Related Experiment Video
Updated: Jul 9, 2026
The Quantification of Injectability by Mechanical Testing
Published on: May 13, 2020
Injectability evaluation of tricalcium phosphate bone cement.
Hugo Leonardo Rocha Alves1, Luis A Dos Santos, Carlos P Bergmann
1Department of Materials Science and Engineering, Federal University of Rio Grande do Sul, Avenida Osvaldo Aranha, 99, 705c, Centro, Porto Alegre, RS 90620-000, Brazil.
This study investigated how to make injectable bone cement from tricalcium phosphate. Researchers added different substances to the cement to improve its flow. They tested carboxymethylcellulose, agar polymer, and sodium alginate at various concentrations. A new method was developed to evaluate how well the cement could be injected. Results showed that some additives helped the cement flow better. Carboxymethylcellulose and sodium alginate were most effective. Agar polymer did not consistently improve injectability. The study found that viscosity and injection time are important factors. These findings could help develop better injectable bone cements for surgery.
Area of Science:
- Biomaterials engineering
- Orthopedic surgery materials
- Dental implantology
Background:
Injectable bone cements are essential in modern surgical practices. Traditional calcium phosphate cements require invasive placement techniques. These materials harden through precipitation reactions at body temperature. Their use is widespread in orthopedics and dentistry. However, injectability remains a significant challenge. Additives are often used to modify paste properties. Prior research has shown that rheology affects injectability. This gap motivated the development of new injectable formulations.
Purpose Of The Study:
The aim of this study was to evaluate injectability of tricalcium phosphate cement. Researchers focused on the role of additives in paste formulation. They tested three different polymers at varying concentrations. The goal was to identify suitable injectable compositions. The study aimed to assess the impact of rheological behavior. Injection time was considered a key variable. The researchers developed a new testing method for this purpose. Their work sought to improve clinical application of these cements.
Main Methods:
The study used tricalcium phosphate as the base material. Three additives were selected for testing: carboxymethylcellulose, agar polymer, and sodium alginate. Each was tested at five weight percentages: 0.4, 0.8, 1.6, 3.2, and 6.4 wt.%. A new injectability evaluation method was developed. The method assessed paste flow and homogenization. Rheological properties were measured under controlled conditions. Injection time was recorded for each formulation. The results were compared to determine optimal concentrations.
Main Results:
Injectable compositions of alpha-tricalcium phosphate cement were achieved. The best results occurred with specific additive concentrations. Carboxymethylcellulose at 3.2 wt.% showed favorable properties. Sodium alginate at 1.6 wt.% also improved injectability. Agar polymer had limited effectiveness at all tested levels. Viscosity was found to correlate with injection success. Homogenization was easier at lower viscosity levels. The study confirmed that additive type and concentration matter.
Conclusions:
The study demonstrated that injectable tricalcium phosphate cements are feasible. Additive selection and concentration are critical factors. The developed method effectively evaluated injectability. Viscosity and injection time were key variables. The findings suggest that suitable formulations can be achieved. Carboxymethylcellulose and sodium alginate were most effective. Agar polymer did not consistently enhance injectability. These results may guide future material development.
Frequently Asked Questions
The study showed that injectable alpha-tricalcium phosphate cements can be formulated using specific additives.
Carboxymethylcellulose, agar polymer, and sodium alginate were tested at different concentrations.
Viscosity affects how easily the cement paste flows and homogenizes during injection.
The method assessed how well the cement paste could be injected under controlled conditions.
Carboxymethylcellulose at 3.2 wt.% and sodium alginate at 1.6 wt.% improved injectability most.
The authors found that agar polymer did not consistently enhance injectability at tested levels.
