Endodontics & Conservative Dentistry #2

1. Which of the following statement(s) is(are) true regarding treatment of a tooth presenting with a sinus tract?

Antibiotics are not needed.

All of the above choices are true.

Treat with conventional root canal therapy.

The sinus tract should heal in 2 to 4 weeks after conventional root canal therapy.

Question 1 of 20

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

1 month

3 - 4 months

1 year

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

Question 2 of 20

3. What will happen if MTA is mixed for more than 4 minutes:

Fastens setting time

Apical Barrier formation is defective

Compressive strength decreases

Dehydration of mass occurs

Question 3 of 20

4. Ha Primary tooth is avulsed, what should be done:

Not replanted

Treated with citric acid for 5 minutes before replantation

Gently debrided and replaced in the socket with flexible splinting

Gently debrided and replaced in the socket with rigid splinting

Question 4 of 20

5. Chronic caries is characterized by which of the following.

pain is common

entrance to the lesion is small

lesion is deep and narrow

common in adults

Question 5 of 20

6. Suspension liners, for example calcium hydroxide, harden intraorally by the:

Physical reaction of drying

Chemical reaction involving chelation

Chemical reaction of acids and bases

Chemical reaction involving polymerization

Question 6 of 20

7. During the master cone fitting procedure in the endodontic treatment of a patient's tooth, the patient says he has a "sharp shooting pain in the same tooth that ached earlier. "What should be your response and why?

Continue with obturation, this is a normal complaint during this part of the procedure

Consider looking for an accessory canal and refiling, there is likely pulpal issue that has not been properly debrided

Irrigate further, the sodium hypochlorite should take care of this problem

Temporize the tooth and obturate at a later date

Question 7 of 20

8. Electric pulp testing can give a false positive reaction in which of the following?

Anxious patient

Traumatic injury to teeth

Calcified root canals

Patient on NSAIDs

Question 8 of 20

9. Pulpal pain response is

Quick and sharp when carried by myelinated c libers.

Quick and sharp when carried by unmyelinated c fibers.

Dull and throbbing when carried by myelinated c fibers.

Dull and throbbing when carried by unmyelinated c fibers.

Question 9 of 20

10. While making an access opening for root canal treatment of Maxillary first premolar, chances of perforation are high if the operator is not aware of:

Concavity at CEJ on distal root surface

Proximity of furcation to floor of pulp chamber between the buccal and lingual root

Rudimentary palatal cusps

Concavity at CEJ on mesial root surface

Question 10 of 20

11. Hand endodontic instrument used to locate canal orifice:

Endo orifice finder

Gates Glidden drill

Endodontic explorer

Barbed broach

Question 11 of 20

12. A casting may fail to seat on the prepared tooth due to all of the following factors except _____.

Undercuts present in prepared tooth.

Proximal contact(s) of casting are too heavy or too tight.

Temporary cement still on the prepared tooth after the temporary restoration has been removed.

The occlusal of the prepared tooth was under reduced.

Question 12 of 20

13. A root canal treated anterior tooth had radiolucency at the apex. Curettage of the tooth was done and biopsy was performed. Two years later, the size of radiolucency was double its size at the time of surgery. What is the likely cause

Actinomyces infection

Missed accessory canal

Leakage from poorly debrided or obturated canal

Failure to resect root apex

Question 13 of 20

14. You completed a root canal procedure on tooth #9 approximately 6 months ago. Your patient is still reporting persistent symptoms of acute apical pathosis including sensitivity on mastication and a dull ache, and the periradicular radiolucency that was visible on your obturation radiograph has not appeared to decrease in size. The most likely reason for the persistence of these symptoms is

Root canal failure

Trigeminal neuralgia

Phantom tooth pain

Traumatic occlusion

Question 14 of 20

15. The main purpose of finishing the enamel wall of a prepared cavity is to

Ensure parallelism of the walls

Prevent microleakage

Smoothen the walls of the cavity to permit accurate adaptation of the restorative material

Remove loose enamel rods

Question 15 of 20

16. A canal is prepared apically to size 40.it is found that sizes 20 to 35 can pass beyond working length, but size 40 wont.what kind of apical prep is this

apical stop

open apex

closed apex

apical seat

Question 16 of 20

17. Patients scheduled for retreatment

May expect to have less interappointment pain.

Should expect surgical intervention.

May complain of thermal response on an adjacent tooth.

Should expect successful resolution.

Question 17 of 20

18. A major difference between total-etch and selfetching primer dentin bonding systems include all of the following except _____.

The amount of smear layer removed

The need for wet bonding

The time necessary to apply the material(s)

The bond strengths to enamel

Question 18 of 20

19. Smooth surface caries refers to _____.

Occlusal pits and grooves

Mesial and distal surfaces

Facial and lingual surfaces

Both A and C.

Question 19 of 20

20. Which of the following is the most predominant organism in failed Root Canal Treatment cases

Fusobacterium

Streptococci

Lactobacilli

E. Faecalis

Question 20 of 20