عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
TL53599
انگلیسی
A Mechanism for Selection of Screw-Type Dental Implants for Patients with Low-Density and Osteoporotic Bone
[Thesis]
Khatri K. C., Ram Hari
Moussa, Abdellah Ait
University of Central Oklahoma
2020
90 p.
M.S.
University of Central Oklahoma
2020
Dental implants surgery are one of the most common and an all-time-high demand medical procedure with almost 450,000 dental implants being placed every year with a success rate of 95%. An ideal implant should be biocompatible, withstand compressive loadings and should possess long-life mechanical stability with the surrounding tissues. The initial stability of implant on cortical bone is very strong however life span of implants on trabecular bone is very high almost 95% compared to that of cortical bone. Our goal in this research is to develop a standard for the selection of dental implants for the patients with low density and osteoporotic jaw bone. As a first step a gyroid model was developed which resembles the trabecular tissue. A basic gyroid model equation is supplied with a variable b which is simulated in Wolfram Mathematica to develop gyroids with different volume fraction. Changing the value of b from -1 to 1.35 gave us gyroid network which should be checked for mechanical response. To analyze the mechanical response under compression loading, the generated gyroid was imported into Solidworks then supplied with printing parameters in slicer software for the purpose of 3D printing. Trabecular bone tissue shows bilinear elastic-plastic and dual non-linear and ductile nature. So as a second objective of this research, composites like ABS, glass fiber and LLDPE were homogenously mixed which were bought in pallet form and then the filaments were extruded from the mixed composite. Our goal was to 3D print the gyroid with the filaments made from composite and perform compression test which would give us an acceptable range of modulus of elasticity. To determine the correct proportion of composites 10 samples each of 5%, 6%, 7.5%, 9%, 10%, 12%, 15% and 17% glassfiber reinforced ABS were 3D printed and tested for compression and the young's modulus of 10% and 12% GF ABS was found 1917 MPa and 2125 MPa respectively which is close to several literatures. Then 10 samples of gyroids were printed with 12% GF ABS composition and the average modulus was found to be 1949 MPa with some corrective factor for the loss due to printing temperatures and printing conditions. Development of screw threaded implants couldn't be carried in this research because of limited time and tools and equipment. One important future task can be to find a way to extrude the filaments using LLDPE and 3D print the samples for test. Test samples using LLDPE can easily provide the bilinear elastic-plastic curve under compression test to verify the morphological as well as mechanical properties of trabecular bone.
Biomedical engineering
Dentistry
Mechanical engineering
Khatri K. C., Ram Hari
Moussa, Abdellah Ait
University of Central Oklahoma
مطالعه متن کتاب p
[Thesis]
276903
a
Y
