Regulated fracture in tooth enamel: A nanotechnological strategy from nature

Ghadimi, Elnaz; Eimar, Hazem; Song, Jun; Marelli, Benedetto; Ciobanu, Ovidiu; Abdallah, Mohamed‐Nur; Stähli, Christoph; Nazhat, Showan N.; Vali, Hojatollah

doi:10.1016/j.jbiomech.2014.04.005

Cited by 9 publications

(5 citation statements)

References 54 publications

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“…The crystallinity of enamel has been widely reported to play an extremely important role in its mechanical properties 19 20 . Given that, the reduction in crystallinity indicated decreased mechanical properties, such as a reduction in hardness 21 . Sound enamel with a high crystallinity shows excellent mechanical and anti-wear properties.…”

Section: Discussionmentioning

confidence: 99%

Effect of gamma irradiation on the wear behaviour of human tooth enamel

Qing

Huang

Gao

et al. 2015

Sci Rep

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Radiotherapy is a frequently used treatment for oral cancer. Extensive research has been conducted to detect the mechanical properties of dental hard tissues after irradiation at the macroscale. However, little is known about the influence of irradiation on the tribological properties of enamel at the micro- or nanoscale. Therefore, this study aimed to investigate the effect of gamma irradiation on the wear behaviour of human tooth enamel in relation to prism orientation. Nanoscratch tests, surface profilometer and scanning electron microscope (SEM) analysis were used to evaluate the friction behaviour of enamel slabs before and after treatment with identical irradiation procedures. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were performed to analyse the changes in crystallography and chemical composition induced by irradiation. Surface microhardness (SMH) alteration was also evaluated. The results showed that irradiation resulted in different scratch morphologies, friction coefficients and remnant depth and width at different loads. An inferior nanoscratch resistance was observed independent of prism orientation. Moreover, the variation of wear behaviours was closely related to changes in the crystallography, chemical composition and SMH of the enamel. Together, these measures indicated that irradiation had a direct deleterious effect on the wear behaviour of human tooth enamel.

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Section: Discussionmentioning

confidence: 99%

Effect of gamma irradiation on the wear behaviour of human tooth enamel

Qing

Huang

Gao

et al. 2015

Sci Rep

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“…A Vickers microhardness indenter (Clark CM100 AT, HT‐CM‐95605, Shawnee Mission, KS) was employed on the polished surfaces of the Co–Cr samples. Tooth enamel sections fixed in resin blocks were also analyzed for comparison . Nine measurements were obtained per specimen ( n = 3) under indentation load of 500 g for 10 s of dwell time.…”

Section: Methodsmentioning

confidence: 99%

“…Tooth enamel sections fixed in resin blocks were also analyzed for comparison. 33,34 Nine measurements were obtained per specimen (n 5 3) under indentation load of 500 g for 10 s of dwell time. Computer software (Vision PE 3.5, Clemex Technologies Inc., Shawnee Mission, KS) was used to measure the microhardness value at the site of indentation from images captured by a built-in camera.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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Removable partial dentures (RPDs) are traditionally made using a casting technique. New additive manufacturing processes based on laser sintering has been developed for quick fabrication of RPDs metal frameworks at low cost. The objective of this study was to characterize the mechanical, physical, and biocompatibility properties of RPD cobalt-chromium (Co-Cr) alloys produced by two laser-sintering systems and compare them to those prepared using traditional casting methods. The laser-sintered Co-Cr alloys were processed by the selective laser-sintering method (SLS) and the direct metal laser-sintering (DMLS) method using the Phenix system (L-1) and EOS system (L-2), respectively. L-1 and L-2 techniques were 8 and 3.5 times more precise than the casting (CC) technique (p < 0.05). Co-Cr alloys processed by L-1 and L-2 showed higher (p < 0.05) hardness (14-19%), yield strength (10-13%), and fatigue resistance (71-72%) compared to CC alloys. This was probably due to their smaller grain size and higher microstructural homogeneity. All Co-Cr alloys exhibited low porosity (2.1-3.3%); however, pore distribution was more homogenous in L-1 and L-2 alloys when compared to CC alloys. Both laser-sintered and cast alloys were biocompatible. In conclusion, laser-sintered alloys are more precise and present better mechanical and fatigue properties than cast alloys for RPDs. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1174-1185, 2018.

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“…Furthermore, the crystallites within enamel undergo an expansion with aging [49]. A recent study by Ghadimi et al [50] reported that the indentation fracture resistance of enamel is inversely proportional to the size of the mineral crystals. Hence the increase in the crystallite dimensions and “densification” could contribute to the reduction of the inherent fracture toughness with age.…”

Section: Discussionmentioning

confidence: 99%

On the importance of aging to the crack growth resistance of human enamel

2016

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With improvements in oral health and an overall increase in quality of life, the percentage of fully or largely dentate seniors is increasing. Understanding the effects of aging on the mechanical properties of teeth is essential to the maintenance of lifelong oral health. In this investigation the effects of aging on the fracture toughness of human enamel were evaluated from incremental crack growth experiments performed on tissue of donor teeth representing “young” (17≤ age ≤ 25) and “old” (age ≥ 55) age groups. Results showed that the old enamel exhibited significantly lower resistance to fracture than that of the young tissue in two orthogonal directions of crack growth. For crack growth transverse to the enamel rods, the fracture toughness of the old enamel (0.37±0.15 MPa•m0.5) was nearly 70% lower than that of tissue from the young teeth (1.23±0.20 MPa•m0.5). Based on results from a mechanistic analysis of crack growth, the reduction in fracture resistance is attributed to a decreased in the degree of extrinsic toughening. The practice of restorative dentistry should account for these changes in tooth tissues in the treatment of senior patients.

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Regulated fracture in tooth enamel: A nanotechnological strategy from nature

Cited by 9 publications

References 54 publications

Effect of gamma irradiation on the wear behaviour of human tooth enamel

Effect of gamma irradiation on the wear behaviour of human tooth enamel

Removable partial denture alloys processed by laser‐sintering technique

On the importance of aging to the crack growth resistance of human enamel

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