Endodontics Quiz Questions (Old)

Front 1

One of the objectives of access preparation as stated in the text is "to establish restorative margins to minimize marginal leakage of the restored tooth."

Back 1

True

Front 2

The "Laws of Access Preparation" listed in the text are so-called because they are always true.

Back 2

False

Front 3

Failure to carefully analyze the long axis of the root(s) both in the mesiodistal and buccolingual directions can result in gouging or perforation because premolar roots often are tilted relative to the occlusal plane.

Back 3

True

Front 4

The error with the greatest potential for medical and legal damage is entering the wrong tooth because of incorrect dental dam placement.

Back 4

True

Front 5

According to the text, the clincian should mark the tooth to be treated with a felt-tip marker before the dental dam is placed if any adjacent teeth might be confused with it.

Back 5

True

Front 6

On maxillary anterior teeth, complete pulp chamber roof and pulp horn removal is confirmed by feeling for catches along the walls with a #17 hooked-end explorer on withdrawal from the pulp chamber.

Back 6

True

Front 7

The lingual shoulder is the lingual shelf of dentin that extends from the cingulum to a point about 2 mm apical to the canal orifice inside the access preparation of anterior teeth.

Back 7

True

Front 8

The lingual shoulder must be preserved during anterior tooth access.

Back 8

False

Front 9

A ledge is an iatrogenically created root canal wall irregularity that may impede placement of an intracanal instrument to the apex.

Back 9

True

Front 10

In the maxillary central incisor, the cavosurface outline form of the access changes from triangular to a more oval shape as the tooth matures and the pulp horn recedes.

Back 10

True

Front 11

An important feature of "ISO-normed instruments" is a defined increase in tip diameter of 0.05 mm or 0.1 mm, depending on the instrument size.

Back 11

True

Front 12

"K-files" are made by grinding flutes into a round metal blank.

Back 12

False

Front 13

Extraction and Root Canal Treatment have the same primary goal: removal of a source of inflammation, but are at opposite ends of the "conservation" spectrum.

Back 13

True

Front 14

Gates-Glidden drills are used mainly in preliminary shaping of the coronal one-third of the canal.

Back 14

True

Front 15

Two properties of Nickel-Titanium alloys that allow continuously-rotating instruments to be used in curved root canals are 1) superelasticity and 2) high resistance to cyclic fatigue.

Back 15

True

Front 16

A fractured instrument tip left in a root canal, virtually assures post-treatment disease.

Back 16

False

Front 17

When an instrument rotates around a curve, larger diameters are more robust and resistant to fracture.

Back 17

False

Front 18

Using current high-tech canal preparation techniques, the goal of mechanical preparation of all root canal surfaces is routinely accomplished.

Back 18

False

Front 19

Using a straight instrument, however flexible, with a filing motion in a curved canal will result in transportation.

Back 19

True

Front 20

The choice of apical preparation design is influenced mostly by the intended obturation technique.

Back 20

True

Front 21

Successful root canal treatment is based on these principles" diagnosis and treatment planning; knowledge of anatomy and morphology; the traditional concepts of debridement, thorough disinfection, and obturationl and the coronal restoration.

Back 21

True

Front 22

The following four factors are shown to influence success: the absence of a pretreatment periapical lesion, root canal filling with no voids, obturation to within 2.0 mm of the apex, and an adequate coronal restoration.

Back 22

True

Front 23

Teeth that are poorly obturated are often poorly prepared.

Back 23

True

Front 24

When bacteria are present at the time of obturation, studies show there is a correlation between the quality of obturation and nonhealing.

Back 24

True

Front 25

At present there is no effective method for determining whether cleansing and shaping procedures have been effective.

Back 25

True

Front 26

The criteria of clean dentinal fillings and/or enlargement beyond the first file to bind at working length have proved to be unreliable.

Back 26

True

Front 27

It is not possible to assess the quality of the seal established during obturation with a radiograph, and it is important to remember that no material or technique prevents leakage.

Back 27

True

Front 28

At present the consensus is that one-step treatment procedures are acceptable when the patient exhibits a completely or partially vital pulp.

Back 28

True

Front 29

When pain occurs as the result of irreversible pulpitis, obturation can occur at the initial visit because removal of the vital tissue will generally resolve the patient's pain.

Back 29

True

Front 30

According to Dr. Weeks, the three most important things in endodontics are Obturation, Obturation and Obturation.

Back 30

False

Front 31

Apexification is treatment designed to preserve vital pulp tissue in the apical part of a root canal in order to complete formation of the root canal apex.

Back 31

False

Front 32

Calcium hydroxide intracanal medication is a quick-acting antimicrobial effective in seconds to minutes.

Back 32

False

Front 33

Calcium hydroxide intracanal medication has the extraordinary ability to neutralize the biologic activity of lipopolysaccharide (LPS).

Back 33

True

Front 34

It is generally believed that the major cause of RCT failure is survival of microorganisms in the apical portion of the root-filled tooth.

Back 34

True

Front 35

Enterococcus faecalis is a gram negative rod.

Back 35

False

Front 36

Enterococci species are found in vast quantities in the human intestine.

Back 36

True

Front 37

Bacterial isolates from canals of failed RCT (persistance of disease) are essentially the same species isolated from canals before RCT.

Back 37

False

Front 38

When making post space a minimum of 2 mm of well condensed gutta-percha and sealer must remain to insure an apical seal.

Back 38

False

Front 39

One of the functions of a post is to protect the apical root canal seal from bacterial contamination in case of coronal leakage.

Back 39

True

Front 40

The tooth is weakened if dentin is removed to place a larger-diameter post.

Back 40

True

Front 41

Kakehashi Et al, showed in their studies that even in the face of gross food impactions that the presence or absence of microbial flora is the major determinant in the healing of exposed rodent pulps.

Back 41

True

Front 42

Since the pulp is encased in ridged walls and forms a low compliance systeml a small increase in tissue pressure causes compression of the entire pulp, strangling the pulp and leading to total necrosis.

Back 42

True

Front 43

Depending on the severity and duration of the insult and the host capacity to respond, the pulpal response goes from transient inflammation (reversible pulpitis) to irreversible pulpitis, and then to total necrosis.

Back 43

True