Removing FPDs

Question 1

What are the 3 problems that could cause failures

Answer 1

1) Biological

2) Mechanical

3) Aesthetics

Question 2

Does poor margins which lead to caries require removal of bridges?

Answer 2

Pain -> need to remove and wear denture
Deep caries -> sub gingival margins -> might not capture better crown margins -> better to keep
Patient -> if patient wants to keep
Age -> old patient can just use until it fails
Time -> how long has it been

Question 3

Other possible reason for removal due to operator mistake

Answer 3

• incomplete seating of prosthesis during cementation

Question 4

Considerations prior to crown and bridge disassembly

Answer 4

1) medical contra-indications
2) restorability of abutments
3) status of underlying core structure
4) periodontal status
5) intra-oral access
6) type of cement
7) type of prosthesis material
- EMAX/zirconia -> hard to differentiate between real tooth and crown
- full metal -> very hard to cut through

Question 5

What must you inform patients prior to crown/bridge removal

Answer 5

• reasons for removal
• possible complications
• treatment options
• make provisional just in case!! Max 2

Question 6

When to do destructive treatment (remove!)

Answer 6

• prosthesis on perio teeth
• when prosthesis disassembly fails
• prosthesis ca be sectioned

Question 7

Conservative diassembly

Answer 7

• ## percussion or traction type of force is applied to attempt to break cement seal