Rubber Dam Setup

1. Rubber Dam Setup 1 • Name the supplies • A. • B. • C. • D.

2. 2 Stress Strain Curve • Which line represents the more elastic (less stiff) material? • A. upper line • B. Lower line

3. When you pull the bungie the length increases. This change in length is called: A. Stress B. Strain C. Resilience 3

4. 4 The golf balls bounce because of: a. Plastic deformation b. Elastic deformation c. The elastic limit

5. Failure after repeated stress is called: a. stress concentration b. strain c. fatigue d. life sometimes! 5

6. Mechanical Properties 6 • This mouthguard can absorb a lot of energy and is not permanently deformed. This property is called: • A. Toughness • B. Resilience • C. Fracture toughness

7. 7 What do these all have in common? • Jello • Fluoride foam • Alginate • A. They all taste good • B. They are all colloids • C. They all exhibit reversible gelation

8. 8 • This alginate impression has been soaking in water for 24 hours. It probably has undergone: • A. Syneresis • B. Imbibition

9. 9 Classification by Setting • This reaction ( reversible gelation) best describes: • A. Hydrocoloid (Agar) • B. Alginate Sol Gel

10. Polymerization 10 In this reaction there are no byproducts. It might represent: • Condensation reaction • Addition polymerization Monomers Polymers

11. 11 • This alginate impression has been sitting around for 2 weeks! It has undergone: • A. Syneresis • B. Imbibition • C. Hysteresis

12. 12 Trays • Which tray is for hydrocolloid? • Which is a stock tray? • Which is an edentulous tray?

13. This polyvinyl siloxane impression material (PVS) sets via: A. Condensation reaction B. Addition polymerization C. Cationic polymerization 13

14. 14 Which impression material is the most accurate and does not have to be poured immediately? a. The alginate b. The polyvinyl siloxane material

15. 15 This impression material smells like rotten eggs. Which of the following is not true of this material? a. It sets via a condensation reaction b. It requires a custom tray c. It can take up to 15 minutes to set d .It is mainly used for crown and bridge impressions

16. When water is added to the powder in the bowl calcium sulfatehemihydrate changes to calciumsulfate dihydrate, an exothermic reaction. A. T B. F 16

17. 17 What does this Dental Vibrator do for Pouring Impressions? • A. Minimizes distortion • B Helps to eliminates air bubbles • C. Reduces setting time • D. Increases setting time

18. This wonderfully trimmed model has two portions. They are: A. The art portion and the tooth portion B. The art portion and the anatomic portion C. The base and the teeth 18

19. Look at these stone casts. Classify the type of stone labeled as either type II, type III, or type IV. Make your best guess considering the use. A. B. C. 19

20. The high copper amalgam eliminates the weak: A. Gamma phase B. Gamma 1 phase C. Gamma 2 phase 20

21. 21 • The content of these tubes is used to etch enamel and dentin. It is: • A. Polyacrylic acid • B. 2 % phosphoric acid • C. 37% phosphoric acid • D. Jello Remember the smear layer……

22. Composite 22 • Which has more filler? • A. The flowable composite • B. The hybrid • Which has more compressive strength • A. The flowable composite • B. The hybrid composite

23. Which has the higher coefficient of thermal expansion? A. (tooth) B. (composite) 23

24. The composite material has three main components. They include all but one of the following: A. Engineered glass B. Silane coupler C. BIS GMA D. Polyacrylic acid 24

25. 25 The tofflemire and wedge are placed in class II preparations in order to: a. Prevent amalgam “overhangs” b. Create a tight contact between the teeth c. Both a and b

26. Cement Powders 26 • Which powder releases fluoride? • A. Glass Ionomer powder • B. Polycarboxylate powder (Duralon)

27. Cement Liquids 27 • Which cement liquid has a carboxyl group which can chemically bond to the Ca in tooth structure? • a. Flecks (zinc phosphate) liquid • b. Duralon (polycarboxylate) liquid • c. Glass ionomer liquid • d. Both b and c

28. Denture Storage 28 • Which is the best way to store a denture? • A. In the water because the acrylic will absorb water and mimic mouth conditions • B. Dry in order to avoid bacterial growth

29. 29 Which of these partial dentures is a distal extension partial and is usually less stable in the mouth? a. b. c. d. Both b and c

30. 30 • This denture has some brown staining around the teeth (see arrow). The stain is worse in these areas because: • a. The patient held her cigarette next to these teeth • b. The patient chewed tobacco • c. These teeth were replaced with a cold cure acrylic which has greater porosity than heat cure acrylic.

31. What material might go into this tray? A. Hydrogen peroxide bleaching gel B. Carbamide peroxide bleaching gel C. Fluoride desensitizing gel D. All of the above 31

32. Two of these things do not belong together 33 • A. Powdered Latex gloves • B. Polyvinyl siloxane (high viscosity putty type) • C. Impression tray *Note the grey part of the impression was mixed by hand. High viscosity putty material is mixed this way

33. If I want to take an alginate impression of the maxillary arch I should use: a. One scoop of powder b. Two scoops of powder c. Three scoops of powder 34

34. The name of this piece of equipment is: A. Model cutter B. Model trimmer C. Model vibrator 35

35. Cements 36 Which two cements have zinc oxide powder? • IRM and Glass Ionomer • Zinc Phosphate and Duralon • Glass Ionomer and Zinc Phosphate