NBDE 2 Important Endodontics Questions-2

QUESTION: Which teeth do vertical fractures more common?
– Lower posterior teeth.

QUESTION: What causes most vertical root fractures?
Condensation of gutta percha

QUESTION: most probability of vertical root fracture
– isolated pocket depth

QUESTION: isolated pocket . What condition?
Vertical root fracture
– Cracked toothsyndrome

QUESTION: Which one has a different transillumination?
-cracked tooth

QUESTION: which allows the enitre tooth tooth to light up under transillumination?
Again cracked tooth

QUESTION: When does transillumiator show evenly through tooth: craze line, crack, fracture
from crown to root:craze line

QUESTION: when does translumination shows the whole crown : a) fracture cusp b)
cracked tooth
c) craze lines
Whole tooth = craze line

QUESTION: Type of fracture that lets light pass completely through…
a. crazed CRAZE LINE
b. split tooth

QUESTION: Which will show up on transillumination best?
Cracked tooth
Fractured cusp
Craze line

QUESTION: Which will show up on transillumination best?
Cracked tooth
Fractured cusp
Vertical root fracture
Craze line

QUESTION: Vertical root fractures are also called cracked teeth. The prognosis of cracked teeth varies with extent and depth of crack.
a. Both statements are true
b. Both statements are false.
c. First statement is true, second is false.
d. First statement is false, second is true.

QUESTION: If two cavities were thought to be two separate fillings but upon exam it was a crack through the isthmus. What do we tx this symptomless crack with?
– observe

QUESTION: most common tooth associated w/ cracked tooth syndrome:
Mandibular second molars, followed by mandibular first molars and maxillary premolars, are the most commonly affected

QUESTION: Crack tooth syndrome is most likely found?
Mandibular Molars

QUESTION: Most common to have cracked tooth
= mand 1st molar (mand 2nd first) MD direction

QUESTION: horiz root fracture
a. reduce & immobilize

QUESTION: How do you first tx a horizontal root fracture?

Immobilize the segments for
12weeks b.SPLINT

QUESTION: Apical horoziontal root fracture: no pain, what do you do? Rct, scaling, rct if tested nonvital, monitor 1 year

QUESTION: Horizontal Root Fracture more common in anteriors, the success and healing of horizontal root fractures is the immediate reduction of the fractured segments and the immobilization of the coronal segment 12 weeks

QUESTION: Horizontal rooth fracture: take multiple vertical angulated xrays

QUESTION: Most common teeth with crown to root fracture? Mand molars

QUESTION: which tooth is least likely to fracture: mx premolar, mx molar, md premolar, md molar

QUESTION: which tooth is most commonly fractured? mx incisors, md incisors, etc.

QUESTION: Chronic endo lesion, what type of bacteria? Anerobes ANS (multiple anerobes)

QUESTION: Reason for failed endo?
Seal 2mm away from apex
Bacterial infection
RCT sealer beyond apex
Forgot other one

QUESTION: Endo f ile breaks when you at 15 file. refer to endodontist.(retrieving it was not an

QUESTION: If file breaks tooth asx:
• Leave and monitor

QUESTION: You being the best doctor in the world, you broke a 5mm dental instrument in a
canal during
RCT procedure, what’s the best thing to do? – Tell the patient what happened, and refer her to an
endodontist. (Other choices were, take a picture and only tell patient if you see the instrument in
there, reschedule
patient to continue with RCT, Put a watch on it)

QUESTION: Endo on a molar.
Break a file on apical level, what should you do?
-write on med history and continue?
-refer patient to specialist?- if it was in middle third you would continue treatment.

QUESTION: what file was the endodontist using?
Stainless steel
Ni Ti

QUESTION: What is not an advantage of NiTi over stainless steel
Ability to stay centered in canal
Something aided depth penetration into canal

QUESTION: all are advantages of using nickel titanium endo files over regular steel files
a. flexibility (yes)
b. bending memory (yes)c. direction of the flutes (no)?

