Endodontics & Conservative Dentistry #7

1. The Highest concentration of mercury in a polished amalgam restoration, is in the

Equally distributed all around

Marginal areas

Centre of the restoration

Pulpal areas

Question 1 of 20

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

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.

True allergies to amalgam rarely have been reported.

Question 2 of 20

3. During a routine radiographic evaluation, you notice bone loss extending from the cementoenamel junction to the apex of tooth #21. Further evaluation reveals that probing depths are above normal limits all around the tooth. However, at one point, the probe drops precipitously to an even greater depth. Vitality test is negative. This patient may require:

Endodontic treatment only

Endodontic treatment followed by periodontic treatment

Periodontic treatment followed by endodontic treatment

Extensive periodontal treatment followed by vitality reassessmen

Question 3 of 20

4. 50% sulfuric acid is useful for

Degassing of gold foil

Pickling gold alloy castings

Cleaning the prepared tooth surface prior to crown cementation

Acid etching of enamel surfaces

Question 4 of 20

5. The ideal amount of time from placing an indirect pulp cap until reopening the tooth to remove the remaining decay is:

3 - 4 months

1 month

Never, unless the tooth becomes symptomatic there is no need for further treatment

1 year

Question 5 of 20

6. Splinting of cervical root fracture should be done for

4 months

14 days

4 weeks

40 days

Question 6 of 20

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

Chloroform

Superoxol

HCL

CO2 snow

Question 7 of 20

8. A hockey player gets hit with a stick, and his central incisors are intruded. Which of the following is the least useful examination procedure?

Soft tissue exam

Vitality test

Radiograph

Hard tissue exam

Question 8 of 20

9. Irrigant of choice in a tooth with an acute pulpal abscess is

Normal saline

Sodium hypochlorite

EDTA

Hydrogen peroxide

Question 9 of 20

10. After completion of root canal therapy, you recall your patient to evaluate the treatment outcome. What are the criteria for successful root canal therapy?1. Absence of pain 2. Absence of swelling 3. Sinus tract healing 4. No residual probing defects 5. Resolution or healing of periapical lesions

1, 3, 5

2, 3, 4

1, 2, 4, 5

1, 2, 3, 4, 5

Question 10 of 20

11. Which is not a property of sodium hypochlorite (NaOCl)?

Tissue dissolution at higher concentrations

Microbicidal activity

Flotation of debris and lubrication

Chelation

Question 11 of 20

12. Advantage of fiber post over a metal post, all except:

Better esthetics

Modulus of elasticity same as dentin

Bonding to dentine

Technique sensitive and expensive

Question 12 of 20

13. A pin channel perforates the external surface of the tooth, all other factors are favorable, the next logical course of action should be to

Clean the channel and seal it with calcium hydroxide cement

Seal the channel with gold foil and observe the tooth for six weeks before restoring

Line the channel with cavity varnish and cement the pin with inc phosphate cement

Place a pin in the channel provided there is no extension beyond the tooth surface

Question 13 of 20

14. In the first sitting of root canal treatment, in which of the cases should occlusal reduction be done to prevent post appointment pain:

Necrotic pulp; tooth tender to percussion

Irreversible pulpitis; normal periapex

Necrotic pulp; normal periapex

Vital pulp, normal periapex

Question 14 of 20

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

Final application thickness

Biocompatibility of material

Degree of hardness

Degree of pulpal protection

Question 15 of 20

16. ND: YAG laser wavelength

300 um

0.60 um

10.60 um

1.060 um

Question 16 of 20

17. Silver cones are indicated in:

Narrow canal wide till 20 or 25

Young patient with incomplete apex

Calcified canal

Wide straight canal

Question 17 of 20

18. Which of the following best illustrates the reason why calcium hydroxide is not used endodontic procedures involving the primary dentition?

Produces no anti-microbial effect

Can cause external Resorption

Promotes the formation of reparative dentin

Has an alkaline pH

Question 18 of 20

19. When using electrosurgery for management of soft tissue, the deciding factor for the current setting is

Amount of fluid control desired

Health of the patient

Profoundness of anesthesia

Tissue thickness

Question 19 of 20

20. On physical and radiographic examination, your patient presents with DO decay and a gingival swelling at tooth #28. The conical defect on the tooth probes more than 12 mm on the buccal aspect and does not respond to electrical pulp testing. There is no mobility, and this condition is localized to the affected tooth. The periapical radiograph shows destruction of the periodontium from the level of the gingival sulcus to the apex of the tooth. Proper treatment of this condition includes:

Endodontic treatment followed by periodontal treatment

Endodontic treatment only

Periodontal treatment followed by endodontic treatment

eriodontal treatment only

Question 20 of 20