Article 1: A Randomized Trial of Resin-Based Restorations in Class I and Class II Beveled Preparations in Primary Molars: 24-Month Results 

1. How many Class I restorations failed during this study?
Select answer A. seven B. 10 C. 13 D. 16

2. Which one of the following was the most frequently observed reason for failure among the beveled Class I restorations in this study?
Select answer A. marginal adaptation B. anatomical form C. marginal staining D. secondary caries

3. How many Class II restorations failed during this study?
Select answer A. seven B. 10 C. 13 D. 16

4. Which one of the following was the least frequently observed reason for failure among the beveled Class II restorations in this study?
Select answer A. marginal adaptation B. anatomical form C. marginal staining D. secondary caries

Article 2: Atrial Fibrillation: Pathogenesis, Medical-Surgical Management and Dental Implications  

1. Where does the depolarization begin for a nerve impulse generating a heartbeat?
Select answer A. sinoatrial node B. internodal fibers C. atrioventricular node D. Purkinje fibers

2. By what percentage is “atrial kick” typically reduced by atrial fibrillation?
Select answer A. 5 to 10 percent B. 10 to 20 percent C. 20 to 30 percent D. 30 to 40 percent

3. What is the target international normalized ratio (INR) value used as a goal in anticoagulant therapy?
Select answer A. 2.0 B. 2.5 C. 3.0 D. 3.5

4. Each of the following medications is likely to interact with warfarin regimens to reduce a patient’s INR except which one?
Select answer A. nafcillin B. dicloxacillin C. chloral hydrate D. amoxicillin

Article 3: Evaluation of Two Nitrous Oxide Scavenging Systems Using Infrared Thermography to Visualize and Control Emissions 

1. What was the mean air concentration level of nitrous oxide (N2O) during surgeries in phase I?
Select answer A. 24.9 parts per million B. 61.6 ppm C. 166.5 ppm D. 225.6 ppm

2. What was the mean air concentration level of N2O during surgeries in phase II?
Select answer A. 24.9 ppm B. 61.6 ppm C. 166.5 ppm D. 225.6 ppm

3. Which one of the following statements correctly states the results of statistical comparisons of N2O concentration levels among the study phases?
Select answer A. Phase I and phase III had significantly lower concentration levels than did phase II. B. Phase I and phase II had significantly lower concentration levels than did phase III. C. Phase II and phase III had significantly higher concentration levels than did phase I. D. The air concentration levels for phase I, phase II and phase III did not differ significantly.

4. Which one of the following key work practices was followed during both Phase I and Phase III of the study?
Select answer A. ensuring that proper mask size is selected B. tightening straps of mask so that it is snugly placed against patient face C. turning on vacuum exhaust before beginning nitrous oxide administration D. discouraging patient from talking and mouth breathing

Article 4: An Evaluation of Replacement Rates for Posterior Resin-Based Composite and Amalgam Restorations in U.S. Navy and Marine Corps Recruits 

1. According to another study, what percentage of dental restorations placed during 2005 in the United States were estimated to be amalgam?
Select answer A. 31.6 percent B. 45.9 percent C. 55.3 percent D. 59.1 percent

2. Which one of the following had the highest percentage of restorations needing replacement for all reasons combined?
Select answer A. one-surface resin-based composite B. one-surface amalgam C. multisurface resin-based composite D. multisurface amalgam

3. Which one of the following had the lowest percentage of restorations needing replacement for all reasons combined?
Select answer A. one-surface resin-based composite B. one-surface amalgam C. multisurface resin-based composite D. multisurface amalgam

4. What was the adjusted hazard ratio for replacement (resulting from all causes) of resin-based composite restorations compared with amalgam restorations?
Select answer A. 1.28 B. 1.51 C. 1.83 D. 2.14

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