Temporisation

Question 1

why is temporaisation sometimes a needed step?

Answer 1

1. Endodontic procedures are time consuming
   and often cannot be completed in one visit
2. Having disinfected the canals we require a
   temporary restoration which will maintain
   this clean environment
3. The mouth is full of bacteria so this
   restoration must seal effectively

Question 2

what is the intra-canal medicament used for temporisation during RCT?

Answer 2

non setting calcium hydroxide

Question 3

why is Non Setting Calcium Hydroxide used for temporisation?

Answer 3

1) High pH (12.5) – Antibacterial
and stimulates healing of boney lesions
2) Radiopaque (eg Barium Sulphate added)

Question 4

why is it risky that Non Setting Calcium Hydroxide has a high pH (although it is generally an advantage)?

Answer 4

• if it goes beyond the apex
• can cause necrosis to tissues in PDL

Question 5

in what form does Non Setting Calcium Hydroxide come in in clinic?

Answer 5

syringes already mixed

Question 6

what is the radioopaque material called that is added to Non Setting Calcium Hydroxide?

Answer 6

Barium Sulphate

Question 7

what is the advantage of adding barium sulphate to Non Setting Calcium Hydroxide?

Answer 7

radioopaque - enables us to see the filling of the calcium hydroxide on X-ray

Question 8

what is the safest way to place the temporisation material (Non Setting Calcium Hydroxide) into a canal?

Answer 8

• apply the non-setting calcium hydroxide onto the orifice of the canal and then try to spread it inside canal with paperpoints/ file/ spreader inside the canal

Question 9

what is the alternative way (NOT so safe) way to place the temporisation material (Non Setting Calcium Hydroxide) into a canal?

Answer 9

• place it in with a syringe

Question 10

why is it risky/ unsafe to put the temporisation material into the canal with a syringe?

Answer 10

worried about extruding it through the apex

Question 11

why is it important that the Calcium Hydroxide used for temporisation is non-setting?

Answer 11

needs to be removed later on to continue endo tx

Question 12

during temporisation, why do we need to place a cotton wool pledget on top of the orifice?

Answer 12

Prevents temporary restorative material from lodging in canal orifice, which would make it difficult to remove without damaging the tooth

Pledget can be soaked in Ca(OH)2 to enhance antibacterial effect

Question 13

What are the size criteria of the cotton wool pledget placed in the orifice during temporisation?

Answer 13

• needs to be large enough to not get into the canal and gets dislodged in
• but not big enough that the temp filling placed on top is with a gap because of it

Question 14

During temporisation of RCT, what does the pledget get soaked in to enhance the antibacterial effect?

Answer 14

Pledget can be soaked in Ca(OH)2 to enhance antibacterial effect

Question 15

During temporisation during RCT, after the cotton woll pledget is places over the orifice, what is placed on top?

Answer 15

temp filling

Question 16

what is the common material used for the temp filling during temporisation?

Answer 16

ChemFIll Rock (Reinforced glass ionomer cement)

Question 17

What are the properties of ChemFIll Rock (Reinforced glass ionomer cement) that make it good for a temporary filling during temporisation of RCT?

Answer 17

• Self curing (NOT LIGHT CURED!!!) so can be placed in one increment
• Sets quickly so work fast
• Packable
• Strong
• Good radiopacity, and contrast white shade available for easy removal

Question 18

list the steps in Chemfil Rock Application when doing the temp filling during temporisation of RCT

Answer 18

1. Activate for 2s
2. Mix in amlagamator for 15s
3. Place in ‘gun’ and apply to cavity
4. Pack and shape, working time 1’30”
5. Setting time 6 minutes

Question 19

Inter-appointment dressing summary (temporisation)