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BDS4 Endo > Basics > Flashcards

Basics Flashcards

1
Q

what teeth most commonly have 1 canal

A

maxillary - 1,2,3,5
mandibular - 1,2,3,4,5

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2
Q

what teeth most commonly have 2 canals

A

maxillary 4

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3
Q

what teeth most commonly have 3 canals

A

maxillary 7
mandibular 6,7

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4
Q

what teeth most commonly have 4 canals

A

maxillary 6

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5
Q

name 2 bacteria associated with endodontic infections

A

porphyromonas endodontalis
fuseobacterium nucleatum

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6
Q

what are the 2 main objectives of a RCT

A

remove canal contents
eliminate infection

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7
Q

contraindication to RCT

A

MI within last 6 months
1st trimester pregnancy - emergencies only

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8
Q

name 3 functions of the pulp

A

sensory - temp, pressure, pain
protective - tertiary dentine formation
formative - secondary dentine formation

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9
Q

when are thermal and electric sensibility tests useless

A

full coverage restorations e.g crown

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10
Q

objectives of access cavity preparation

A
  • de-roof entirety of pulp chamber
  • smooth walls with no overhangs
  • straight line access for instruments
  • visualisation of orifices
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11
Q

3 design objectives for root canal preparation

A

continuously tapering funnel shape
maintain apical foreamen in original position
keep apical opening as small as possible

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12
Q

why do early flaring of coronal portion

A
  • improved straight line access
  • avoids hydrostatic pressure in canal
  • early removal of heavily contaminated content
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13
Q

breifly discuss the modified double flare technique

A

1 - enlarge/flare apical portion (gates glidden)
2 - navigate apical portion and determine CWL
3 - flare apical portion via step back technique

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14
Q

briefly describe canal preparation using reciproc

A
  1. pecking motion, 3 pecks at a time until 2/3 EWL
  2. electronic apex locator
  3. prepare to CWL
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15
Q

minimum size of apical preparation

A

ISO 25

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16
Q

once preparation is complete what is the final irrigation process

A

1 -30ml NaOCl and mechanical dynamic irrigation
2 - 1min 17% EDTA rinse
3 - penultimate NaOCl rinse
dry with paper points

17
Q

K - files
- material
- cross section
- taper

A

stainless steel
square cross section
2% taper

(size = diameter at 1st rake angle)

18
Q

what needle is irrigation done with

A

27 gauge endodontic tipped needle

19
Q

percentages of NaOCl and EDTA

A

Na - 3%
EDTA 17%

BDS4 Endo (5 decks)

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