Endodontics & Conservative Dentistry #6

1. The reason to invert a rubber dam is _____.

All of above

To prevent the dam from tearing

To provide a complete seal around the teeth

To prevent the underlying gingival from accidental trauma

Question 1 of 20

2. In which of the following scenarios would you consider using solvent softened custom cones

After an apexification procedure

All of the above

An irregular apical portion of the canal

An abnormally large apical portion of the canal

Question 2 of 20

3. Which cavities can involve only posterior teeth

class I

class V

class II

class VI

Question 3 of 20

4. Which of the following may be used to fill the pathologic void of a non perforating internal resorption:

Zinc oxide eugenol

Silver Amalgam

All of the above

Gutta percha

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:

1 month

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

3 - 4 months

1 year

Question 5 of 20

6. Prior to reimplantation, tooth s soaked in 3% citric acid. This is done to:

Increase surface reactivity

Remove the PDL

Disinfect the tooth

Etch the surface

Question 6 of 20

7. When condensing gold foil, stepping of the condenser

Should involve overlapping the nib by one-fourth its radius

Should involve overlapping the nib by one-half its diameter

Produces a denser restoration and reduces the time of condensation

Produces a denser restoration but increases the time of condensation

Question 7 of 20

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

Str.salivarius

Str.mitis

Str. Sanguis

Str.rattus

Question 8 of 20

9. Which of the following is responsible for penetration of bacteria in caries of dentin

Pumping of bacteria into tubules due to fluid movement during mastication

Increased mobility of bacteria in dentinal tubules

Thermal changes in oral cavity during mastication

Change in salivary pH

Question 9 of 20

10. Root canal therapy is completed on a mandibular first molar and closed temporarily with a cotton pellet and a temporary sealing material, withplans for a definitive restoration to be placed as soon as possible. What is the most important factor in ensuring the success of the procedure?

Type of temporary sealing material

Marginal integrity of definitive restoration

Placement of a post

Type of definitive restoration

Question 10 of 20

11. Pregnant patients in the first trimester

Should delay use of x-ray until the second trimester.

Should receive the normal x-ray dose for endodontic therapy.

Are not at risk from pharmacologic intervention.

Are not candidates for electronic apex locators.

Question 11 of 20

12. Which of the following statements regarding caries risk assessment is correct?

The presence of pit-and-fissure sealants is a good indicator of current caries activity.

The presence of restorations is a good indicator of current caries activity.

The presence of restorations is a good indicator of past caries activity.

The presence of dental plaque is a good indicator of current caries activity.

Question 12 of 20

13. Alternating rotational technique uses which blank design

Triangular blank with cutting tip

Triangular without cutting tip

Square without cutting tip

Square with cutting tip

Question 13 of 20

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

Can cause external Resorption

Promotes the formation of reparative dentin

Has an alkaline pH

Produces no anti-microbial effect

Question 14 of 20

15. An upper central incisor in a 7 year old child has an open apex and needs to undergo root canal treatment. The best way to determine the working length in this case is by

Radiographic determination using IOPA X-ray

Using an apex locator

Tactile method

Paper point method

Question 15 of 20

16. Phoenix abscess is:

Chronic periapical abscess

Chronic exacerbation of acute periapical abscess

Acute exacerbation of chronic periapical abscess

Acute periapical abscess

Question 16 of 20

17. The first number on those instruments having three-number formula, indicates the

Length of the blade in tenths of a millimetre

Length of the blade in millimetres

Angle of the blade to the shaft in degrees centigrade

Width of the blade in tenths of a millimetre

Question 17 of 20

18. In root fractures of the apical one third of permanent anterior teeth, the teeth usually

Remain in function and are vital

Discolor rapidly

Are indicated for extraction and prosthodontic replacement.

Undergo pulpal necrosis and become ankylosed

Question 18 of 20

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

Is contraindicated because of the low edge strength of amalgam

Is unnecessary since the tooth structure in this area is strong

Should result in a long bevel

hould remove unsupported enamel that may fracture

Question 19 of 20

20. Function of post in an endodontically treated tooth is:

Provide support to restoration

Reinforces the restoration and the remaining tooth structure

Increases retention of the crown by providing parallel walls

Prevents root fracture

Question 20 of 20