Final

Question 1

what irrigation do bugs hate the worst?

Answer 1

NaOCl

Question 2

what two anatomical pathways of communication exist between dental pulp and periradicular tissues?

Answer 2

Apical Foramen

lateral furcation canals

Question 3

what pathways exist for root canal infection?

Answer 3

1. dentinal tubules
2. direct exposure
3. biofilm
4. anachoresis

Question 4

when would you see a J shaped lesion?

Answer 4

vertical root fracture(narrow probing depth, may appear similar to lesion of pulpal origin)

Question 5

If you have multiple wide probing depths you have a perio, endo or cracked tooth problem?

Answer 5

Perio

Question 6

If you have a single narrow probing depth that may extend to the apex you have a perio, endo, or cracked tooth problem?

Answer 6

Endo

Question 7

If you have an isolated, narrow probing depth you have a perio, endo, or cracked tooth problem?

Answer 7

Cracked tooth

Question 8

in apical constriction this point is the narrowest point

Answer 8

minor apical diameter

Question 9

after the apical constriction this point flares outward

Answer 9

major apical diameter

Question 10

T or F: apical constriction is clinically evident in all teeth

Answer 10

False

Question 11

apical constriction can be defined as

Answer 11

the narrowest part of the canal formed by Cemento Dentinal Junction

• junction of pulp and periodontium
• best place to end root canal

Question 12

what 3 things can happen after pulp trauma?

Answer 12

1. complete recovery
2. pulp tissue replaced with calcified tissue
3. pulp necrosis(can lead to external resorption sometimes internal resorption)

Question 13

what type of trauma has no displacement, no mobility, percussion sensitive

Answer 13

concussion

no treatment

Question 14

what type of trauma has no displacement, mobile, percussion sensitive

Answer 14

subluxation

no treatment

Question 15

what type of trauma has apical displacement, no mobility, can re-erupt spontaneously if apex is immature, oath extrusion if mature apex and high incidence of ankylosis?

Answer 15

Intrusive trauma

Tx: RCT

Question 16

what type of trauma has coronal displacement,is mobile,x ray shows displacement, pulp test–>nonvital

Answer 16

Extrusion
tx reposition splint 2-4 weeks
RCT later if needed

Question 17

what type of trauma has MDBL displacement

Answer 17

lateral

tx: reposition, splint, RCT later if needed

Question 18

what type of trauma has complete displacement from socket

Answer 18

Avulsion

tx: immediate reimplantation and splint

Question 19

which teeth have 1 canal generally?

Answer 19

maxillary incisors and canines

Question 20

how many canals do maxillary 1st premolars have

Answer 20

1 or 2

Question 21

how many canals do maxillary 2nd premolars have

Answer 21

generally 1

Question 22

how many canals do maxillary molars have?

Answer 22

3-4
*MB root has 1-2
other roots only have 1

Question 23

how many canals do mandibular incisors have?

Answer 23

2

Question 24

how many canals do mandibular canines have

Answer 24

1

Question 25

how many canals do mandibular premolars have?

Answer 25

1-2

Question 26

how many canals does the mandibular 1st molar have

Answer 26

4

Question 27

how many canals does mandibular 2nd molar have

Answer 27

3

Question 28

define ledge formation

Answer 28

when working length can no longer be negotiated and original patency is lost

Question 29

what 4 things cause ledge formation

Answer 29

1. inadequate straight line access
2. inadequate irrigation or lube
3. excessive enlargement of curved canal with files
4. packing debris in apical portion of canal

Question 30

what should you do to fix a ledge

Answer 30

try #10 file with picking motion then rasping up and down

if you can’t regain access use ledge location as new WL and try to remove

Question 31

if an instrument separates in the canal what should you do

Answer 31

have an endodontist retrieve it

Question 32

This works to remove inorganic components(hard tissue-dentin and calcifications) leaves organic tissue intact

Answer 32

EDTA

-actively removes smear layer

Question 33

this irrigation solution dissolves vital and necrotic tissue including the smear layer

Answer 33

sodium hypochlorite

Question 34

this irrigation solution has broad-spectrum antimicrobial sustained action
doesn’t remove smear layer

Answer 34

chlorohexidine

Question 35

you cannot use this irrigant with NaOCL because it will form precipitate

Answer 35

chlorohexidine

Question 36

this irritant demineralizes the dentin wall, smear layer and dentin tubules

Answer 36

EDTA

Question 37

if the item moves the same way as you moved the sensor its on the _______

Answer 37

LINGUAL

Question 38

if the item moves the opposite way from which you move the radiograph it is on the____

Answer 38

Buccal

Question 39

when would you do incision and drainage?

Answer 39

1. necrotic pulp with flucuate swelling and no drainage
2. necrotic pulp with diffuse swelling and no drainage
3. possibly in acute apical abscess
4. fistulous tract/abscess

Question 40

when doing an incision and drainage where do you cut to?

Answer 40

deep incision to base of alveolar bone, dissect what you need then place drain

Question 41

what 2 situations could you try regenerative endodontics?

Answer 41

1. pulp necrosis with immature root apex

2. pulp space not to be used in restoration(ex:post)

Question 42

what 2 things are considered when treating avulsions?

Answer 42

1. time out of mouth

2. mature/immature apex

Question 43

if an avulsion took place less than 60 min ago and apex is closed how do you treat?

Answer 43

1. irrigate socket
2. reimplant and splint 2 weeks
3. RCT later if needed

Question 44

if an avulsion took place less than 60 min ago and apex is open how do you treat?

Answer 44

1. clean with saline and antibiotics
2. reimplant and splint
3. follow vitality

Question 45

if avulsion took place over 1 hour ago and apex is still closed how do you treat?

Answer 45

1. soak in 2% NaF for 5-20 min