Hydroxyapatite Coating Analysis

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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

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