Final Flashcards
what irrigation do bugs hate the worst?
NaOCl
what two anatomical pathways of communication exist between dental pulp and periradicular tissues?
Apical Foramen
lateral furcation canals
what pathways exist for root canal infection?
- dentinal tubules
- direct exposure
- biofilm
- anachoresis
when would you see a J shaped lesion?
vertical root fracture(narrow probing depth, may appear similar to lesion of pulpal origin)
If you have multiple wide probing depths you have a perio, endo or cracked tooth problem?
Perio
If you have a single narrow probing depth that may extend to the apex you have a perio, endo, or cracked tooth problem?
Endo
If you have an isolated, narrow probing depth you have a perio, endo, or cracked tooth problem?
Cracked tooth
in apical constriction this point is the narrowest point
minor apical diameter
after the apical constriction this point flares outward
major apical diameter
T or F: apical constriction is clinically evident in all teeth
False
apical constriction can be defined as
the narrowest part of the canal formed by Cemento Dentinal Junction
- junction of pulp and periodontium
- best place to end root canal
what 3 things can happen after pulp trauma?
- complete recovery
- pulp tissue replaced with calcified tissue
- pulp necrosis(can lead to external resorption sometimes internal resorption)
what type of trauma has no displacement, no mobility, percussion sensitive
concussion
no treatment
what type of trauma has no displacement, mobile, percussion sensitive
subluxation
no treatment
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?
Intrusive trauma
Tx: RCT
what type of trauma has coronal displacement,is mobile,x ray shows displacement, pulp test–>nonvital
Extrusion
tx reposition splint 2-4 weeks
RCT later if needed
what type of trauma has MDBL displacement
lateral
tx: reposition, splint, RCT later if needed
what type of trauma has complete displacement from socket
Avulsion
tx: immediate reimplantation and splint
which teeth have 1 canal generally?
maxillary incisors and canines
how many canals do maxillary 1st premolars have
1 or 2
how many canals do maxillary 2nd premolars have
generally 1
how many canals do maxillary molars have?
3-4
*MB root has 1-2
other roots only have 1
how many canals do mandibular incisors have?
2
how many canals do mandibular canines have
1
how many canals do mandibular premolars have?
1-2
how many canals does the mandibular 1st molar have
4
how many canals does mandibular 2nd molar have
3
define ledge formation
when working length can no longer be negotiated and original patency is lost
what 4 things cause ledge formation
- inadequate straight line access
- inadequate irrigation or lube
- excessive enlargement of curved canal with files
- packing debris in apical portion of canal
what should you do to fix a ledge
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
if an instrument separates in the canal what should you do
have an endodontist retrieve it
This works to remove inorganic components(hard tissue-dentin and calcifications) leaves organic tissue intact
EDTA
-actively removes smear layer
this irrigation solution dissolves vital and necrotic tissue including the smear layer
sodium hypochlorite
this irrigation solution has broad-spectrum antimicrobial sustained action
doesn’t remove smear layer
chlorohexidine
you cannot use this irrigant with NaOCL because it will form precipitate
chlorohexidine
this irritant demineralizes the dentin wall, smear layer and dentin tubules
EDTA
if the item moves the same way as you moved the sensor its on the _______
LINGUAL
if the item moves the opposite way from which you move the radiograph it is on the____
Buccal
when would you do incision and drainage?
- necrotic pulp with flucuate swelling and no drainage
- necrotic pulp with diffuse swelling and no drainage
- possibly in acute apical abscess
- fistulous tract/abscess
when doing an incision and drainage where do you cut to?
deep incision to base of alveolar bone, dissect what you need then place drain
what 2 situations could you try regenerative endodontics?
- pulp necrosis with immature root apex
2. pulp space not to be used in restoration(ex:post)
what 2 things are considered when treating avulsions?
- time out of mouth
2. mature/immature apex
if an avulsion took place less than 60 min ago and apex is closed how do you treat?
- irrigate socket
- reimplant and splint 2 weeks
- RCT later if needed
if an avulsion took place less than 60 min ago and apex is open how do you treat?
- clean with saline and antibiotics
- reimplant and splint
- follow vitality
if avulsion took place over 1 hour ago and apex is still closed how do you treat?
- soak in 2% NaF for 5-20 min
