Sample test - Read-only 6. Why biomaterials often need surface modification? Nam

Question

Sample test - Read-only 6. Why biomaterials often need surface modification? Name 3 typical surface modification methods/techniques 7. A biomaterial often need to meet certain mechanical properties depending on medical applications. Name 3 typical mechanical properties of a biomaterial, and explain why each of these properties are important as a medical implants 8. What is ductility and fatigue of a biomaterial? Why are they important or not important? 9. What is biodegradable material? What is their pros and cons compared to non-degradable materials? 10. What is Tg and Tm in terms of thermal properties of biopolymers? What factors will impact them

Explanation / Answer

6. Surface modification is the altering of surface of biomaterial to decrease the complication of biomaterial. Main techniques of surface modifications are plasma surface modification, polymer coating, heparinisation to decrease biocompatibility.

7. Mechanical properties include Tensile and shear strength, bending properties and hydrophillicity and hydrophobicity. These are useful for stability and degree of stress to can be faced by biomaterial.

8. Ductility is property which is important for contouring and shaping of implant. Fatigue of biomaterial is host - tissue response against wear debris from implant. It is defence system of host. Fatigue strength should be high.

9. Biodegradable are those materials which can be decomoposed to its components by the action of microbes. Major benefits of using biodegradable materials is that they are non-pollutant.

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