Article 1: The Evolution of the CEREC System 
W.H. Mörmann

1. Which one of the following was the reason optical scanning was chosen over ultrasound scanning in the early evolution of the CEREC system (Sirona Dental Systems GmbH, Bensheim, Germany)?
Select answer A. risk of soft-tissue damage B. risk of bone tissue damage C. risk of tooth structure damage D. need for shorter wavelengths

2. Which one of the following differentiated CEREC 2 from the earlier CEREC 1 system?
Select answer A. use of feldspathic ceramic blocks became possible B. fabrication of inlays became possible C. fabrication of full crowns became possible D. fabrication of three-unit bridge frameworks became possible

3. Which one of the following used a two-bur system of machining restorations?
Select answer A. basic concept model B. CEREC 1 model C. CEREC 2 model D. CEREC 3 model

4. What range of fitting accuracy was found to be achievable in the early in vitro development of optoelectronic scanning?
Select answer A. 10 to 25 micrometers B. 50 to 100 micrometers C. 125 to 175 micrometers D. 200 to 250 micrometers

Article 2: Materials for Chairside CAD/CAM–Produced Restorations 
R. Giordano

1. Which one of the following block materials for chairside milling is a resin-based composite with zirconia and glass fillers?
Select answer A. Vitablocs Mark II (Vita Zahnfabrik, Bad Säckingen, Germany) B. ProCAD (Ivoclar Vivadent, Schaan, Lichtenstein) blocks C. Paradigm MZ100 (3M ESPE, St. Paul, Minn.) blocks D. Vitablocs TriLuxe (Vita Zahnfabrik)

2. Which one of the following wear ratios would indicate that a material behaved most like natural enamel with respect to abrasion?
Select answer A. 0.62 B. 0.79 C. 0.99 D. 1.34

3. According to a review of multiple clinical trials that was cited in this article, which one of the following had the lowest mean failure rate?
Select answer A. cast gold restorations B. CEREC-generated (Sirona Dental Systems GmbH, Bensheim, Germany) restorations C. direct composite restorations D. amalgam restorations

4. What is the particle size associated with Vita VM 7 (Vita Zahnfabrik) material?
Select answer A. 2 to 5 micrometers B. 20 to 30 micrometers C. 50 to 70 micrometers D. 80 to 100 micrometers

Article 3: Clinical Performance of Chairside CAD/CAM Restorations 
D.J. Fasbinder

1. In a randomized clinical trial of 80 CEREC-generated inlays (Sirona Dental Systems GmbH, Bensheim, Germany), how many restorations resulted in a complaint of sensitivity at one week after placement?
Select answer A. none B. one C. two D. five

2. In a nine-year study of CEREC 1- and CEREC 2-generated restorations, what percentage of failures was attributed to fracture of the restorative material?
Select answer A. 22.9 percent B. 17.1 percent C. 5.7 percent D. 2.3 percent

3. Which one of the following is considered the primary source of increasing color mismatch over time with CEREC-generated restorations?
Select answer A. changes in underlying tooth shade B. changes in mill block shade C. changes in resin-based composite luting agent shade D. changes in surface staining and glazing shade

4. Restoration failure has been found to be primarily due to recurrent caries for each of the following except which one?
Select answer A. amalgam restorations B. direct composite restorations C. glass ionomer restorations D. computer-aided design/computer-aided manufacturing ceramic restorations

Article 4: Making Informed Decisions About Incorporating A CAD/CAM System Into
Dental Practice 
L. Trost, S. Stines, L. Burt

1. What is the typical length of time required for milling of a restoration using the computer-aided design/computer-aided manufacturing (CAD/CAM) system described in this article?
Select answer A. one to two minutes B. four to six minutes C. eight to 10 minutes D. 10 to 12 minutes

2. According to the authors, what is the approximate purchase cost of a CEREC milling unit and acquisition unit (Sirona Dental Systems GmbH, Bensheim, Germany)?
Select answer A. $54,000 B. $78,000 C. $97,000 D. $119,000

3. How many restorations per month did the authors estimate to be the minimum necessary for a clinician to benefit from purchase of a CAD/CAM system?
Select answer A. 17 B. 23 C. 26 D. 29

4. What is the approximate cost per restoration for supplies when a CAD/CAM system is used?
Select answer A. $26 B. $29 C. $34 D. $39

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