Endodontics & Conservative Dentistry #3

1. Beveling the gingival cavosurface margin of the proximal box of a Class II amalgam preparation on a permanent tooth:

Is unnecessary since the tooth structure in this area is strong

hould remove unsupported enamel that may fracture

Should result in a long bevel

Is contraindicated because of the low edge strength of amalgam

Question 1 of 20

2. A patient reported back with moderate to severe pain 4 weeks after amalgam restoration of a large MOD cavity having deep proximal boxes. The most likely reason for pain is

Food impaction due to faulty proximal contacts

Undetected exposure of a pulp horn

Gingival overhang of the amalgam at the proximal margins

Restoration placed in supraocclusion

Question 2 of 20

3. Abrasive particle size in fine grit diamond point:

38-44 microns

88-125 microns

60-75 microns

76-85 microns

Question 3 of 20

4. Affected dentin differs from infected dentin in that, it has

Been calcified

Not been invaded by microorganisms

Been invaded by microorganisms

A soft leathery texture

Question 4 of 20

5. You have initiated root canal therapy on a patient when he suddenly experiences sudden pain during working length determination, begins to hemorrhage, and detects a burning sensation when you attempt to irrigate with sodium hypochlorite. What is the most likely cause of these symptoms?

Incomplete canal debridement

Root canal contamination

Root perforation

Inadequate straight line access

Question 5 of 20

6. The most effective method of diagnosing the origin of fistula is:

Periodontal probing of all teeth in the area

Visually locating the closest tooth to the fistula

Tracing the fistula with a gutta percha point in conjunction with the radiograph

Percussing all of the teeth in the area of the fistula

Question 6 of 20

7. It has been established that

HIV is less fragile than the hepatitis B virus.

Each patient should be considered potentially infectious.

Exposure to HIV is more likely than exposure to hepatitis B virus.

Transmission of tuberculosis is primarily blood-borne.

Question 7 of 20

8. Which of the following is the most commonly used bleaching agent for endodontically treated teeth:

HCL

CO2 snow

Superoxol

Chloroform

Question 8 of 20

9. Which of the following types and concentrations of fluoride should be recommended for home-care custom tray use by a patient with head and neck cancer

0.4% stannous fluoride and 1.23% acidulated phosphate fluoride

0.4% stannous fluoride and 1 % neutral sodium fluoride

1.23% acidulated phosphate fluoride, 0.4% stannous fluoride, and 1 % neutral sodium fluoride

1.23% acidulated phosphate fluoride and 1 % neutral sodium fluoride

Question 9 of 20

10. What distinguishes a base from a cement from a cavity liner?

Degree of pulpal protection

Degree of hardness

Final application thickness

Biocompatibility of material

Question 10 of 20

11. Phoenix abscess is:

Acute exacerbation of chronic periapical abscess

Chronic periapical abscess

Acute periapical abscess

Chronic exacerbation of acute periapical abscess

Question 11 of 20

12. To avoid external transportation of the root canal

avoid the use of sodium hypochlorite.

precurve instruments.

use vigorous instrumentation.

use large instruments.

Question 12 of 20

13. With regard to the mercury controversy related to the use of amalgam restorations, which statement is incorrect?

True allergies to amalgam rarely have been reported.

Efforts are underway to reduce the environmental mercury to which people are exposed to lessen their total mercury exposure.

There is lack of scientific evidence that amalgam poses health risks to humans except for rare allergic reactions.

Alternative amalgam-like materials (with low or no mercury content) have promise about mercury.

Question 13 of 20

14. Roughest cut surface on a tooth results from

Medium grit diamond at high speed

Medium grit diamond at low speed

Plane fissure bur at high speed

Cross cut fissure bur at high speed

Question 14 of 20

15. Which of the following microorganisms is associated with dental caries

Str.rattus

Str.mitis

Str. Sanguis

Str.salivarius

Question 15 of 20

16. All are true regarding removal of smear layer except:

Principally Contains debris and few microorganisms

Removal of smear layer is essential for successful root canal therapy

Interferes with creation of hermetic seal in root canal

Removal is enhanced by 17% EDTA

Question 16 of 20

17. The setting reaction of dental amalgam proceeds primarily by _____.

Dissolution of the entire alloy particle into mercury

Dissolution of the Cu from the particles into mercury

Precipitation of Sn-Hg crystals

Mercury reaction with Ag on or in the alloy particle

Question 17 of 20

18. A polyp may arise in connection with

chronic periapical lesion

chronic open pulpitis

acute pulpitis

pulp necrosis

Question 18 of 20

19. In the inflammatory process, which of the following cell types function as phagocytes?

Macrophages and lymphocytes.

Neutrophils and macrophages.

Plasma cells and basophils.

Lymphocytes and neutrophils.

Question 19 of 20

20. The shank of a dental hand cutting instrument joints the blade to the

Hand

Handle

Secondary cutting edge

Primary cutting edge

Question 20 of 20