Instructions—Contemporary Oral Hygiene offers 2 Continuing Education (CE) credit hours per issue. To receive credit, record your answers on the enclosed answer sheet or submit them on a separate piece of paper. You may also phone your answers in to (888) 596-4605, or fax them to (703) 404-1801. Be sure to include your name, address, phone number, the last 4 digits of your Social Security number, and method of payment. The deadline for submission of quizzes is 12 months after the date of publication. Participants must attain a score of 70% on each quiz to receive credit. To register, call (888) 596-4605. Participants are urged to contact their state registry boards for special CE requirements.

1. Restorations fabricated within the cavity preparation are categorized as:
   1. direct.
   2. indirect.
   3. Class 1.
   4. Class 2.
       
2. Amalgam, by definition, is an alloy of what with any other metal?
   1. silver
   2. tin
   3. mercury
   4. copper
       
3. What is a slow change in the shape of the amalgam from constant stress?
   1. marginal breakdown
   2. creep
   3. expansion
   4. contraction
       
4. What occurs when 2 dissimilar metals exist in a wet environment?
   1. electrostatic discharge
   2. galvanic corrosion
   3. ion transfer
   4. corrosion in the interior of the restoration
       
5. The first generation composite materials, developed in the 1960s, were categorized as:
   1. microfilled.
   2. macrofilled.
   3. nanofilled.
   4. hybrid.
       
6. Bisphenol-A (BPA) may be produced as the composite matrix slowly degrades in the presence of what commonly found in saliva?
   1. anabolic mucin
   2. catabolic mucin
   3. esterases
   4. anhydrases
       
7. Which are not sensitive to moisture during placement?
   1. composites
   2. glass ionomers
   3. compomers
   4. amalgam
       
8. Compomers combine composite materials with:
   1. fluoride.
   2. glass ionomer.
   3. amalgam.
   4. zinc oxide and eugenol.
       
9. New generation, nanofilled composites:
   1. have detectable margins when explored.
   2. appear dull to the eye.
   3. feel smooth to the explorer.
   4. feel rough to the explorer.
       
10. Composite and glass ionomer restorations require routine polishing:
    1. at the margins.
    2. only when they become stained.
    3. with tin oxide.
    4. with a slurry of pumic.

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