Papers by Author: Yun Feng Liu

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Authors: Yun Feng Liu, Xing Tao Dong, Fu Dong Zhu
Abstract: The scaffolds of bone tissue engineering (BTE) are designed with complex interconnected pores for providing mechanical support, cell attachment and nutrition delivery, and can be directly fabricated via rapid prototyping (RP). Based on reviews on amount of papers, fundamental of BTE, including research procedure and biomaterials for scaffold are presented. And various RP methods for scaffold fabrication, including selective laser sintering (SLS), fused deposition modeling (FDM), 3 dimension printing (3DP), are introduced. The conclusions including existing problems and future researches about BTE scaffold fabrication are given at the end.
Authors: Yun Feng Liu, Gen Zhou, Sean Shih Yao Liu
Abstract: The forces and moments supplied by braces determine the movement of tooth in orthodontic treatment, so clearly quantifying the force value is very important to formulate precise treatment plan. In recent decades, scholars have presented many articles about biomechanical research on orthodontic force. Based on investigations of these papers, techniques on orthodontic force stimulation including oral model (bone, PDL and teeth included) reconstruction and constitute model construction, methods in orthodontic force measurement including physical oral model fabrication and device architectures, and techniques on orthodontic force control such as the use of shape memory alloy and shape memory polymer as the wire material, are reviewed. At the end, the conclusions and future works are given.
Authors: Yun Feng Liu, Xing Tao Dong, Hui Yong Zhu, Wei Peng
Abstract: Conventional methods for diagnosis and operation planning based on 2D image are still widely used in oral and maxillofacial prostheses surgery, and the accuracy and efficiency are needed to improve eagerly. Aiming at this problem, rapid prototyping (RP), a technique of advanced manufacturing, is applied to fabricate the physical model of bone, and which is used to simulate the operation further. The procedure of RP based precise surgery is presented, and some key techniques including CT image processing, 3D bone model reconstruction, repairing model design, physical model fabrication, pre-operation simulation are discussed in detail. Total 25 successful clinical applications illustrate that, with RP based precise surgery methodology, the efficiency and quality of oral and maxillofacial prostheses can be improved effectively.
Authors: Yun Feng Liu, X.H. Shao, X.T. Dong, Wei Peng
Abstract: Advanced engineering techniques have been used in medical area wildly, but experience of surgeon is still relied heavily in dental implant in China. Aiming at this problem, a methodology of minimally invasive dental implant based on techniques of digital design and manufacturing is proposed, the procedure and some key problems of design and manufacturing are studied deeply. With designed implant plan based on 3D computer model reconstructed from CT images of oral and point cloud of oral plaster model, a surgical guide on the mucosa and teeth surface can be designed and fabricated. In clinical operation, the surgical guide is fixed on oral inner surface directly to guarantee the implant plan implemented accurately. Contrast to traditional dental implant, the minimally invasive surgery can be realized without soft tissue flap, and the temporary denture can be fabricated and fixed in the oral to recover the tooth function immediately. Clinical applications illustrate that, with proposed methodology, the efficiency and quality of implant operation can be improved effectively.
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