Bermuda Dental Conference – October 5-7, 2011 Dr Len Boksman – Predictable Crown & Bridge Impression & Simplified Temporization



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Bermuda Dental Conference – October 5-7, 2011
Dr Len Boksman – Predictable Crown & Bridge Impression & Simplified Temporization
1) The only true hydrophilic impression materials are

  1. Reversible Hydrocolloid

  2. Polysulphide

  3. Polyether

  4. Condensation Silicone

  5. Addition Silicone (PVS)




  1. all of the above

  2. none of the above

  3. 1 and 2

  4. 1 and 3

  5. 1,3, and 5

2) Delamination between the heavy body/putty and light body are caused by:



  1. exceeding the working time of the light body

  2. exposure to latex

  3. contamination of the surface of the putty/heavy body

  4. working too quickly

  5. exposure to ozone




  1. all the above

  2. 1 and 5

  3. 1 and 3

  4. 1,2, and 3

  5. None of the above

3) A truly hydrophilic impression material is:

1) dimensionally stable

2) dimensionally unstable

3) unaffected by sterilization

4) unaffected by time

5) unaffected by gypsum products


  1. 1

  2. 1, 3, 4, 5

  3. 5

  4. 4

  5. 2

4) A low contact angle when measured for a polyvinyl siloxane:

1) means the material can be poured up easily by the laboratory

2) means that the material will adapt to a moist tooth more easily

3) means that the material can displace moisture from the tooth

4) means that the material can displace blood

5) means didly squat


  1. 1

  2. 1,2,3,

  3. 1,2,3,4

  4. 5

5) Branched resin chemistry in a third generation polyvinyl siloxane means:

1) 100% cure

2) greater dimensional accuracy

3) higher tear strength

4) increased hydrophilicity

5) increased flow of the material


  1. 1 and 2

  2. 2 and 3

  3. 1 and 4

  4. 4 and 5

  5. 1,2, and 3

6) Working time of impression materials given by manufacturers are typically:

1) at room temperature

2) at oral temperature

3) overestimating the working time in the mouth

4) does not take into account the gelation that occurs from the heat of the mouth

5) adequate for all procedures done in C&B


  1. 1

  2. 1, 3, and 4

  3. 2

  4. 1, and 2

  5. 3 and 5

7) Flavouring when added to PVS materials:

1) hides the bad taste of PVS materials

2) makes the experience more pleasant for the dentist

3) does not affect the impressioning material

4) affects the dimensional stability of the material

5) makes the impression more difficult to take


  1. 1

  2. 2

  3. 1, 3

  4. 5

  5. 3 and 5

8) The shark fin tests measures:

1) the flow of the material

2) the dimensional accuracy of the material

3) the reproduction of detail of the material

4) the flow of the material at mouth temperature

5) the edge strength of the impression material under pressure


  1. 1

  2. 1 and 3

  3. All of the above

  4. None of the above

  5. 1 and 4

9) When a retraction cord is removed with the impression:

1) it is best to leave it alone

2) let the laboratory deal with it

3) the dentist must trim it out

4) is no big deal

5) what is a retraction cord?


  1. 5

  2. 2

  3. 1

  4. 4

  5. 3

10) ALL hemostatic agents must be removed from the preparation before impressioning



a) True

b) False
11) Products that clean the dentinal surface of preparations:

1) all have the same properties

2) Consepsis scrub is the best because it contains chlorhexidine

3) Glycolic acid is best because the surface is cleaner

4) Detail is best because it lowers surface tension

5) The surfactant in impression materials makes the above irrelevant


  1. 1

  2. 2

  3. 3

  4. 4

  5. 1 and 5

12) The dual arch impression technique:

1) can be used for all impressions

2) can be used for bilateral impressions

3) can be used for a terminal abutment

4) can be used in cuspid rise occlusions

5) can be used for group function occlusions


  1. 1

  2. 2, 3

  3. 4

  4. 4 and 5

  5. 5

13) The dual arch impression technique:

1) can be used with all impression materials

2) can be used with most heavy body impression materials

3) can be used with an impression material that has a strain in compression of <2%

4) can be cost effective

5) can be used with a plastic tray


  1. 2, 3, and 4

  2. 1

  3. 4

  4. 3 and 4

  5. None of the above

14) When transferring the final impression during its setting phase to the dental assistant:

1) it is best to have the dental assistant put firm pressure on the tray so it does not move

2) it is best to have the dental assistant put light pressure on the tray

3) the hand off must be passive

4) it is best not to hand over the tray during the setting of the material




  1. 1

  2. 2

  3. 3

  4. 3 and 4

  5. 4

15) A tray adhesive must always be used with PVS materials:

1) not true

2) not necessary if the tray has a mesh to hold in the heavy body

3) not necessary if there are mechanical rim locks to hold the impression in

4) not necessary in Border lock trays

5) should always be used with heavy body PVS materials


  1. 1

  2. 2

  3. 3

  4. 2, and 3

  5. 5

16) Bite registrations when taken with a polyvinyl siloxane:

1) are extremely accurate

2) do not work with alginate driven stone models

3) have a variation in the bounce of the material

4) can be very brittle



5) can cause high occlusion on the final prosthesis


  1. all the above

  2. 1,2,3, and 4

  3. 1 and 5

  4. 1, 3, and 5

  5. 5



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