QUESTION: What is the weakness of Ni files vs regular- strength, flexibility… and some other
choices ( I wrote strength)

QUESTION: What is the NOT an advantage of stainless steel files? 1. More flexible.., 2. Less
chance for
breaking, 3. Allows the file to be centered in canal,
NiTi rotary files remain better centered, produce less transportation, and instrument faster than
steel files due to their superior flexibility and resistance to torsional fracture. They have 10x the
resistances of stainless steel (stronger).

QUESTION: Which of the following is not an advantage of Ni-Ti over stainless steel file?
a. Maintains the shape of canal,
b. flexibility,
c. resistance to fracture.

QUESTION: you separate an endo file 3mm from the apex and obturate above it… which case will show the best prognosis?
a. vital pulp w/ no periapical lesion(yes)
b. vital pulp wI periapical lesion
c. necrotic pulp wI no periapical lesion
d. necrotic pulp wI periapical lesion

QUESTION: Best prognoses for a broken instrument at apical third?
Vital pulp with no PA abscess
Necrotic pulp with no PA abscess
Vital pulp with PA abscess
Necrotic pulp with PA abscess

QUESTION: which has worst prognosis? File fracture, transportation, through furcation

QUESTION: How many canals do you expect in primary M2: four

QUESTION: Access design
–mandibular is trapezoid

QUESTION: What is the shape of the access of mandibular 1st molar?
A. Square
B. Trapezoid**

QUESTION: maxillary 1st molar access opening
: triangular

QUESTION: Pulpal anatomy dictates a triangular-access cavity preparation in the MAXILLARY

QUESTION: why do you do triangular access on incisors (max central inccisor?)
a. to help with straight line access
b. help expose pulp horn
c. to follow the shape of the crownQUESTION: Ept tests whether its responsive or nonresponsive that’s it
=not tell level of necrosis/how vital the tooth

QUESTION: EPT – responsivness
Means not healthy tooth

QUESTION: How does a tooth covered with crown react to pulp testing—
cold is better test (thermal)

QUESTION: what can you diagnose with the EPT test :
pulpal necrosis

QUESTION: How do you differentiate between an endo/perio lesion?

QUESTION: EPT: to differentiate if perio (some response to ept) or endo(necrotic, no response
to EPT)

QUESTION: Vitality test used to distinguish periodontal from endo lesion –
vitality and probing depths

QUESTION: know best way to diagnose irreversible pulpitis ?
heat. Cold/ thermal test

QUESTION: EPT is more accurate than cold test for pulp necrosis?

QUESTION: What is untrue about EPT?
It is more reliable than cold testing for necrotic teeth (false!!!)
It gives relative health status of pulp (true)
Tells if there are vital nerve fibers (true)

QUESTION: EPT does NOT indicate health of the pulp

QUESTION: EPT- compared to cold test it is superior (False)….

QUESTION: What is not true regarding electric pulp test
: Doesn’t tell you about vascular or
something like that (doesn’t tell you about vascularity of pulp which is true pulpal diagnosis)

QUESTION: Did not respond thermal and ept but response to palpation and percussion?
Necrotic pulp

QUESTION: Most reliable way to test vitality of a tooth?
a final diagnosis, because EPT can have may false readings

QUESTION: Luxated tooth, negative EPT – disruption of nerves to tooth

QUESTION: Best prognosis of perio endo lesion
• Endo with rct – perform first
• Perio scaling and root planning

QUESTION: what is initial treatment of combination perio and endo lesion:
do rct first
perio first,

QUESTION: Pulp vitality testing. Difference between perio and endo periapical lesions. Best
prognosis –
perio started from endo DONT KNOW
, or endo started from perio?QUESTION: test performed to differentiate endo vs. perio lesions
: Percussion

QUESTION: Percussion: can identify perio involvement

QUESTION: Difference b/w acute apical abscess and lateral periodontal abscess:

QUESTION: lateral periodontal abscess is best differentiated from the acute apical abscess by?
a-pulp testing
b.radiographic appearance
c.probing patterns

QUESTION: how do you distinguish acute apical absess and periodontal absess : vitality

QUESTION: differential diagnosis of periodontal abscess and periradiculal abscess?
b. vitality test

QUESTION: on primary teeth you dont want to use ept

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