Week 2 endo - Chemo mechanical prep

Question 2

What anatomical structure represents the ideal apical end-point for root canal filling?

Answer 2

d

Question 3

What reading on the Dentsply Propex Pixi indicates the file is just beyond the apex?

Answer 3

c

Question 4

At what distance short of the Zero reading should working length (WL) be set?

Answer 4

b

Question 5

Which of the following is used to create coronal flare in the Protaper Gold system?

Answer 5

c

Question 6

The file should be rotated back from the apex until the apex locator shows:

Answer 6

c

Question 7

Which part of the root anatomy corresponds to point ‘E’ in the diagram from the lecture?

Answer 7

c

Question 8

In clinical use, apex locators measure electrical resistance to identify:

Answer 8

c

Question 9

Which file sizes are recommended for establishing a glide path before rotary instrumentation?

Answer 9

b

Question 10

What is the function of a patency file?

Answer 10

c

Question 11

What is a common consequence of wedging the syringe tip during irrigation?

Answer 11

c

Question 12

According to Schilder’s principles, the overriding goal is to create a shape that allows:

Answer 12

c

Question 13

During Protaper Gold instrumentation, which files are used with a brushing motion?

Answer 13

b

Question 14

What is the in-out filing motion used for?

Answer 14

c

Question 15

Irrigation becomes truly effective only:

Answer 15

c

Question 16

Between each Protaper file, you should always:

Answer 16

c

Question 17

What is the purpose of the SX file in the Protaper Gold sequence?

Answer 17

c

Question 18

What is the ideal way to use the irrigation needle during canal cleaning?

Answer 18

d

Question 19

What is the risk of relying solely on radiographs for working length?

Answer 19

c

Question 20

What should be done before using rotary shaping files?

Answer 20

b

Question 21

Which file size is generally the last hand file before switching to rotary instrumentation?

Answer 21

c

Question 22

When using an electronic apex locator (EAL), what indicates you’ve passed through the apical foramen?

Answer 22

c

Question 23

The term “Zero reading” on an apex locator corresponds to:

Answer 23

d

Question 24

What is the best anatomical landmark to use as a stable reference point when measuring working length?

Answer 24

d

Question 25

Which hand files are essential for initial canal negotiation before using rotary files?

Answer 25

b

Question 26

What is the correct sequence when using shaping files in the Protaper Gold system?

Answer 26

b

Question 27

Which of the following is NOT a feature of the apical constriction?

Answer 27

c

Question 28

What is the major clinical goal when creating a glide path?

Answer 28

c

Question 29

During Protaper Gold use, a “brushing motion” is applied primarily to:

Answer 29

d

Question 30

What is a key safety measure when using syringe irrigation?

Answer 30

c

Question 31

The radiographic apex is best described as:

Answer 31

c

Question 32

After which file is irrigation most effective in decontaminating the canal system?

Answer 32

d

Question 33

Which Protaper Gold files are considered “finishing files”?

Answer 33

c

Question 34

Which is a potential consequence of not using a patency file between rotary files?

Answer 34

c

Question 35

Which hand file is often used to confirm patency during rotary instrumentation?

Answer 35

b

Question 36

What action should be taken if the apex locator displays an unstable or erratic reading?

Answer 36

b

Question 37

What feature distinguishes Protaper Gold files from conventional rotary NiTi files?

Answer 37

a

Question 38

The purpose of creating a coronal flare is to:

Answer 38

b

Question 39

Which of the following steps is crucial before inserting the apex locator file?

Answer 39

c

Question 40

What would be the result of stopping instrumentation at the radiographic apex instead of the apical constriction?

Answer 40

c

Question 41

Which protocol ensures the most accurate and conservative working length determination?

Answer 41

c

Question 42

41. What is the risk of filling beyond the apical constriction? a) Underfilling b) Perforation of the pulp chamber c) Extrusion of material into periapical tissues d) Loss of crown structure

Answer 42

c

Question 43

2. The brushing motion used with shaping files in Protaper Gold serves to: a) Prepare apical third b) Reduce cervical curvature c) Engage dentine evenly in the canal d) Shape canal away from curvatures

Answer 43

d

Question 44

43. Which of the following is true regarding apex locators? a) They determine the canal length from a radiograph b) They measure the length from CEJ to apex c) They determine the transition between soft and hard tissue d) They rely on canal diameter measurements

Answer 44

c

Question 45

44. What is the correct order of file use in a typical Protaper Gold protocol after glide path? a) F1 → S1 → SX b) SX → S1 → S2 → F1 → F2 c) S1 → S2 → F2 → F1 d) S1 → SX → F1 → F3

Answer 45

b

Question 46

45. Which phase of irrigation is considered the most effective for cleaning the canal system? a) During initial access b) During hand filing c) After shaping is complete d) While placing temporary dressing

Answer 46

c

Question 47

46. Failure to maintain patency during rotary instrumentation can result in: a) Excessive shaping b) Canal drying c) Apical blockage d) Improved obturation

Answer 47

c

Question 48

7. Which of the following is a radiographic structure that does NOT represent the true apical end point for instrumentation? a) Cemento-dentinal junction b) Radiographic apex c) Apical constriction d) Minor foramen

Answer 48

b

Question 49

48. The “major apical foramen” corresponds to which anatomical point? a) The point 0.5 mm short of working length b) The cementum junction c) The true radiographic apex d) The exit of the canal into periapical tissues

Answer 49

d

Question 50

49. What motion should be used with Protaper Gold finishing files (F1, F2)? a) Circumferential filing b) In-and-out pecking motion c) Clockwise only d) Vertical pumping

Answer 50

b

Question 51

50. What size hand file is generally used to confirm patency between rotary file steps? a) Size 15 b) Size 10 c) Size 20 d) Size 25

Answer 51

b

Question 52

51. What is the main reason for preflaring the canal before using an apex locator? a) Avoid ledging b) Prevent false readings from dentine interference c) Dry the canal thoroughly d) Shape the apical third

Answer 52

b

Question 53

52. Which file is designed to enlarge the coronal third of the canal in Protaper Gold? a) S2 b) SX c) F1 d) F2

Answer 53

b

Question 54

53. What should be done immediately after reaching full working length with a file? a) Proceed to obturation b) Flush the canal with saline only c) Irrigate and confirm patency d) Dry the canal

Answer 54

c

Question 55

54. What does the "glide path" help prevent during rotary instrumentation? a) Canal drying b) Debris formation c) Rotary file fracture and ledging d) Apical enlargement

Answer 55

c

Question 56

55. How can you ensure proper working length control with an apex locator? a) Read file length on x-ray b) Use size 15 file in dry canal c) Stop file when resistance is felt d) Establish zero reading, then subtract 0.5 mm

Answer 56

d

Question 57

56. Which motion is recommended for shaping curved canals with S1 and S2 files? a) Watch-winding b) Continuous in-and-out c) Brushing away from curvature d) Reciprocating

Answer 57

c

Question 58

57. Which solution is typically used in syringe irrigation during chemo-mechanical preparation? a) EDTA only b) Hydrogen peroxide c) Sodium hypochlorite (NaOCl) d) Alcohol

Answer 58

c