EXTRA COR REST - Treatment Planning

Question 1

Give 4 reasons why crowns are used.

Answer 1

• restore severely broken down teeth
• protect remaining tooth tissue
• improve aesthetics - colour and shape
• may last longer than direct restoration

Question 2

2 reasons why crowns may be a burden to the patient.

Answer 2

financial cost
biological cost

Question 3

can crowns be used as part of a bridge? what is the terminology used?

Answer 3

yes

crown tooth = bridge abutment tooth
artificial tooth for the replacement = bridge pontic
the actual crown = retainer

Question 4

where can crowns be used?

Answer 4

• on broken down teeth
• as part of a bridge
• support partial dentures

Question 5

how can crowns be used to support dentures?

Answer 5

• can be indents for dentures to sit onto
• improve the retention

Question 6

what are the disadvantages of crowns?

Answer 6

• high biological cost
• time consuming - production, appointment time
• high financial cost
• difficult to achieve right aesthetic

Question 7

why is there biological cost with crowns/

Answer 7

have to remove more tooth tissue, which may be sound

• removal can be close to the pulp, possible exposure?

Question 8

what are the 3 different types of crowns?

Answer 8

FVC - full veneer crown
MCC - metal ceramic crown
ACC - all ceramic crown e.g. Emax Press

Question 9

when placing FVC, how much buccal margin prep, occlusal reduction and lingual margin prep do you need?

Answer 9

buccal - 0.5mm
occlusal - 1-1.5mm
lingual - 0.5mm

Question 10

when placing MCC, how much buccal margin prep, occlusal reduction and lingual margin prep do you need?

Answer 10

buccal - 1.2-1.5mm
occlusal- 1.5-2.5mm
lingual- 0.5mm

Question 11

when placing ACC, how much buccal margin prep, occlusal reduction and lingual margin prep do you need?

Answer 11

buccal - 1mm
occlusal - 1.5-2mm
lingual - 1mm

Question 12

what percent of crowned teeth are non-vital?

Answer 12

20%, 1/5

Question 13

what percent of crown teeth LOSE vitality and require RCT within 10 years after crowning?

Answer 13

8%

Question 14

with the types of crowns, order them with aesthetics, biological cost, strength and price

Answer 14

FVC - least aesthetic and least biological cost, cheapest
MCC - mid lol
ACC - most aesthetic

Question 15

FVC, which are cheaper?

Answer 15

non-precious metals are cheaper than gold alloy

Question 16

where do crowns fit into a treatment plan?

Answer 16

after initial therapy
after corrective therapy

in advanced treatment whe. considering aesthetics and replacing missing teeth

Question 17

what radiograph must be taken prior crown replacement and why?

Answer 17

peri-apical radiograph
- to consider the periapical health and any pathology
- if the root filling is adequate
- if there is good bone support

Question 18

what needs to be ensured about the tooth prior crown placement?

Answer 18

• treat existing caries
• manage perio disease
• RCT if necessary
• build up tooth with core material
  with amalgam, composite, NOT GIC
• isolate with rubber dam
• adjacent and opposing teeth need to be considered - occlusion, contact points