Article 1: Caries Risk in Formerly Sealed Teeth 

1. What is the estimated prevalence of dental sealants among youths in the United States?
Select answer A. 20 percent B. 30 percent C. 40 percent D. 50 percent

2. In a study of retention at the site level, by pit and fissure rather than by tooth, what percentage of formerly sealed sites was accounted for by partially lost sealants after one year?
Select answer A. 14 percent B. 27 percent C. 39 percent D. 44 percent

3. What was the weighted mean relative risk (RR) of caries after one year across four studies for formerly sealed teeth compared with never-sealed teeth?
Select answer A. 1.729 B. 1.214 C. 0.998 D. 0.717

4. What was the weighted mean RR of caries after four years across five studies for formerly sealed teeth compared with never-sealed teeth?
Select answer A. 1.671 B. 1.198 C. 0.936 D. 0.785

Article 2: Sealing, Refurbishment and Repair of Class I and CLASS II Defective Restorations: A Three-Year Clinical Trial 

1. For restorations in group A (sealed margins), what percentage were rated Alfa for marginal adaptation after three years?
Select answer A. 43 percent B. 60 percent C. 80 percent D. 96 percent

2. For restorations in group B (refurbishment), what percentage were rated Alfa for surface roughness after three years?
Select answer A. 50 percent B. 66 percent C. 70 percent D. 85 percent

3. For restorations in group C (repair), what percentage were rated Alfa for anatomical form after three years?
Select answer A. 43 percent B. 58 percent C. 74 percent D. 81 percent

4. For restorations in group D (replacement), what percentage were rated Alfa for marginal adaptation after three years?
Select answer A. 43 percent B. 60 percent C. 80 percent D. 96 percent

Article 3: Clinical Evaluation of Two Packable Posterior Composites: A Five-Year Follow-up 

1. Five years after placement, how many of the restorations failed owing to secondary caries?
Select answer A. one B. two C. four D. six

2. After five years, how many of the restorations were scored lower than Alfa for sensitivity?
Select answer A. one B. two C. four D. six

3. After five years, how many of the restorations were scored lower than Alfa for retention?
Select answer A. two B. four C. six D. eight

4. After five years, how many of the restorations were scored lower than Alfa for surface texture?
Select answer A. 17 B. 21 C. 25 D. 29

Article 4: The Effect of Casein Phosphopeptide-Amorphous Calcium Phosphate and a Cola Soft Drink on In Vitro Enamel Hardness 

1. In the demineralization phase, how long was each sample immersed in the cola soft drink before being immersed in artificial saliva?
Select answer A. one second B. five seconds C. 30 seconds D. 60 seconds

2. What was the mean percentage reduction in microhardness among all of the samples after erosion with the cola soft drink?
Select answer A. 3.90 percent B. 8.70 percent C. 11.20 percent D. 14.30 percent

3. Which group had the largest percentage increase in microhardness after the remineralization phase of the study?
Select answer A. Group 1 B. Group 2 C. Group 3 D. Group 4

4. Which group had a decrease in microhardness after the remineralization phase of the study?
Select answer A. Group 1 B. Group 2 C. Group 3 D. Group 4

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