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BioMaterials > Biomaterials 3 > Flashcards

Biomaterials 3 Flashcards

1
Q

Which of the following biomedical implant materials will display the highest degree of viscoelastic behavior?
a. CoCrNiMo
b. Hydroxyapatite
c. None of the choices presented
d. 316L SS
e. Zr-Mg-O-YiO2
f. Pyrolytic Carbon

A

None

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2
Q
  1. Which of the following is NOT associated with bone cement?
    a. Shock absorption
    b. Load distribution
    c. Viscoelasticity
    d. Osteointegration
    e. All of the choices
A

All of the above

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3
Q
  1. Methods of creating a viable interface between skin and percutaneous implants include all except:
    a. Use of felts
    b. Allowing implant to “float”
    c. Avoid connected leads when possible
    d. Use of porous materials
    e. Use of velors
    f. Suture the PD and the skin for firm fixation
A

Suture the PD and the skin for firm fixation

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4
Q
  1. When engineering any percutaneous device, end us factors include all except:
    a. Materials Selection
    b. Load
    c. Information transmission
    d. Energy requirements
    e. All of the choices
A

a. Materials Selection

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5
Q
  1. When performing a total hip arthroplasty, fixation may be achieved with or without the use of bone cement?
    a. True
    b. False
A

True

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6
Q
  1. Stress that are associated with cylindrical percutaneous devices include all except:
    a. Torsional stress
    b. Radial stress
    c. Hoop Stress
    d. Bending stress
    e. All of the choices
A

c. Hoop Stress

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7
Q
  1. Which of the following is least likely to occur when bone heals under load?
    a. Osteoclastic response
    b. Increased bone strength
    c. None of the choices presented
    d. Piezoelectric response
    e. All the choices are correct
    f. Osteogenic response
A

a. Osteoclastic response

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8
Q
  1. Methodologies that you would recommend in order to investigate the threat of loosening of hand tissue implants such as knee and hip implants exclude all except?
    a. Electrical Stimulation
    b. Use of porous implant
    c. PMMA bone cement
    d. All choices are correct
    e. Rigorous patient compliance
    f. Ceramic coating
A

a. Electrical Stimulation

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9
Q
  1. Non-self tapping screws are favored due to their superior holding strength?
    a. True
    b. False
A

False

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10
Q
  1. Higher cutting forces are required for screws that have a positive rake angle.
    a. False
    b. True
A

True

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11
Q
  1. Firmness of fixation of screws when used in conjunction with a plate has a positive effect on healing.
    a. True
    b. False
A

True

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12
Q
  1. Three screw designs of different sizes are tested and evaluated for the pullout strength. Buttress, Malleolar, and Cortex it is reasonable to expect differences in their pullout strength.
    a. True
    b. False
A

True

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13
Q
  1. Natural sutures are less likely to elicit an immune response than their synthetic counterparts.
    a. True
    b. False
A

False

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14
Q
  1. Properties of ideal stent design include all except?
    a. None of the Choices
    b. Retrievability
    c. High hoop strength
    d. Thromboresistance
    e. High expansion ratio
A

None

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15
Q

Which of the following is most accurate regarding heart valves?
a. Bi-leaflet valves experience less backflow than tilting disk
b. Caged disks have superior hemodynamics
c. Synthetic tissue valves have an excellent fatigue life
d. None of the choices presented are correct
e. Tissue valves are treated chemically to improve hither mechanical response

A

a. Bi-leaflet valves experience less backflow than tilting disk

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16
Q
  1. Thermal analysis of an unknown sample yields a continuous curve whose function is given by v(T) where v is the specific volume, and T is the temperature. Which of the following statements is true.
    a. Sample may be a ceramic
    b. None of the choices presented
    c. Sample may be a hydrogel
    d. Sample may be a semi-crystalline copolymer
    e. The sample may be glass
    f. Sample may be a composite
A

e. The sample may be glass

17
Q
  1. Results of a WAXD profile that show a broad peak is most indicative of
    a. None of the choices
    b. Super elastic alloy
    c. Ferroelectric
    d. Thermochromic material
    e. Pure metal
    f. 100% crystalline material
A

None

18
Q
  1. Probable causes of loosening include all except
    a. Stress shielding
    b. Blood clots
    c. None of the choices
    d. Shrinkage of bone cement
    e. Osteogenic response during healing
A

e. Osteogenic response during healing

19
Q
  1. Loosening may be classified as mechanical or radiological.
    a. True
    b. False
A

True

20
Q
  1. Improving the wear resistance of UHMWPE that is used in total knee arthroplasty can be achieved by ?
    a. Radiation
    b. Annealing
    c. Lowering the molecular weight
    d. Introducing bulky side groups
    e. None of the choices presented
A

Radiation

21
Q
  1. The use of 316 stainless is preferred over titanium alloys when wires are used as spinal repair devices.
    a. True
    b. False
A

True

22
Q

Nylon implants are immune to degradation when implanted in the body
a. True
b. False

A

False

23
Q
  1. Properties of ideal stent design include all except:
    a. High expansion ratio
    b. Retrievability
    c. Thromboresistance
    d. High hoop strength
    e. None of the choices
A

e. None of the choices

BioMaterials (3 decks)

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