Anterior temporary crown

Question 1

What is a temporary crown?

Answer 1

Made to last and function for only a short term e.g. while permanent crown is made in the dental lab

Question 2

What is a provisional crown?

Answer 2

Made to last for longer period while other assessment of teeth is carried out e.g. while periodontal treatment is completed (e.g. to allow the outcome of endodontic or periodontal treatment to be evaluated)

Question 3

What are the requirements of a temporary restoration?

Answer 3

BMA
Biological
Mechanical
Aesthetic

Question 4

What are the Biological requirements of a temporary restoration?

Answer 4

• Protective prepared dentine
• Prevent gingival tissue from overgrowing preparation margins
• Prevent over-eruption from over-eruption or tilting of prepared tooth thereby maintaining contact points and occlusion
• Protect periodontal regions (exact marginal fit, polish ability and biocompatibility) to rule out consequential damage to the gingiva and bone

Question 5

What are the mechanical requirements of a temporary restoration?

Answer 5

Strong enough to withstand forces of occlusion and mastication without fracturing (improves quality of life for the patient)

Question 6

What are the aesthetic requirements of a temporary restoration?

Answer 6

• Provide reasonable shade match to remaining natural dentition
• Surface topography that is similar to remaining natural teeth

Question 7

What should you check on the prepared tooth?

Answer 7

• make sure no sharp angles
• check intercuspal clearance is sufficient for the placement of the temporary crown
• the cervical margins to check no undercuts

Question 8

What type of material is Trim?

Answer 8

High molecular weight resin
= Poly Iso-butyl methacrylate
= lower exotherm and polymerisation shrinkage compared to methyl methacrylate

Question 9

What stage does the trim have to reach before the temporary crown can be removed?

Answer 9

Snap stage

Question 10

What happens if the temporary crown is removed prior to the snap stage?

Answer 10

Distortion

Question 11

What happens if the temporary crown is left for longer than the snap stage?

Answer 11

Full polymerisation = difficult to remove the crown

Question 12

What is trim used to do?

Answer 12

Reline the temporary crown

Question 13

What type of material is Temp Bond?

Answer 13

Luting zinc oxide and eugenol cement

Question 14

What is the main advantage of using Temp bond as the cement?

Answer 14

Removes cleanly from the preparation when the temporary crown is removed