PGA Fiber Reinforced Calcium Aluminate Cement for Orthopaedic Application

2016 ◽  
Vol 852 ◽  
pp. 1188-1193
Author(s):  
Yan Ni Tan ◽  
Liu Yong ◽  
Xiang He ◽  
Wen Wang ◽  
Dong Duan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Aluminate ◽  
Fiber Composite ◽  
Calcium Aluminate Cement ◽  
Lower Strength ◽  
Crystalline Phases ◽  
Oxide Hydrate ◽  
In Vitro Biocompatibility ◽  
Aluminate Cement

Calcium aluminate cement (CAC) is a penitential candidate for bone replacements with good bioactivity but relative lower strength. In this study, biodegradable PGA fiber was incorporated into the CAC paste in order to improve the strength of the material. And MC3T3 cells were seeded on the surface of CAC and CAC/fiber to study their in vitro biocompatibility. The results indicate that the PGA fiber can improve the compressive strength of CAC without changing the crystalline phases and micromorphology. Calcium aluminate oxide hydrate, katoite and Gibbsite crystals were detected by XRD. Plate-like crystals can be observed under FESEM. The MC3T3 cells were attached well on both CAC and CAC/fiber composite, indicating their good in vitro biocompatibility. In summary, fiber reinforcement can be an effective way to improve the properties of calcium aluminate cement for orthopaedic application.

Effect of wollastonite and a bioactive glass-ceramic on the in vitro bioactivity and compressive strength of a calcium aluminate cement

2018 ◽  
Vol 44 (16) ◽  
pp. 19077-19083
Author(s):  
G. García-Álvarez ◽  
J.C. Escobedo-Bocardo ◽  
D.A. Cortés-Hernández ◽  
J.M. Almanza-Robles ◽  
B.A. Sánchez-Escobedo
Keyword(s):  
Compressive Strength ◽  
Bioactive Glass ◽  
Calcium Aluminate ◽  
Glass Ceramic ◽  
Calcium Aluminate Cement ◽  
In Vitro Bioactivity ◽  
Aluminate Cement

Influence of Tricalcium Aluminate Phase on In Vitro Biocompatibility and Bioactivity of Calcium Aluminate Bone Cement

2004 ◽  
Vol 19 (4) ◽  
pp. 1062-1067 ◽  
Author(s):  
S.H. Oh ◽  
R. Finones ◽  
S. Jin ◽  
S.Y. Choi ◽  
K.N. Kim
Keyword(s):  
Bone Cement ◽  
Calcium Aluminate ◽  
Setting Time ◽  
Simulated Body Fluid Solution ◽  
Compound Layer ◽  
Calcium Aluminate Cement ◽  
In Vitro Biocompatibility ◽  
Tricalcium Aluminate ◽  
Aluminate Cement

The influence of tricalcium aluminate (3CaO·Al2O3) phase doping on in vitro biocompatibility and bioactivity of calcium aluminate (CaO·Al2O3) based bone cement has been investigated. It is demonstrated that the presence of approximately 25% tricalcium aluminate in the bone cement remarkably improves the bioactivity, yet still retains desirable mechanical strength and biocompatibility. An intermediary compound layer such as Ca3Al2(OH)12 was formed on the surface of the doped sample onto which hydroxyapatite (HAp) began to form soon, after only 2 days of immersion in a simulated body fluid solution. This is about seven-fold acceleration in the HAp formation over undoped calcium aluminate cement on which it took approximately15 days to nucleate the HAp phase. The depth of the HAp-containing layer after60 days of soaking was as much as 85 μm, about an order of magnitude more than the undoped calcium aluminate cement. The dramatically accelerated nucleation and growth of hydroxyapatite caused by the presence of tricalcium aluminate is attributed to the occurrence of intermediate layer materials such as Ca3Al2(OH)12, which most likely acts as the nuclei for HAp formation. This doped bone cement can be useful for injectable orthopedic applications, as the setting time for hardening has also been significantly reduced (by a factor of at least 4) to a practical regime of tens of minutes.

