysis and lifetime prediction. Fractographic observations were qualitatively analysed.Results: The flexural strength of HD (164.27 +/- 14.24 MPa), G10 (116.48 +/- 5.93 MPa), and RPN (86.73 +/- 3.56 MPa) were significantly different (p < 0.001), while no significant difference was observed in their flexural moduli (p = 0.377) and the indentation hardness between HD and RPN (p = 0.749). The wet cyclic fatigue test revealed comparable mean FFL and NCF of G10 and RPN to HD (p = 0.237 and 0.294, respectively) and similar survival probabilities for the three groups (p = 0.055). However, RPN promotes higher stability and lower deviation of fatigue test results than G10 in Weibull analysis and FEA. Significance: Even though dentine analogue materials might exhibit similar elastic proper-ties and fatigue performance to human dentine, different reliabilities of fatigue on crown -dentine analogues were shown. RPN seems to be a better substrate that could provide higher reliability and predictability of laboratory study results.(c) 2022 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.
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Details
- Title
- Which dentine analogue material can replace human dentine for crown fatigue test?
- Publication Details
- DENTAL MATERIALS, v 39(1)
- Publisher
- ELSEVIER SCI LTD; OXFORD
- Grant note
- This manuscript is prepared in the partial fulfilment of the Doctor of Philosophy for the first author. The authors grate- fully acknowledge the dental technology laboratory of Prince Philip Dental Hospital for the technical support on the man- ufacturing of restorations. This study was financially sup-ported by the General Research Fund [Hong Kong SAR, Grant number 17120220] .
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Drexel University
- Web of Science ID
- WOS:000922766600001
- Scopus ID
- 2-s2.0-85145290375
- Other Identifier
- 991021861168104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Dentistry, Oral Surgery & Medicine
- Materials Science, Biomaterials