Enamel—A “metallic-like” deformable biocomposite

He, Long; Swain, Michael V.

doi:10.1016/j.jdent.2006.12.002

Cited by 129 publications

(88 citation statements)

References 29 publications

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“…Excessive wear of the opposing teeth can be prevented by the use of hybrid ceramics with lower hardness values instead of conventional feldspathic ceramics, particularly in adolescent patients [22]. Furthermore, hybrid ceramics are claimed to exhibit indentation creep responses similar to those of human enamel and superior stress redistribution [35].…”

Section: Discussionmentioning

confidence: 99%

Adhesion of metal brackets to glassy matrix and hybrid CAD/CAM materials after different physico-chemical surface conditioning

Dilber

Aglarci

Akın

et al. 2016

Journal of Adhesion Science and Technology

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This study compared the adhesion of metal brackets bonded to different CAD/CAM materials after various surface conditioning methods. CAD/CAM blocks (N=204, n=17 per group) of a) VITA Mark II (VM), b) IPS e.max CAD (IP), c) Lava Ultimate (LU), and d) VITA ENAMIC (VE) were conditioned with one of the following methods: C-Control: (fine diamond bur); CJ: (fine diamond bur+air-abrasion with 30 µm SiO 2 +silane), and HF: (fine diamond bur+9.5% hydrofluoric acid+silane). Metal brackets were bonded to the conditioned surfaces of the specimens, stored in artificial saliva for 24 h at 37°C and thermocycled (x1000). Subsequently, the brackets were debonded under shear in a Universal Testing Machine (1 mm/min). Failure types were analyzed under scanning electron microscope. Data were analyzed using two-way ANOVA and Tukey`s tests (α=0.05). Two-parameter Weibull distribution values, including the Weibull modulus, scale, and shape, were calculated. Mean bond strength (MPa) values were significantly affected by the surface conditioning method (p<0.001) but not the CAD/CAM material type (p=0.052).Bond strengths for all CJ and HF-conditioned specimens were two-fold higher (11.83±1.95 -9.44±1.63) than those for control specimens with all materials (4.73±0.93 -6.02±0.69). Lower mean values were obtained in LU-CJ (9.78±1.61) and LU-HF (9.44±1.63) than those for other groups (11.83±1.95 -10.93±1.33) groups (p<0.05). Weibull distribution showed higher shape values for VM-CJ (11.26) and VM-HF (8.87) than those for other groups (0.82-1.83). In control groups, exclusively adhesive and after conditioning mainly mixed failures were observed. Chairside silica coating or HF conditioning significantly improved metal bracket adhesion to both glassy matrix and hybrid CAD/CAM materials tested, with the most reliable adhesion being observed for feldspathic ceramic.

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Section: Discussionmentioning

confidence: 99%

Adhesion of metal brackets to glassy matrix and hybrid CAD/CAM materials after different physico-chemical surface conditioning

Dilber

Aglarci

Akın

et al. 2016

Journal of Adhesion Science and Technology

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“…Other components of enamel include remnants of the organic matrix and loosely bound water molecules. Interestingly, from the mechanical point of view, dental enamel was found to be a ''metalliclike'' deformable biocomposite, because enamel was found to have a similar stress-strain response to that of cast alloy and gold alloy, all of which showed work-hardening effect (He and Swain 2007). The crystals of biological apatite of enamel are much larger as evidenced by higher crystallinity (reflecting greater crystal size and perfection) demonstrated in their X-ray diffraction patterns than those of bone and dentine.…”

Section: Teethmentioning

confidence: 99%

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Dorozhkin¹

2017

Morphologie

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“…At the micro-scale, prisms are assembled into prism bands, which present different arrangements across the thickness of the enamel layer. These compositional and structural characteristics endow enamel special properties such as anisotropic elastic modulus, effective viscoelastic properties, much higher fracture toughness and stress-strain relationships more similar to metals than ceramics [228].…”

Section: Teethmentioning

confidence: 99%

Nanodimensional and Nanocrystalline Calcium Orthophosphates

Dorozhkin¹

2012

AJBE

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Nano-sized particles and crystals play an important role in the formation of calcified tissues of various animals. For example, nano-sized and nanocrystalline calcium orthophosphates in the form of apatites of biological origin represent the basic inorganic building blocks of bones and teeth of mammals. Namely, according the recent developments in biomineralization, tens to hundreds nanodimensional crystals of a biological apatite are self-assembled into these complex structures. This process occurs under a strict control by bioorganic matrixes. Furthermore, both a greater viability and a better proliferation of various types of cells have been detected on smaller crystals of calcium orthophosphates. Thus, the nano-sized and nanocrystalline forms of calcium orthophosphates have a great potential to revolutionize the hard tissue-engineering field, starting from bone repair and augmentation to controlled drug delivery systems. This review reports on current state of the art and recent developments on the subject, starting from synthesis and characterization to biomedical and clinical applications. Furthermore, the review also discusses possible directions for future research and development.

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Enamel—A “metallic-like” deformable biocomposite

Cited by 129 publications

References 29 publications

Adhesion of metal brackets to glassy matrix and hybrid CAD/CAM materials after different physico-chemical surface conditioning

Adhesion of metal brackets to glassy matrix and hybrid CAD/CAM materials after different physico-chemical surface conditioning

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

Nanodimensional and Nanocrystalline Calcium Orthophosphates

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