Endodontics & Conservative Dentistry #12

1. The ability of a cavity to resist dis-placement of the restoration in any direction, is due to the

Convenience form

Retention form

Outline form

Resistance form

Question 1 of 20

2. A patient with previous history of trauma to tooth reveals metallic sound on percussion of the central incisor. The possible injury that occurred was:

Lateral luxation

Concussion

Extrusion

Subluxation

Question 2 of 20

3. Purpose of giving occlusal offset:

Gingival preservation

Resistance and retention

Esthetics

Structural durability

Question 3 of 20

4. 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

Using an apex locator

Tactile method

Paper point method

Radiographic determination using IOPA X-ray

Question 4 of 20

5. You have placed files in all three canals located in tooth #19 during a root canal procedure to obtain measurement. Upon taking the first radiograph, the two files in the distal canal are superimposed. For your second radiograph, you move the cone to the mesial. The resulting image shows both files in the distal canal. The file that has moved to the mesial is positioned:

Lingually

Distally

Buccally

Mesially

Question 5 of 20

6. In order to complete a cutting circle of the anal wall, the triangular shaft instrument requires:

1/4 turn

1/2 turn

Full turn

1/3 turn

Question 6 of 20

7. Tooth with definite single root canal:

Maxillary second premolar

Maxillar?y canine

Mandibular first premolar

Maxillary central incisor

Question 7 of 20

8. While obturation selection of master cone is based on:

The cone must bind loosely in the canal and reach within 1 mm of the radiographic apex

The cone should have a wiggly appearance and reach within 1mm of radiographic apex

The cone must fit well in the canal and be at the radiographic apex

The cone must fit well in the apical third of the canal and be within 1mm of the radiographic apex

Question 8 of 20

9. Extension for prevention is directly related to the

Rounding of the line angles

Depth of the cavity

Removal of unsupported enamel rods from the proximal surfaces

Outline form of the cavity

Question 9 of 20

10. All of the following statements regarding adjuncts to endodontic treatment are true EXCEPT

Intentional replantation is a viable alternative to endodontic surgery

Transplanted teeth with partial root development have a better prognosis than do those with developed roots

Orthodontic extrusion is commonly indicated prior to implant placement

A major disadvantage of endodontic implants is the lack of an apical seal

Question 10 of 20

11. A patient reports with acute apical abscess. Drainage is established through emergency root canal access. Should the access opening be kept open till the next appointment:

It should never be kept open

After immediate drainage, patient should be made to sit for some time; canal should be closed when it can be dried

Yes, only in weeping canals

Yes, if swelling is present

Question 11 of 20

12. Which Root canal irrigant has been shown to cause allergic reactions:

Povidone iodine

Superoxide water

Hydrogen peroxide

Chlorhex

Question 12 of 20

13. The success of an amalgam restoration is dependent on all of the following features of tooth/cavity preparation except _____.

Adequate tooth removal for appropriate strength of the amalgam

Adequate retention form features to mechanically lock the amalgam in the preparation

Divergent (externally) preparation walls

Butt-joint cavosurface margin that results in a 90-degree margin for the amalgam

Question 13 of 20

14. During an intracoronal bleaching procedure the surface to which bleaching agent is applied is the?

Lingual

Facial

Mesial

Distal

Question 14 of 20

15. Cells in asymptomatic apical periodontitis lesions:

Derivatives of disintegrated cell membrane

Macrophages & lymphocytes

Osteoclasts

Foamy macrophages & neutrophils

Question 15 of 20

16. During instrumentation of the mesial root of tooth #30, your file separates and remains stuck in the canal. In an attempt to remedy this procedural error, you attempt to bypass and remove the instrument. If you are unable to remove the instrument, what should your next step be?

Perform a root amputation

Extract the tooth

Prepare and obturate up to the separated instrument

Perform a bicuspidation of the tooth

Question 16 of 20

17. Which investment is usually used for casting base metal alloys?

Silica bonded

Carbon bonded

Phosphate bonded

Gypsum bonded

Question 17 of 20

18. To avoid pulpal irritation below any restorative material, the minimum thickness of the dentine should be

1.5mm

2.5 mm

2 mm

1.3mm

Question 18 of 20

19. Which of the following materials could be used to cement a bridge and fill a cervical lesion?

Zinc Phosphate

Glass Ionomer

Zinc Oxide-Eugenol

Zinc Polycarboxylate

Question 19 of 20

20. Which of the following is not suggested as irrigants during root canal therapy

Hydrogen peroxide

Urea peroxide (Gly-Oxide)

Sodium hypochlorite

Calcium hydroxide

Question 20 of 20