Article 1: An Eight-Year Clinical Evaluation of Filled and Unfilled One-Bottle Dental Adhesives 

1. What was the total number of teeth found to have secondary caries at the eight-year follow-up?
Select answer A. six B. four C. two D. none

2. Which one of the following was most prevalent at the eight-year follow-up?
Select answer A. marginal discoloration of retained OptiBond Solo (SDS Kerr, Orange, Calif.) restorations B. marginal discoloration of retained Prime & Bond 2.1 (Dentsply Caulk, Milford, Del.) restorations C. poor marginal adaptation of retained OptiBond Solo restorations D. poor marginal adaptation of retained Prime & Bond 2.1 restorations

3. What was the cumulative eight-year retention rate for OptiBond Solo restorations?
Select answer A. 49.9 percent B. 60.6 percent C. 65.6 percent D. 76.4 percent

4. What was the cumulative eight-year retention rate for Prime & Bond 2.1 restorations?
Select answer A. 49.9 percent B. 60.6 percent C. 65.6 percent D. 76.4 percent

Article 2: The Clinician’s Guide to the Literature: Interpreting Results 

1. What percentage of the observations in a normally distributed sample are expected to fall within a range defined as the mean plus or minus a value that is 1.96 times the standard deviation?
Select answer A. 50 percent B. 67 percent C. 95 percent D. 99 percent

2. Which one of the following is the appropriate interpretation of a difference for which the P value is found to be less than .01?
Select answer A. The difference is statistically significant. B. The difference is somewhat significant. C. The difference is very significant. D. The difference is extremely significant.

3. Which one of the following is the appropriate interpretation of a relative risk calculated to be 1.0?
Select answer A. The risk is greater among exposed subjects. B. The risk is the same for both exposed and nonexposed subjects. C. The risk is greater among subjects who were not exposed. D. There was no risk for subjects who were not exposed.

4. Which one of the following is the appropriate interpretation of the probability represented by a study’s power?
Select answer A. probability of identifying an association if one does exist B. probability of identifying no association if there is not an association C. probability of identifying an association if there is not an association D. probability of identifying no association if one does exist

Article 3: A Comparison of a Refrigerant and a Topical Anesthetic Gel as Preinjection Anesthetics: A Clinical Evaluation 

1. Based on manufacturer’s recommendations, which one of the following patient conditions should preclude use of the refrigerant product tested in this study?
Select answer A. diabetes B. seizure disorders C. hypertension D. dysrhythmia

2. What length of time was allotted for contact between the refrigerant-soaked cotton-tipped applicator and the palatal tissue?
Select answer A. five seconds B. 30 seconds C. one minute D. two minutes

3. What was the mean visual analog scale distance for the refrigerant group?
Select answer A. 12.1 B. 17.7 C. 26.2 D. 32.3

4. What was the mean visual analog scale distance for the topical anesthetic gel group?
Select answer A. 12.1 B. 17.7 C. 26.2 D. 32.3

Article 4: Dissolution of Root Canal Sealers in EDTA and NaOCl Solutions 

1. Which one of the following sealer materials had the greatest mean weight loss, representing the greatest solubility, after two minutes in ethylenediaminetetraacetic acid (EDTA) solution?
Select answer A. calcium hydroxide B. polyketone C. zinc oxide–eugenol D. silicone

2. Which one of the following sealer materials had the greatest mean weight loss, representing the greatest solubility, after 10 minutes in EDTA solution?
Select answer A. calcium hydroxide B. polyketone C. zinc oxide–eugenol D. silicone

3. Which one of the following sealer materials had the greatest mean weight loss, representing the greatest solubility, after two minutes in 2.5 percent sodium hypochlorite (NaOCl) solution?
Select answer A. calcium hydroxide B. polyketone C. zinc oxide–eugenol D. silicone

4. Which one of the following combinations of solvent and time led to the greatest mean weight loss, representing the greatest solubility, for four of the sealer materials (calcium hydroxide, polyketone, zinc oxide–eugenol and silicone)?
Select answer A. EDTA for 10 minutes B. 5.0 percent NaOCl for two minutes C. 2.5 percent NaOCl for two minutes D. 5.0 percent NaOCl for 10 minutes

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