An injectable bone graft substitute to enhance the primary stability of a novel miniscrew – The Sydney Mini Screw
Published Online: Jul 20, 2021
Page range: 179 - 187
Received: Oct 01, 2017
Accepted: Feb 01, 2018
DOI: https://doi.org/10.21307/aoj-2020-069
© 2018 Anastasia Bakopoulou et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Introduction
Anchorage is crucial in controlling tooth movement during orthodontic treatment. Different designs have been introduced to increase the stability of miniscrews. A new miniscrew, The Sydney Mini Screw (SMS), with a hollow chamber and lateral port holes, has been developed to allow the diffusion of an injectable bone graft substitute (iBGS) into cancellous bone. The aim of this study was to analyse the optimum iBGS application with ideal chemo-mechanical properties to be used in conjunction with the novel SMS.
Method
A composite calcium sulphate and calcium phosphate bone graft substitute was examined. The effects of powder particle size, and the powder-to-liquid ratio on the injectability of the iBGS through the SMS were investigated. The viscosity, injectability, and mechanical properties of the new composite mixtures were assessed using rheology and universal compression measurements.
Results
The results showed that the optimised injectable formulation of the bone cement was acquired with the concentration of 2.5 g/ml. This concentration was readily injectable through the SMS, and its setting time was within 2–3 minutes, which is favourable for clinicians. In addition, the resulting structure fractured at 80 kPa compression stress.
Conclusion
The result of this study identified the specific particle size and powder-to-liquid ratio of the iBGS that can be used in conjunction with the new SMS to enhance the primary stability of orthodontic miniscrew applications.