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Enhanced osseointegration of drug eluting nanotubular dental implants: An in vitro and in vivo study

Bioactive Materials 2023年第10期28卷 432-447页

作者： Pankaj Chauhan Alok Srivastava Pooja Bhati Manish Chaturvedi vinay patil Sriram Kunnoth Nisha Kumari Vedpal Arya Madhur Pandya Mohit Agarwal Smiti Bhardwaj Farrukh Faraz Sanjay Chauhan Mahesh Verma Veena Koul Naresh Bhatnagar Homi Bhabha Cancer Hospital and Research Centre VizagAndhra PradeshIndia Centre for Biomedical Engineering Indian Institute of Technology DelhiIndia Department of Mechanical Engineering Indian Institute of Technology DelhiIndia Mechanical&Automation Engineering Indira Gandhi Delhi Technical University for WomenNew DelhiIndia Rajasthan Technical University Kota RajasthanIndia Applied Mechanics Indian Institute of Technology DelhiIndia National University of Singapore Singapore Department of Periodontics Maulana Azad Institute of Dental SciencesNew DelhiIndia Rajasthan Dental College and Hospital JaipurRajasthanIndia Department of Prosthodontics Maulana Azad Institute of Dental SciencesNew DelhiIndia

Faster and predictable osseointegration is crucial for the success of dental implants, especially in patients with compromised local or systemic conditions. Despite various surface modifications on the commercially available Titanium (Ti) dental implants, the bioactivity of Ti is still low. Thus, to achieve both biological and therapeutic activity on titanium surfaces, surface modification techniques such as titanium nanotubes have been studied as nanotube surfaces can hold therapeutic drugs and molecules. The main aim of the present research work is to study the early osseointegration around the novel Simvastatin drug eluting nanotubular dental implant. In the present research, the titanium nanotubes were fabricated on the screw-shaped dental implant surface and the Simvastatin drug was loaded into the nanotubes using the ultrasonication dip method. In vitro and In vivo studies were carried out on the modified dental implants. In vitro cell culture study reported enhanced osteogenic activity on the drug-loaded nanotube surface implants. The in vivo animal studies were evaluated by micro-CT, histopathology, and reverse torque removal analysis methods. The test results showed faster osseointegration with the strong interface on the Simvastatin drug-loaded implant surface at 4 weeks of healing as compared to the control implants.

关键词： Titanium Biocompatibility Simvastatin Nanotube Micro CT Histopathology Nanoscale

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Integrated “Generate, Make, and Test” for Formulated Products using Knowledge Graphs

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Data Intelligence 2021年第3期3卷 340-375页

作者： Sagar Sunkle Deepak Jain Krati Saxena Ashwini patil Tushita Singh Beena Rai vinay Kulkarni Tata Consultancy Services Research Pune MaharashtraIndia411013

In the multi-billion dollar formulated product industry, state of the art continues to rely heavily on experts during the "generate, make and test" steps of formulation design. We propose automation aids to each step with a knowledge graph of relevant information as the central artifact. The generate step usually focuses on coming up with new recipes for intended formulation. We propose to aid the experts who generally carry out this step manually by providing a recommendation system and a templating system on top of the knowledge graph. Using the former, the expert can create a recipe from scratch using historical formulations and related data. With the latter, the expert starts with a recipe template created by our system and substitutes the requisite constituents to form a recipe. In the current state of practice, the three steps mentioned above operate in a fragmented manner wherein observations from one step do not aid other steps in a streamlined manner. Instead of manually operated labs for the make and test steps, we assume automated or robotic labs and in-silico testing, respectively. Using two formulations, namely face cream and an exterior coating, we show how the knowledge graph may help integrate and streamline the communication between the generate, the make, and the test steps. Our initial exploration shows considerable promise.

关键词： Formulated product design Formulation recommendation Formulation template Robotic labs In-silico testing Integrated generate-make-test

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Microwave/Thermal Analyses for Human Bone Characterization

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Journal of Biomedical Science and Engineering 2016年第2期9卷 101-111页

作者： vinay Kumar Suryadevara Suyog patil James Rizkalla Ahdy Helmy Paul Salama Maher Rizkalla Department of Electrical and Computer Engineering Indiana University-Purdue University Indianapolis Indianapolis USA Indiana University School of Medicine Indianapolis USA Integrated Nanosystems Development Institute (INDI) Indiana University-Purdue University Indianapolis Indianapolis USA

A novel imaging approach utilizing microwave scattering was proposed in order to analyze various properties of bone. Microwave frequencies of 900 MHz, 1 GHz, and 2.4 GHz were used during this study. This investigation’s objectives were to emphasize characteristics of abnormalities in human bones and to detect fine fractures through contrasts in bone density. The finite element method (FEM) presented here is generated from COMSOL software at different frequencies. The study identified the optimum transmission directed at the interface layers from an external microwave source. It was found that approximately 900 MHz microwave power was ideal for this application. This can be attributed to the penetration depth where the power dissipation is analyzed based on bone condition. The microwave energy was generated from an exterior antenna that was interfaced, via catheter, to skeletal bone. The power transmitted to bone was converted into thermal energy, and has led to a visible temperature distribution pattern, which reflects the bone density level, and accordingly, the type of bone under investigation. The electrical and thermal properties, including the dielectric permittivity, thermal conductivity, and heat flux absorption through the bone substance, have great implications on the FEM distribution. The boundary conditions using tangential matching of field components at the tissue-bone interface were incorporated into the finite element method. The average power from the electromagnetic fields (estimated from the Poynting’s vector, P = E*H), was assumed to be fully absorbed as heat due to the conductivity of the bone material. Furthermore, microwave energy was applied as a delta function and the thermal distributions have been analyzed in order to distinguish between normal healthy bone and bones with structural or metabolic abnormalities. The latter was emulated by different bone density to contrast normal bone anatomy. The FEM simulation suggests that thermography mic

关键词： Microwave Human Bones Simulation FEM COMSOL Thermal Diagnosis

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