Developmental Study of Diopside for Use as Implant Material

1991 ◽  
Vol 252 ◽  
Author(s):  
Toru Nonami
Keyword(s):  
Fracture Toughness ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Powder Compact ◽  
Bending Strength ◽  
Close Contact ◽  
Sintered Body ◽  
Developmental Study ◽  
Implant Material

ABSTRACTDiopside was prepared sintering a powder compact of composition CaMgSi2O6 at 1573K for 2 hours. The bending strength of this sintered body was 300MPa and fracture toughness was 3.5MPam1/2. Diopside was soaked in a simulated body fluid at 309.5K. Three days later diopside formed hydroxyapatite (Hap) all over the surface [1]. Diopside implanted in rabbits came in close contact with the newly grown bone. EPMA spectral diagrams show a change of composition across the junction from the diopside to the newly grown bone [2].

Mechanical Properties and In Vitro Bioactivity of β-Tri Calcium Phosphate, Merwinite Nanocomposites

2011 ◽  
Vol 493-494 ◽  
pp. 582-587 ◽  
Author(s):  
Marziyeh Abbasi-Shahni ◽  
Saeed Hesaraki ◽  
Ali Asghar Behnam-Ghader ◽  
Masoud Hafezi-Ardakani
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sem Analysis ◽  
In Vitro Bioactivity ◽  
Hard Tissue ◽  
Calcium Phosphate Layer

In this study, nanocomposites based on of β-tri calcium phosphate (β-TCP) and 2.5-10 wt% merwinite nanoparticles were prepared and sintered at 1100-1300°c.The mechanical properties were investigated by measuring compressive strength and fracture toughness. Structural properties were evaluated by XRD, TEM and SEM analysis, and the in vitro bioactivity was studied by soaking the samples in simulated body fluid (SBF). The mechanical strength of the sintered samples wereincreased, by increasing the amount of merwinite phase up to 5 wt%, whereas it decreased when the samples were sintered at 1100 and 1200°c. Nanostructured calcium phosphate layer was formed on the surfaces of the nanocomposites within 1 day immersion in simulated body fluid. Because of appropriate mechanical properties the composite is suggested to be used as substitute for hard tissue.

The influence of titanate coupling agent on the performance of barium titanate/PMMA denture base nanocomposites after SBF storage

2020 ◽  
pp. 089270572096216
Author(s):  
Nidal Wanis Elshereksi ◽  
Andanastuti Muchtar ◽  
Che Husna Azhari
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Barium Titanate ◽  
Simulated Body Fluid ◽  
Coupling Agent ◽  
Potential Application ◽  
Body Fluid ◽  
Pure Pmma ◽  
Denture Base ◽  
Base Materials

Poly(methyl methacrylate) (PMMA)/nanobarium titanate (NBT) composite has potential application in denture base materials. The denture base materials should be stable in the wet environment and exhibit good mechanical properties. This study aimed to evaluate the effectiveness of titanate coupling agent (TCA) on NBT behavior after soaking in the simulated body fluid (SBF) and to determine the effect of SBF exposure on fracture toughness of the PMMA nanocomposites. Silanated (Si-NBT), titanated (Ti-NBT), and pure NBT (Un-NBT) at 5% concentration (by mass) were incorporated in the PMMA matrix. NBT was sonicated in MMA prior to mixing with PMMA. SBF absorption, solubility, and leaching were measured, and fracture toughness of the PMMA nanocomposites was evaluated after soaking. The results showed that Titanated samples displayed lower SBF absorption capability and solubility values than the silanated ones. Moreover, the leachability of filler elements (Ba and Ti) was substantially reduced by titanation (54% and 61%, respectively), whereas the Si-NBT/PMMA revealed values of 12.3% and 7% respectively. Significant differences in fracture toughness were observed among the tested samples after 6 weeks of aging in SBF ( p < 0.05). Although no notable changes in the KIC of pure PMMA and Un-NBT/PMMA samples were detected, KIC was improved by 20% after titanation. In addition, the fracture toughness of the titanated samples was higher than that of the silanated ones by 26%. In conclusion, TCA exhibited better stability in moisture than silane. Degradation resistance to moisture obtained with titanated NBT could lead to the promotion of clinical longevity of the composites.

