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Anterior Composite

Presented by Dr. Robert Margeas, DDS

Quiz Results and Correct Answers

1) The most “hydrophilic” PVS impression material when compared to a brand of polyether impression material is:

  1. More than three times as hydrophilic
  2. More than twice as hydrophilic
  3. About the same
  4. Less hydrophilic than a polyether
  5. Considerably less hydrophilic than a polyether

2) "Hydrophilic” when used in regards to a PVS impression material means:

  1. The material “likes” water and is attracted to it
  2. The material “likes” water enough for the dentist to be less concerned about moisture on the prepared tooth during an impression
  3. The material “likes” water enough for the dentist to be less concerned about pouring the impression in gypsum
  4. The material “likes” water enough that it is attracted to the moisture in many disinfectants making it easier to assure disinfection
  5. All of the above

3) When sending an impression to the laboratory to be poured in gypsum, the lab prescription should include the following:

  1. The category of impression material used (i.e., PVS, polyether, hydrocolloid, etc.)
  2. The brand of impression material
  3. Date and time the impression was taken
  4. Information as to whether or not the impression has been disinfected
  5. All of the above

4) Research evidence indicates that the most accurate impressions for a single unit crown can be taken with:

  1. A plastic dual-arch quadrant tray
  2. A metal dual-arch quadrant tray
  3. A plastic quadrant stock tray
  4. An initial impression relined after setting with a wash material, known as the H& H technique

5) Hydrophilicity of an impression material is measured by the contact angle of a liquid to on the surface of the impression material. Which of the following statements is true?:

  1. The greater the contact angle the greater the ability to displace moisture during an impression
  2. The greater the contact angle the smaller the ability to displace moisture during an impression
  3. There is no relationship between contact angle and the ability to displace moisture during an impression

6) When considering the shelf life and expiration date of a dental impression material the important thing to remember is:

  1. All materials gradually degrade over time causing a gradual decline in their reliability
  2. All materials can be used reliably over time until the expiration date
  3. All materials can be used reliably over time long past the expiration date
  4. All materials can be used reliably regardless of storage temperature until the expiration date

7) Retraction cord placed in the sulcus is used primarily to:

  1. Retract the tissue in a more apical direction for visualization during tooth preparation
  2. Retract the tissue in a more apical direction for visualization for the impression
  3. Expand the sulcus in a more lateral direction away from the tooth margin for visualization for tooth preparation
  4. Expand the sulcus in a more lateral direction away from the tooth margin for visualization for the impression
  5. Both A and B
  6. Both C and D

8) When elastomeric impression materials catalyze, they:

  1. Shrink towards a tray when adhesive is used
  2. Shrink towards the center of their mass when no tray is present
  3. Expand away from the tray
  4. Expand away from the center of their mass
  5. Both A and B

9) Refrigeration of elastomeric impression materials in order to increase the working time is an acceptable procedure for an impression involving multiple units:

  1. True
  2. False

10) Which of the following materials do NOT inhibit or alter the setting of PVS impression materials?

  1. Chemicals and powders associated with latex gloves
  2. EDTA
  3. Eugenol
  4. Hemostatic agents

11) Dual arch impressions should be scrutinized before sending to the laboratory to make sure that the impression contains:

  1. No bubbles, pull, streaks, or voids around the preparation
  2. The entire margin of the preparation is visible 360 around the preparation
  3. There is no tooth or tissue contact with the tray
  4. Opposing cuspids are included in the impression to ascertain working movements
  5. All of the above

12) Which impression technique is most likely to cause a reduction of cast size due to elastic recoil associated with hydrostatic pressure during setting?

  1. One-step putty wash
  2. Two-step putty wash
  3. Heavy body tray material with a light body wash
  4. Monophase tray and wash

13) Reproduction of detail is a test performed ADA/ANSI and is a good predictor of three-dimensional accuracy?

  1. True
  2. False

14) When taking either a closed impression for single or multiple implant restoration, the most important predictor of accuracy would be:

  1. Strain-in-compression
  2. Detail reproduction
  3. Elastic recovery
  4. Compatibility of gypsum
  5. Consistency


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