Dental Materials Ch. 4

Question 1

1. Postage stamps are now self-adhesive. The paper (actual stamp) is referred to as the _____________, and the sticky material on the back of the stamp is termed the _____________.
   (a) Adherend, adhesive
   (b) Adhesive, adherend
   (c) Adhesive, bonding agent
   (d) Adherend, biofilm

Answer 1

(a) Adherend, adhesive

Question 2

2. Kristin has orthodontic appliances, commonly known as “braces.” These include metal brackets directly bonded to the facial surface with a bonding material. One bracket breaks off, and the “failure” occurs within the bonding material. This type of failure is considered to be:
   (a) Adhesive
   (b) Adherend
   (c) Cohesive
   (d) Macromechanical

Answer 2

(c) Cohesive

Question 3

3. On the lines below, use the numbers 1 through 8 to place the steps of the acid-etching process and restoration placement in correct sequence.
   _______ Clean surface is rinsed with water.
   _______ Etched surface is rinsed with water.
   _______ Bonding resin is applied.
   _______ Enamel is cleaned with pumice.
   _______ Cleaned surface is dried with air.
   _______ Etched surface is dried with air.
   _______ Restorative material is applied.
   _______ Etchant is applied.

Answer 3

1. Enamel is cleaned with pumice
2. Clean surface is rinsed with water
3. Cleaned surface is dried with air
4. Etchant is applied
5. Etched surface is rinsed with water
6. Etched surface is dried with air
7. Bonding resin is applied
8. Restorative material is applied

Question 4

4. Orthophosphoric acid (enamel etchant) is commonly used in a _______ concentration.
   (a) 27%
   (b) 30%
   (c) 37%
   (d) 47%
   (e) None of the above

Answer 4

(c) 37%

Question 5

5. Why do primary teeth need to be etched longer than permanent teeth?
   (a) It compensates for potential behavioral management problems
   (b) The enamel is denser on primary teeth
   (c) The enamel rods are more regularly arranged than on permanent teeth
   (d) The enamel rods are less regularly arranged than on permanent teeth

Answer 5

(d) The enamel rods are less regularly arranged than on permanent teeth

Question 6

6. Dentinal bonding systems function by way of:
   (a) Micromechanical bonding and secondary atomic bonds
   (b) Macromechanical bonding and secondary atomic bonds
   (c) Micromechanical bonding and primary atomic bonds
   (d) Macromechanical bonding and primary atomic bonding

Answer 6

(a) Micromechanical bonding and secondary atomic bonds

Question 7

7. The “dentin debris” that is created when dentin is cut or prepared by dental instruments is called:
   (a) Adhesive layer
   (b) Smear layer
   (c) Primer layer
   (d) Chelating agent

Answer 7

(b) Smear layer

Question 8

8. The use of bonding in dentistry serves all of the following functions EXCEPT:
   (a) Reduction of recurrent caries
   (b) Retention of color in the restoration
   (c) Reduction of microleakage
   (d) Retention of restorations

Answer 8

(b) Retention of color in the restoration

Question 9

9. An adhesive mechanism of a dentinal bonding system is a hybrid layer. It is composed of:
   (a) The smear layer and resin
   (b) Dentin primer and decalcified enamel
   (c) Resin and decalcified enamel
   (d) Resin and decalcified dentin

Answer 9

(d) Resin and decalcified dentin

Question 10

10. The following are all historical fallacies about dentinal bonding except one. Which one is the EXCEPTION?
    (a) Composites irritate the pulp
    (b) Dentin should not be etched
    (c) The smear layer is “dentinal debris”
    (d) The smear layer should be left to protect the pulp

Answer 10

(c) The smear layer is “dentinal debris”