Chapter 11

Question 1

Which statement is true?

a) Bone is strongest is when loaded in compression.
b) Bone is strongest when loaded in tensile force.
c) Bone is strongest when loaded in shear force

Answer 1

a) Bone is strongest is when loaded in compression.

Question 2

Most implant failures are related to :

a) Early implant failure after loading
b) Marginal bone loss before loading but after exposure of the implant
c) Marginal bone loss after loading at the bone-implant interface
d) All of the above
e) a and c

Answer 2

d) All of the above

Question 3

According to Misch, implant body designs should address:

a) Implant surgery
b) Bacterial plaque complications
c) Loading conditions of implants after they are placed in function
d) All of the above
e) a and b

Answer 3

c) Loading conditions of implants after they are placed in function

Question 4

Which statement is true?

a) Bone is stronger when loaded under angled force
b) Axial alignment of implants places less stress on the overall implant system
c) Implant body axis should be perpendicular to the curve of Wilson and Spee
d) All of the above
e) b and c

Answer 4

e) b and c

Question 5

Which statement is true?

a) Stress = force/surface area
b) Functional surface area is the area that actively dissipates forces to implant-bone interface
c) Theoretical surface area on an implant does not participate n load transfer to implant-bone interface
d) To decrease stress to the overall implant system we should increase surface area of the implant.
e) All of the above

Answer 5

e) All of the above

Question 6

Which type of bone is organized, mature and desirable around implants?

a) Composite
b) Woven
c) Lamellar
d) Bundle

Answer 6

c) Lamellar

Question 7

Which microstrain zone is an ideal condition next to an implant?

a) Pathological overload zone
b) Mild overload zone
c) The adapted window
d) Acute disuse window

Answer 7

c) The adapted window

Question 8

Threads are designed to:

a) Maximize initial contact
b) Enhance surface area
c) Facilitate dissipation of loads at the bone-implant interface
d) b and c

Answer 8

d) b and c

Question 9

Which thread feature has the most significant effect on changing the surface area on a threaded implant?

a) Thread pitch
b) Thread shape
c) Thread depth
d) Number of threads leads

Answer 9

a) Thread pitch

Question 10

Which thread shape(s) loads bone with a compressive load transfer?

a) V-shape
b) Buttress
c) Reverse buttress
d) Square
e) b and d

Answer 10

e) b and d

Question 11

Which are desirable characteristics of the crest module?

a) Transfers shear stresses to bone
b) Should be slightly larger than outer thread diameter to seal osteotomy
c) Compresses crestal bone and provides greater initial stability
d) a and c
e) b and c

Answer 11

e) b and c