Electron microscopy analysis of the thermal phase transition from hydroxyapatita to β‐TCP observed in human teeth

Reyes‐Gasga, J.; Becerril, Nancy Vargas

doi:10.1111/jmi.12839

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…In the present case, the phase transition occurs at 1400°C but in some reports this transition is seen in much lower temperature (700°C) at organic HAP samples (dental enamel and human bone) 27 . The presence of β‐TCP may be due to dehydration, decarbonization, and transformation of the carbonate groups (CO 3 2‐ ) in the HAP crystals 28 . Figure 3B shows the magnified XRD patterns of HAP‐1.…”

Section: Resultsmentioning

confidence: 55%

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Synthesis of n‐HAP using different precursors and dependence of Vickers hardness on the structure by tuning sintering temperature

Ishtiaque

Das

Hoque

et al. 2021

Int J Applied Ceramic Tech

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Three sets of starting materials Ca(NO3)2·4H2O and (NH4)2HPO4; Ca(OH)2 and H3PO4; Ca(OH)2 and (NH4)2HPO4 were chosen for the preparation of different precursors of hydroxyapatite nanoparticles (n‐HAP) by wet chemical precipitation technique denoted by HAP‐1, HAP‐2, HAP‐3. X‐ray diffraction (XRD) studies show that n‐HAP of all three types exhibited single‐phase in the as‐prepared condition. Transmission electron microscopy (TEM), high‐resolution transmission electron microscopy (HRTEM), and selected area electron diffraction (SAED) studies of as‐prepared samples showed characteristic needle‐like particles with a width of 5 nm, which were fully crystalline exhibited by the lattice fringe in HRTEM, and single‐phase demonstrated by SAED patterns. The samples were pelletized and annealed at varying temperatures in the range of 600°C–1400°C. The results indicated that HAP‐1 and HAP‐3 samples showed phase decomposition at 1400°C to form β‐tricalcium phosphate (β‐TCP) while for HAP‐2 no such decomposition occurred up to 1400°C. Data from the Vickers hardness test revealed that the hardness value up to 2.5 GPa was attained at the sintering temperature of 1200°C for HAP‐1 and HAP‐3. The hardness values are consistently higher for HAP‐2 than HAP‐1 and HAP‐3 at all sintering temperatures and attained a value of 3 GPa at 1200°C. Thus, synthesizing n‐HAP by using H3PO4; Ca(OH)2 bestows highest Vickers hardness.

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Section: Resultsmentioning

confidence: 55%

“…27 The presence of β-TCP may be due to dehydration, decarbonization, and transformation of the carbonate groups (CO 3 2-) in the HAP crystals. 28 Fig-…”

Section: X-ray Diffractionmentioning

confidence: 99%

Synthesis of n‐HAP using different precursors and dependence of Vickers hardness on the structure by tuning sintering temperature

Ishtiaque

Das

Hoque

et al. 2021

Int J Applied Ceramic Tech

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“…These peaks, which are shown by black arrows for S 8 sample (continuous: main peaks and dash: weak peaks) in Figure 2C, are in agreement with previous research. 19,[32][33][34][35] Reyes-Gasga and Becerril 35 extracted HA from human permanent molar teeth by heat treatment at different temperatures. The authors similarly found the TCP peaks at higher temperatures (1000°C and 1200°C).…”

Section: Resultsmentioning

confidence: 99%

Low‐cost synthesis of nano‐hydroxyapatite from carp bone waste: Effect of calcination time and temperature

Bahraminasab

Doostmohammadi

Alizadeh

2021

Int J Applied Ceramic Tech

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is a common and popular biomaterial for bone regeneration. About 70% of bone structure and essentially all of the enamel in teeth are composed of HA. It has been used in orthopedic and dental applications such as dental implants, bone grafts, orthopedic implants, and bone scaffolds. [1][2][3][4][5] The reason is the excellent bioactivity, adequate mechanical characteristics, osteoconductive, and angiogenic properties, without toxicity, inflammatory, or antigenic reactions. 6 Nano-hydroxyapatite (nano-HA), particularly, is considered as one of the most biocompatible and bioactive materials that has been used and accepted in orthopedics and dentistry. [7][8][9] For example, it has been extensively used in periodontics and in oral and maxillofacial surgical procedures. The inorganic part of bone extra cellular matrix (ECM) contains nano-sized crystallites of calcium phosphate similar to HA. 10 Nano-HA has an outstanding osteoinductive capacity and improves bone-to-implant integration. 11 This nanomaterial also has been employed in the products used for oral care to treat the dentin hypersensitivity (DH) and promote enamel demineralization. It has been shown that nano-HA is capable of reducing the pain associated with DH because the nanoparticles are very small and can readily enter and fill the tubules in dentin. These nanoparticles precipitate inside the dentin tubules and block the nerves interaction with the external stimuli. They can also set down onto the surface of enamel and demineralize the early enamel caries, leading to a new apatite layer formation, which subsequently increases the enamel surface hardness and therefore prevents the tooth decay. These benefits are due to high similarity of morphology and crystal structure of nano-HA with tooth enamel. 12,13 HA can be simply synthesized or extracted from the natural sources, including eggshell, seashell, bovine, or fish bones. [14][15][16][17][18] Fish bone as an alternative natural source for HA production recently has received a lot of attention because of low cost and easy manufacturing regarding the many

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“…Some studies have addressed the growing hydration of the samples joined with the Mg enrichment of apatites [30]. The meaningful crystallographic transformation of apatite into β-tricalcium phosphate (β-TCP) occurs under the influence of small amounts of Mg and elevated temperatures [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Contribution to Knowledge on Bioapatites: Does Mg Level Reflect the Organic Matter and Water Contents of Enamel?

Lasota,

Kuczumow,

Gorzelak

et al. 2023

IJMS

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The matter constituting the enamels of four types of organisms was studied. The variability of the ions was presented in molar units. It was proven that the changes in water contents of the enamel are significantly positively related to changes in Mg; inversely, there is also a strong connection with changes in Ca and P, the main components of bioapatite. The variability in the organic matter has the same strong and positive characteristics and is also coupled with changes in Mg contents. Amelogenins in organic matter, which synthesize enamel rods, likely have a role in adjusting the amount of Mg, thus establishing the amount of organic matter and water in the whole enamel; this adjustment occurs through an unknown mechanism. Ca, P, Mg, and Cl ions, as well as organic matter and water, participate in the main circulation cycle of bioapatites. The selection of variations in the composition of bioapatite occurs only along particular trajectories, where the energy of transformation linearly depends on the following factors: changes in the crystallographic d parameter; the increase in the volume, V, of the crystallographic cell; the momentum transfer, which is indirectly expressed by ΔsinΘ value. To our knowledge, these findings are novel in the literature. The obtained results indicate the different chemical and crystallographic affinities of the enamels of selected animals to the human ones. This is essential when animal bioapatites are transformed into dentistic or medical substitutes for the hard tissues. Moreover, the role of Mg is shown to control the amount of water in the apatite and in detecting organic matter in the enamels.

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Electron microscopy analysis of the thermal phase transition from hydroxyapatita to β‐TCP observed in human teeth

Cited by 9 publications

References 23 publications

Synthesis of n‐HAP using different precursors and dependence of Vickers hardness on the structure by tuning sintering temperature

Synthesis of n‐HAP using different precursors and dependence of Vickers hardness on the structure by tuning sintering temperature

Low‐cost synthesis of nano‐hydroxyapatite from carp bone waste: Effect of calcination time and temperature

Contribution to Knowledge on Bioapatites: Does Mg Level Reflect the Organic Matter and Water Contents of Enamel?

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