Different Chlorides Attack on the Hydration of Calcium Aluminate Cement at 5~40°C

2021 ◽  
Vol 1036 ◽  
pp. 247-254
Author(s):  
Zhong Ping Wang ◽  
Yu Ting Chen ◽  
Xiang Peng ◽  
Ling Lin Xu
Keyword(s):  
Compressive Strength ◽  
Calcium Aluminate ◽  
Physical Adsorption ◽  
Calcium Aluminate Cement ◽  
Binding Ability ◽  
Cement Pastes ◽  
Thermal Analyzer ◽  
Chloride Attack ◽  
Different Temperatures ◽  
Aluminate Cement

Calcium aluminate cement (CAC) has excellent resistance to seawater erosion, but the mechanism remains to be explored. Effects of NaCl and CaCl2 on the hydration of CAC at 5, 20 and 40°C were investigated in this paper by X-ray diffraction(XRD), thermal analyzer(TG-DSC), scanning electron microscopy(SEM), acoustic and electroacoustic spectrometer. Results show that the varieties of chlorides have great impacts on the chloride binding ability, mechanical properties and microstructure of cement pastes at different temperatures. At 5°C and 20°C, the formation of C2AH8 is suppressed by chloride attack. Though the addition of NaCl promotes the formation of CAH10, CaCl2 leads to a denser microstructure and the improvement in compressive strength. At 40°C, C2AH8 disappears by chloride attack, while C3AH6 and Friedel’s salt increase. Comparing with the attack of CaCl2, NaCl contributes to the formation of C3AH6. Therefore, it results in a the retraction in compressive strength, ascribing to a coarser structure. In addition, although NaCl is superior in chemical binding ability, CaCl2 has better physical adsorption ability which dominants the binding process, and thus leading to greater amount of bonded chloride than that with NaCl. This research provides the oretical basis for the application of CAC in marine environment.

scholarly journals Effects of a novel calcium aluminate cement on the early events of the progression of osteogenic cell cultures

2011 ◽  
Vol 22 (2) ◽  
pp. 99-104 ◽  
Author(s):  
Larissa Moreira Spinola de Castro-Raucci ◽  
Ivone Regina de Oliveira ◽  
Lucas Novaes Teixeira ◽  
Adalberto Luiz Rosa ◽  
Paulo Tambasco de Oliveira ◽  
...  
Keyword(s):  
Cell Cultures ◽  
Calcium Aluminate ◽  
Experimental Studies ◽  
Cell Number ◽  
Calcium Aluminate Cement ◽  
Total Protein Content ◽  
Osteogenic Cell ◽  
Calvarial Bone ◽  
Aluminate Cement

The present study evaluated the progression of osteogenic cell cultures exposed to a novel calcium aluminate cement (CAC+) in comparison with the gold standard mineral trioxide aggregate (MTA). Cells were enzimatically isolated from newborn rat calvarial bone, plated on glass coverslips containing either CAC+ or a control MTA samples in the center, and grown under standard osteogenic conditions. Over the 10-day culture period, roundening of sample edges was clearly noticed only for MTA group. Although both cements supported osteogenic cell adhesion, spreading, and proliferation, CAC+-exposed cultures showed significantly higher values in terms of total cell number at days 3 and 7, and total protein content and alkaline phosphatase activity at day 10. The present in vitro results indicate that the exposure to CAC+ supports a higher differentiation of osteogenic cells compared with the ones exposed to MTA. Further experimental studies should consider CAC+ as a potential alternative to MTA when the repair of mineralized tissues is one of the desired outcomes in endodontic therapy.

Evaluation of strength and set behavior of mortar containing shotcrete set accelerators

2008 ◽  
Vol 35 (4) ◽  
pp. 400-407 ◽  
Author(s):  
Jincheol Kim ◽  
Jonghyun Ryu ◽  
R. D. Hooton
Keyword(s):  
Compressive Strength ◽  
Calcium Aluminate ◽  
Setting Time ◽  
Strength Loss ◽  
Test Methods ◽  
Calcium Aluminate Cement ◽  
Cement Matrix ◽  
Early Age ◽  
Rapid Setting ◽  
Aluminate Cement

The influence of rapid-set accelerating admixtures on the setting behavior and early-age strength of a cement matrix was investigated to evaluate the appropriateness of the specification and test methods for shotcrete set accelerators. The results verified two different rapid setting behaviors according to the types of accelerator. The aluminate-base and the calcium aluminate cement-base accelerators facilitate hydration by formation of a calcium aluminate solid solution, whereas the alkali-free set accelerating agents present rapid setting time by the formation of ettringite. It was also found that the Vicat test was more desirable than the Gillmore test as the standard for setting time evaluation. Additionally, the cement mortar mixed with the aluminate-base and the calcium aluminate cement-base accelerators exhibited very fast development of early-age compressive strength. However, most of the set accelerators, except for alkali-free accelerators, failed to satisfy the specification because of greater than 40% compressive strength loss at 28 d.

Sign in / Sign up

Export Citation Format

Share Document