CSA endo labs week 1

Question 1

What does preoperative radiograph give?

Answer 1

o Existing restorations
o Remaining dentine
o Caries present
o Periodontal state/ligament
o State of apex: open/closed/resorbed
o Periapical pathology signs 
- Pulps chamber: size/position
o Canal: location/size/curve
o Obstructions
o Likely working length

Question 2

How to access cavity ?

Answer 2

• Can’t be too > large too destructive
• Can’t be too far subgingival >access is poor & cingulum damaged
• Can’t be too far incisal >poor appearance observed

Question 3

What happens if cavity too subgingival ?

Answer 3

Damages dentine in area provides tooth w/ stability

Question 4

How to access incisor and canine ?

Answer 4

• Remove roof of pulp chamber
• Straight line access
• Avoid cingulum & incisal edge
• Obtain good access for cavity > irrigants placed in

Question 5

the Steps for accessing cavity ?

Answer 5

• cut a small triangular shape into canal using a pear-shaped number 7
• then slow speed directly into pulp chamber & sudden drop into chamber
• use slow speed to gently pull back on pulp roof chamber, improving access
• Endo Z bur held straight to pulp chamber to achieve final outline

Question 6

What is Coronal flare?

Answer 6

• flare coronal using gates-Glidden burs
• start as crown to apical
• cut with in/out motion

Question 7

What sizes are used to coronal flare ?

Answer 7

• Size 4/3>only in orifice in a pecking motion

* 3,2,1 >Used in straight part of canal

Question 8

What do we check after coronal flare?

Answer 8

check patency (unobstructed) of canal to near working length

Question 9

Why is inter appointment dressing needed ?

Answer 9

root canals take so long

Question 10

How do we safely irrigate during inter appointment dressing ?

Answer 10

• Irrigate, short of estimated working length

Question 11

Non-setting Ca(OH)2 during inter appointment dressing ?

Answer 11

o Twist in with hand file – flutes push dressing to side of wall
o use very small needle and squirt in
o Continues to act for many days as strong antibacterial

Question 12

Whats between non setting CalcHydrox. and temp filling?

Answer 12

cotton wool spacer

Question 13

What should temporary filling material be like?

Answer 13

durable (about 3mm )

o Keeps non-setting calcium hydroxide and bacteria & tissue fluids out

Question 14

How long do we dress for in infected case?

Answer 14

1 week
oC avit > good seal but soft
o IRM >Leaky but antibacterial
o GIC >Good seal & durable