Mechanical Properties of CaB6 Sintered Body

2005 ◽  
Vol 297-300 ◽  
pp. 2707-2712
Author(s):  
Guang Hui Min ◽  
Li Xia Yang ◽  
Hua Shun Yu ◽  
Jiande Han
Keyword(s):  
Fracture Toughness ◽  
Fracture Surface ◽  
Intergranular Fracture ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Fracture Morphology ◽  
Sintered Body ◽  
Full Density ◽  
Transgranular Fracture ◽  
Sintering Aid

In this paper, CaB6 sintered body was fabricated by hot-pressed sintering with/without nickel as a sintering aid. The microstructure and fracture morphology were observed by means of SEM. CaB6 polycrystalline hot-pressed at 2123K showed insufficient densification. Fracture surface revealed that the existence of pores and the poor grain boundaries made the occurrence of intergranular fracture. When 28wt% nickel was added, nearly full density was obtained, although the sintering temperature is 200K lower. Hardness, Bending strength and fracture toughness of polycrystalline CaB6 were measured. By adding the Ni in CaB6 matrix, the flexural strength and the fracture toughness were enhanced, and the ratio of transgranular to intergranular fracture type was increased notably. The fracture surface showed a transgranular fracture. The crack bridging, micro-cracking and crack deflecting were deemed as the contribution to the improved fracture toughness.

IN-VITRO BEHAVIOUR OF BIPHASIC CALCIUM PHOSPHATE WITH DIFFERENT RATIO OF SILICA CONTENT IN SIMULATED BODY FLUID

2015 ◽  
Vol 23 (1) ◽  
pp. 1-14
Author(s):  
Sudirman Sahid ◽  
◽  
Nor Shahida Kader Bashah ◽  
Salina Sabudin ◽  
◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Biphasic Calcium Phosphate ◽  
Silica Content

Phase evolution of hydroxapatite coatings suspension plasma sprayed using variable parameters in simulated body fluid

2010 ◽  
Vol 204 (8) ◽  
pp. 1236-1246 ◽  
Author(s):  
Romain d'Haese ◽  
Lech Pawlowski ◽  
Muriel Bigan ◽  
Roman Jaworski ◽  
Marc Martel
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Phase Evolution ◽  
Variable Parameters ◽  
Plasma Sprayed

scholarly journals Tetracalcium Phosphate/Monetite/Calcium Sulfate Hemihdrate Biocement Powder Mixtures Prepared by the One-Step Synthesis for Preparation of Nanocrystalline Hydroxyapatite Biocement-Properties and In Vitro Evaluation

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2137
Author(s):  
Lubomir Medvecky ◽  
Maria Giretova ◽  
Radoslava Stulajterova ◽  
Lenka Luptakova ◽  
Tibor Sopcak
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Calcium Sulfate ◽  
Powder Mixtures ◽  
Liquid Component ◽  
Tetracalcium Phosphate ◽  
Nanocrystalline Hydroxyapatite ◽  
One Step ◽  
Calcium Sulfate Hemihydrate

A modified one-step process was used to prepare tetracalcium phosphate/monetite/calcium sulfate hemihydrate powder cement mixtures (CAS). The procedure allowed the formation of monetite and calcium sulfate hemihydrate (CSH) in the form of nanoparticles. It was hypothesized that the presence of nanoCSH in small amounts enhances the in vitro bioactivity of CAS cement in relation to osteogenic gene markers in mesenchymal stem cells (MSCs). The CAS powder mixtures with 15 and 5 wt.% CSH were prepared by milling powder tetracalcium phosphate in an ethanolic solution of both orthophosphoric and sulfuric acids. The CAS cements had short setting times (around 5 min). The fast setting of the cement samples after the addition of the liquid component (water solution of NaH2PO4) was due to the partial formation of calcium sulfate dihydrate and hydroxyapatite before soaking in SBF with a small change in the original phase composition in cement powder samples after milling. Nanocrystalline hydroxyapatite biocement was produced by soaking of cement samples after setting in simulated body fluid (SBF). The fast release of calcium ions from CAS5 cement, as well as a small rise in the pH of SBF during soaking, were demonstrated. After soaking in SBF for 7 days, the final product of the cement transformation was nanocrystalline hydroxyapatite. The compressive strength of the cement samples (up to 30 MPa) after soaking in simulated body fluid (SBF) was comparable to that of bone. Real time polymerase chain reaction (RT-PCR) analysis revealed statistically significant higher gene expressions of alkaline phosphatase (ALP), osteonectin (ON) and osteopontin (OP) in cells cultured for 14 days in CAS5 extract compared to CSH-free cement. The addition of a small amount of nanoCSH (5 wt.%) to the tetracalcium phosphate (TTCP)/monetite cement mixture significantly promoted the over expression of osteogenic markers in MSCs. The prepared CAS powder mixture with its enhanced bioactivity can be used for bone defect treatment and has good potential for bone healing.

Surface-Directed Mineralization of Fibrous Collagen Scaffolds in Simulated Body Fluid for Tissue Engineering Applications

2021 ◽  
Vol 4 (3) ◽  
pp. 2514-2522
Author(s):  
Odair Bim-Júnior ◽  
Fabiana Curylofo-Zotti ◽  
Mariana Reis ◽  
Yvette Alania ◽  
Paulo N. Lisboa-Filho ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Collagen Scaffolds ◽  
Engineering Applications
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