Hydroxyapatite synthesis and the benefits of its blend with calcium aluminate cement

Oliveira, I. R.; Andrade, Talita Luana de; Araujo, K.C.M.L.; Luz, A.P.; Pandolfelli, V. C.

doi:10.1016/j.ceramint.2015.10.056

Cited by 30 publications

(12 citation statements)

References 22 publications

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“…A previous study by the present authors [28] indicated that CACH mixtures containing commercial or synthesized hydroxyapatite showed lower porosity and pore size distribution after their interaction with SBF. This behavior was associated to apatite precipitation on the materials' surface, which was detected by following the pH and calcium ions concentration evolution in the liquid medium.…”

Section: Resultsmentioning

confidence: 71%

Calcium aluminate cement-based compositions for biomaterial applications

Parreira

Andrade

Luz

et al. 2016

Ceramics International

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Section: Resultsmentioning

confidence: 71%

Calcium aluminate cement-based compositions for biomaterial applications

Parreira

Andrade

Luz

et al. 2016

Ceramics International

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“…The presence of 50 wt% nano-size HA in composite material (CA/HA) will act as a filler material beside its role in improving the biocompatibility of calcium aluminate cement. This nano particles of HA will be rearranged in the pore system of the hardened paste, that enhances the density values especially at later ages of hydration 14 . The continuous decrease of the micro-hardness data (Fig.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…This retardation of setting time may be acceptable in dental biomedical applications as calcium aluminate phase has a relatively fast curing process during the first 24 h [27][28][29] . The setting process of CA cement starts immediately after mixing with water through, first, dissolution followed by precipitation of the major hydration phase CAH 10 , C 2 AH 8 and AH 3 , the replacement of 50% of the base calcium aluminate cement by hydroxyapatite as a hydrated calcium phosphate will perhaps adversely affect the physical and mechanical properties of this type of cementing materials as a softening and dissolution of HA also will start upon mixing with water 14 . Curing of pastes prepared from the two composites was carried out at 37°C in distilled water and artificial saliva solution in order to investigate the hydration behavior as influenced by hydration medium.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

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Evaluation of Calcium Aluminate/Calcium Phosphate Based Bio-Cements as Root-End Filling Material

Radwan¹,

El-Hamid²,

Abo-Almaged³

et al. 2017

Orient. J. Chem

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Nano-particles of pure single phase calcium aluminate (CA) were prepared via solid state reaction at high temperature. An ultra-pure nano-size hydroxyapatite (HA) prepared by sol-gel method was used to formulate a composite of 1:1 CA: HA. Setting times, micro-hardness, bulk density, calcium ion and phosphorus ion concentration, XRD, FTIR and scanning electron microscopy (SEM) were investigated. The results showed that the substitution of 50% by weight of pure calcium aluminate cement (CA) by nano-size hydroxyapatite (HA) has a retardation effect on setting process. The use of artificial saliva solution as hydration medium enhances the hydration process of both synthesized calcium aluminate based materials due to the formation of more hydrated compounds. Curing of calcium aluminate cement in hot and humid conditions, resulting in hardness loss and high porosity due to the conversion process, in which the compounds CAH 10 and C 2 AH 8 (hexagonal crystals) are converted into the more stable compound C 3 AH 6 (cubic crystals). The SEM studies indicated that the presence of nano-particles of hydroxyapatite in CA/ HA composite facilitated the precipitation of hydroxyapatite-like active layer, suggesting that pure CA cement has some distinctive physico-mechanical properties make it suitable for use as root end filling materials in dental applications.

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“…While the field of material science has produced no ideal material, synthetic hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has become one of the most interesting bioceramics, being similar to inorganic components from the human body [4][5][6][7][8]. Its ability to generate hard tissue, thus increasing the bioactivity of dental cements is of particular significance.…”

Section: Introductionmentioning

confidence: 99%

Portland cement enriched with hydroxyapatite for endodontic applications

Avram¹,

Gorea²,

Balint³

et al. 2017

Studia UBB Chemia

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Endodontic cement based on calcium silicate has been the focus of many studies. However, the quality of resulted endodontic cement needs improvement. This paper focuses on endodontic cement obtained from Portland cement enriched with two types of hydroxyapatite, simple and doped with 5% Zn. Hydroxyapatites were synthesized using a wet precipitation method and investigated by X-ray diffraction, FTIR, TEM and AFM. From a structural point of view, both hydroxyapatites were obtained in a single crystalline phase, containing particles in the nanometric range, as judged by XRD, TEM and AFM. FTIR analysis presents O-H and P-O bands specific to those in pure hydroxyapatite, confirming a hydroxyapatite lattice in both materials. Several experimental compositions of commercial Portland cement mixed with hydroxyapatite were prepared. The influence of stoichiometric and Zn doped hydroxyapatite on the resulted endodontic cement was observed in the setting time. The setting time for both cements decreased exponentially at both temperatures (22 ⁰C and 37 ⁰C). The normal consistency water remains constant for all experimented slurries.

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Hydroxyapatite synthesis and the benefits of its blend with calcium aluminate cement

Cited by 30 publications

References 22 publications

Calcium aluminate cement-based compositions for biomaterial applications

Calcium aluminate cement-based compositions for biomaterial applications

Evaluation of Calcium Aluminate/Calcium Phosphate Based Bio-Cements as Root-End Filling Material

Portland cement enriched with hydroxyapatite for endodontic applications

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