Hydroxyapatite (HA) coating is commonly used in orthopedic and dentistry arenas. Its wide clinical application has ground in its biocompatibility, bioactivity, and structural resemblance to native part of teeth, and body bone. On the contrary to the widespread use of implant coating, this method confronts with some defects among which the low bounding strength, and sudden change in mechanical properties after using bioceramic coating on biometalic substrate are more important than others. Nowadays, functionally graded biomaterials (FGBM) are literally used in dental implants. These compound complex biomaterials are able to satisfy the requirements of both mechanical properties, and biocompatibility conditions simultaneously. In this regard, …show more content…
Since this material has a good biocompatibility with tissues forming human body, it is widely used as the coating material of dental implant and prostheses. HA is an osteophilic material which does not absorb and also is not solved in the body solutions. Furthermore, it stimulates the natural bone production such that bony structures fill the spaces around the implant and makes a good bond with bones in a direct connection. The physical and mechanical properties of HA vary according to different conditions and synthesis methods. Many studies have been performed to improve the properties of HA such as assessing the effects of sintering and annealing processes on HA properties [19, …show more content…
The thread profile is selected V-3 trapezoid type which has exhibited appropriate stress distribution in previous studies [3]. Modeling of human mandible including the cancellous core surrounded by the cortical layer with the width of 1.5 to 2 mm is simulated based on CT scan inputs. The ABAQUS 6.10 software (SIMULIA Corporation, Providence, RI, USA) were used to obtain the bone stress distribution. In order to define the contact between the implant and bone, it is assumed that osseointegration existed completely and the simulation contact is considered to be perfectly bonded. A concentrated force is applied on the center of abutment’s top surface. The model was fixed in all directions at the bottom surface of mandible bone while displacements of all nodes across each lateral side were constrained in perpendicular direction. Figure 1 shows the details of simulation
Chapter six welcomes us into the skeletal system by presenting functions,types,structure, and development of bones. We are also presented the ideas of fractures and even the spine- curling snap of a broken bone which means a band aid simply won 't do! For example, Hematoma formation , Fibrocartilaginous callus, Bony callus ,and Remolding must occur to heal ,aka 3-10 weeks in a signature infested cast ,and if the break eventuated* on your arm, a complementary farmer 's tan. The Axial Skeleton makes an appearance by explaining itself as lying in the middle of the body and consisting of the skull, hyoid bone, vertebral column, thoracic cage, and middle ear bones. The complexity, physiology and delicate fashions of each member of this group is expressed.
The chin or mandibular symphysis can be analyzed by looking at the profile of the mandibule. The shape of dental arcade can be determined by looking at the skull from a ventral view and analyzing the shape that the upper teeth generate. The dentition can be determined by analyzing the size of the overall teeth with the size of the overall facial size. Finally, the retromolar space can be identified by evaluating the space between the last molar and the rest of the
The objective of the virtual lab on bones consisted of identifying the major bones of the human body. We had to place the major bones of the body in the correct anatomical position. The key terms included the axial skeleton which includes the skull and the bones that support it, such as, the vertebral column, ribs, and sternum. The appendicular skeleton includes the bones of the limbs and the structures that support them such as, the scapula and pelvic bones.
The corkscrew end of the implant fitted into the thigh bone, while the other end which fitted into the shin bone had three projections which would prevent
Janmar Coatings, Inc. In-Depth Case Analysis Prepared by: Elliot Thome In partial fulfillment of the requirements of Marketing Management and Policies Submitted February 26th, 2015 Case Synopsis In early January 2005, Ronald Burns, president of Janmar Coatings, Inc., and his senior management executives were faced with the issue of deciding where and how to deploy corporate marketing efforts among the various markets served by the company.
However, each of these methods come with some advantages and some disadvantages that are discussed in this paragraph. X-ray, one of the commonly used method can be used only in a static manner to analyze residual femoral movement within transfemoral sockets and also residual tibial movement within transtibial sockets. The contact between the residual limb and prosthetic socket can also be studied using X-ray imaging. However, X-ray images cannot be used for volumetric and three dimensional\thinspace(3D) measurements. Using CT, the 3D shape of the residual limb can be reconstructed from a number of two dimensional\thinspace(2D) slices that are taken transversely to the limb's long axis.
The hypothesis of this study were that 1) anterior cortical osteotomy would be larger in the uni-planar osteotomy, 2) gap ratio would be larger in the bi-planar osteotomy, and 3) maintenance of the slope would be closely related to the length of posterior cortical osteotomy.
adequate exposure , the junction of normal bone and pathological tumor was identified followed by thorough surgical curettage of the lesion. The lower border of mandible was intact and utmost care was taken to prevent pathological
The low antigenicity, biodegradable nature, and cell-binding properties of collagen make it valuable for tissue engineering applications. In parallel, Gelatin is biocompatible, non-immunogenic and bioresorbable. Although, gelatin lacks the structural characteristics of collagen but it has higher solubility and lower cost relative to collagen. Gelatin/CaPs nanocomposites with enhanced mechanical properties and better cell attachment have also been reported. The gelatin/HAP nanostructured scaffolds exhibited mechanical strength comparable to the spongy bone with an excellent capacity of cell attachment, migration and penetration into the pores of the nanocomposite.
In this process first the 3D printer creates a “scaffold” in the exact shape of the patients bone (Lewis, 2013). The scaffold can be made out of hydroxyapatite or porous ceramic material, as they both have shown biocompatibility for tissue generation (Irsen, et al, 2005). Next, the scaffold is coated with stem cells that will develop into fully functional bone tissue (Lewis, 2013). The stem cell covered scaffold is then placed into the body and after about three months the scaffold degenerates and is replaced by new bone tissue (Lewis, 2013). Like the previous process, this process also is both time and cost effective (Lewis,
INTRODUCTION Bone is a living, complex, hard tissue that constitutes the vertebral skeleton. It is a composite comprising of well-defined structures at different scales of hierarchy. It has an organic matrix phase composed primarily of collagen, with the inorganic phase embedded in it. The calcium and phosphate containing inorganic crystals ultimately form hydroxyapatite. The bone morphology can be describes as comprising of the cortical bone - the outer compact region, and the trabecular bone - the inner spongy region.
Bone is a complex, highly organized and specialized connective tissue. It is characterized physically by the fact that it is a tissue that is hard, rigid and strong, and microscopically by the presence of relatively few cells and much intercellular substance formed of collagen fibers and stiffening substances [1,2]. Bone consists of 65% mineral, 35% organic matrix, cells, and water. The bone mineral is in the form of small crystals in the shape of needles, plates, and rods located within and between collagen fibers.
About, bone tissue engineering Biological properties and mechanical properties is very important. On the other hand, for mimicking natural bone, as possible, composition and structure are similar.