Endodontics & Conservative Dentistry #14

1. Common signs of trauma from occlusion include

None of the above

Thermal sensitivity

Root Resorption

Vertical bone loss

Question 1 of 20

2. Most important factor in success of a replanted avulsed tooth:

Duration of extraoral dry time

Presence of a healthy periodontium

Operator skill

All of the above

Question 2 of 20

3. A No. 4 bur is

A round bur

An inverted cone bur

A straight fissure bur

A cross-cut tapered fissure bur

Question 3 of 20

4. Type of root resorption that occurs from a combined injury to PDL and cementum, complicated by bacteria from an infected root canal space:

Replacement Resorption

Inflammatory Resorption

Surface Resorption

Internal resorption

Question 4 of 20

5. When comparing pin retention with slot retention for a complex amalgam restoration, which of the following statements is false?

Slots are used where vertical walls allow opposing retention locks.

Pin retention is used primarily where there are few or no vertical walls

Slots and grooves can be used interchangeably.

Slots provide stronger retention than pins.

Question 5 of 20

6. Initial instrumentation in endodontic treatment is done to the level of the _____.

Cementopulpal junction

Cementodentinal junction

Dentinoenamel junction

Radiographic apex

Question 6 of 20

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

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.

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

True allergies to amalgam rarely have been reported.

Question 7 of 20

8. You are doing a deep occlusal preparation on tooth #30. The tooth was asymptomatic prior to treatment. All caries have been removed, but you notice a pinpoint mechanical pulpal exposure. Hemorrhage is easily stopped. The treatment of choice is:

Direct pulp cap

Indirect pulp cap

Root canal therapy

Pulpotomy

Question 8 of 20

9. The retention-resistance form of a Class II inlay cavity is dependent upon all of the following, except

Proximal box form

Gingival bevels

Occlusal dovetail

Flat gingival and pulpal walls

Question 9 of 20

10. When the gingival margin is gingival to the CEJ in a Class II amalgam preparation, the axial depth of the axiogingival line angle should be _____.

0.2 mm into sound dentin

Twice the diameter of a No. 245 carbide bur

The width of the cutting edge of a gingival marginal trimmer

0.75 to 0.80 mm

Question 10 of 20

11. A patient presents to your office for initial examination. A root canal procedure had been completed on tooth #3 a year prior. Upon clinical examination, you observe a narrow periodontal pocket measuring the full length of your probe in the area of the mesial root. Upon radiographic examination, you detect a J-shaped radiolucency surrounding the mesial root. Your initial diagnosis is:

Periodontal abscess

Ledging of the mesial root

Incomplete debridement of the mesial root

Vertical fracture of the mesial root

Question 11 of 20

12. Which of the following is the most characteristic radiographic evidence of a vertical root fracture?

A visible fracture when transillumination is used

A radiolucent halo surrounding the root of the fracture

A radiopaque lesion at the sight of the fracture

A persistent periodontal defect

Question 12 of 20

13. Which of the following may be an adverse systemic reaction to aluminium chloride impregnated gingival retraction cords?

Increased heart rate

Increased respiratory rate

Elevated blood pressure

None of the above

Question 13 of 20

14. Which perforation location has the best prognosis?

Middle third of root

Chamber floor

Coronal third of root

Apical third of root

Question 14 of 20

15. Which of the following teeth is most likely to have a curved root?

Mandibular central incisor

Maxillary lateral incisor

Maxillary central incisor

Maxillary canine

Question 15 of 20

16. When luting a casting with resin cements, the flash should to removed

When the cement is in rubbery stage

Immediately after seating the casting

After polymerization of the cement is completed

Time of flash removal is not critical

Question 16 of 20

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

Biocompatibility of material

Final application thickness

Degree of hardness

Degree of pulpal protection

Question 17 of 20

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

Collagen of dentin

Resinous restorative material

Calcium of enamel

Hydroxyapatite of hard tissues

Question 18 of 20

19. You have initiated root canal therapy on a patient when he suddenly experiences sudden pain during working length determination, begins to hemorrhage, and detects a burning sensation when you attempt to irrigate with sodium hypochlorite. What is the most likely cause of these symptoms?

Incomplete canal debridement

Root canal contamination

Root perforation

Inadequate straight line access

Question 19 of 20

20. Extension for prevention is directly related to the

Rounding of the line angles

Removal of unsupported enamel rods from the proximal surfaces

Depth of the cavity

Outline form of the cavity

Question 20 of 20