Endo. Cons Revision #4

1. 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:

Periodontic treatment followed by endodontic treatment

Extensive periodontal treatment followed by vitality reassessmen

Endodontic treatment only

Endodontic treatment followed by periodontic treatment

Question 1 of 20

2. A 7-year-old boy arrives at the office with a complaint that tooth #8 is draining pus into his mouth. The tooth had been traumatized earlier. The vitality tests reveal no response. What is the treatment of choice?

Apexogenesis

Extraction

Apexification

It is only necessary to give the child analgesics and antibiotics for pain and infection

Question 2 of 20

3. 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 bicuspidation of the tooth

Extract the tooth

Prepare and obturate up to the separated instrument

Perform a root amputation

Question 3 of 20

4. A dentin bonding agent has a hydrophilic and a hydrophobic end. Of the two ends, the hydrophilic end binds to the:

Collagen of dentin

Calcium of enamel

Hydroxyapatite of hard tissues

Resinous restorative material

Question 4 of 20

5. Abrasive particle size in fine grit diamond point:

88-125 microns

76-85 microns

60-75 microns

38-44 microns

Question 5 of 20

6. Dental amalgam, when used in the restoration of a cusp should be

Carved out of occlusion

Supported by enamel

At least 2 to 3 mm thick

Supported by a pin

Question 6 of 20

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

Chemical reaction of acids and bases

Physical reaction of drying

Chemical reaction involving chelation

Chemical reaction involving polymerization

Question 7 of 20

8. 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.

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

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

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

Question 8 of 20

9. Which of the following best describes the anesthetic effects of a posterior superior alveolar nerve block?

Pulpal anesthesia of the maxillary first and second premolars.

Pulpal anesthesia of the maxillary second and third molars.

Pulpal anesthesia of the maxillary first molar.

Pulpal anesthesia of the second premolar.

Question 9 of 20

10. Which of the following is not true regarding the use of twist drills?

They, cut only at the tip

A pumping action is used to aid in chip removal

Spiral drills should never be used in a slow speed hand piece

The drill must not stop rotating while in the pin hole

Question 10 of 20

11. Which of the following materials has the highest linear coefficient of expansion?

Amalgam

Composite resin

Direct gold

Tooth structure

Question 11 of 20

12. Which tooth has a wide variation in root canal anatomy:

Mandibular first premolar

Mandibular second premolar

Maxillary first premolar

Maxillary second premolar

Question 12 of 20

13. If F2 protaper is cut 1 mm short at apex, what will be the effective diameter

0.31 mm

0.29 mm

0.33 mm

0.30 mm

Question 13 of 20

14. Which of the following results may be expected following surgery when both the buccal and lingual cortical plates have been lost?

Ankylosis.

Normal bone regeneration.

Scar tissue formation.

Osteosclerosis.

Question 14 of 20

15. Triturating a dental amalgam will _____.

Coat the alloy particles with mercury

Dissolve the alloy particles in mercury

Reduce the crystal sizes as they form

Reduce the size of the alloy particles

Question 15 of 20

16. An Asian patient presents to your office with pain bilaterally in her lower second premolars. Both teeth are sensitive to percussion and show periapical radiolucencies on radiographic examination. The teeth do not respond to either cold or electric pulp tests. There is an irregular bulge on the occlusal surfaces of each tooth. The most likely diagnosis is:

Pulp stones

Dens invaginatus

Irreversible pulpitis

Dens evaginatus

Question 16 of 20

17. In the conventional Class I composite preparation, retention is achieved by which of the following features? 1.Occlusal convergence 2.Occlusal bevel 3.Bonding 4.Retention grooves

2 and 3

1 and 4

2 and 4

1 and 3

Question 17 of 20

18. As caries progresses from enamel to dentin and toward the pulp interproximally, the radiographic appearance resembles which of the following?

V shape in the enamel with the apex toward the DEJ and V shape in dentin with apex toward the pulp

V shape in enamel with apex toward the proximal surface and V shape in dentin with the pex toward the pulp, resulting in a diamond appearance

V shape in enamel with the apex toward the DEJ and V shape in dentin with the apex toward the DEJ, resulting in a bowtie appearance

V shape in enamel with the apex toward the proximal surface and V shape in dentin with the apex toward the DEJ

Question 18 of 20

19. Retention form for a Class II amalgam preparation is ensured by

Grooves placed at the expense of the axiofacial and axiolingual line angles

The gingival seat

Parallelism of buccal and lingual walls

All of the above

Question 19 of 20

20. Enameloplasty is indicated in carious tooth when caries extend to a depth of:

Upto 1/2 the thickness of enamelUpto 2/3rd the thickness of enamel

Upto 1/3rd the thickness of enamel

Enameloplasty can be done irrespective of fissure depth

Question 20 of 20