Test. Dental Restorative Materials (CHOOSE ONE ANSWER)
1. Dental restorative materials should meet the following equirements:
a) to provide hermetic closure of cavity;
b) to have high wear resistance;
c) to match the natural tooth color;
d) good handling properties;
e) all variants are correct.
2. There are two types of materials for isolation linings:
a) thin lining;
b) base lining;
c) dentin-enamel lining;
d) esthetic lining;
e) a and b;
f) c and d;
g) a, b and c.
3. Which materials we can use for isolation cavity linings:
a) composites;
b) zinc phospate cement;
c) zinc eugenol cement;
d) glass ionomer cement;
e) c and d;
f) a and b;
g) b and d.
4. The peak of photopolymerization lamp wavelength is:
a) around 460 nm;
b) around 360 nm;
c) 546 nm;
d) 366 nm.
5. Photopolymerization shrinkage of self-curing composites is directed towards:
a) outside;
b) lateral walls;
c) center.
6. Light intensity is higher and the time of exposition is shorter in the following polymerization lamp:
a) LED lamp;
b) halogen lamp.
7. Etching of enamel is carried out for:
a) 15 seconds;
b) 5 seconds;
c) 20 seconds;
d) 1 minute.
8. Concentration of orthophosphoric acid for etching is:
a) 20%;
b) 37%;
c) 15%;
d) 3%.
9. Photopolymerization initiator in light-cured composites is:
a) tertiary amine;
b) camphoroquinone;
c) hydroquinone;
d) UEDMA.
10. Liquid component in polycarboxylate cement is:
a) phosphoric acid;
b) polyacrylic acid;
c) polymaleinic acid;
d) hydrogen peroxide.
11. What are the advantages of glass ionomer cements:
a) satisfactory esthetic properties;
b) high biocompatibility;
c) easy to use;
d) relative cheapness;
e) all variants are correct.
12. What is the main component of glass ionomer powder:
a) fluorapatite;