Treatment planning for fixed pros

Question 1

Fixed prosthodontics - definition

Answer 1

area of prosthodontics focused on permanently attached dental prosthesis
- also referred to as indirect restorations

Question 2

Give the principles of tooth preparation

Answer 2

• preservation of tooth structure
• retention and resistance
• structural durability
• marginal integrity
• preservation of the periodontium
• aesthetic considerations

Question 3

Retention - define in relation to fixed pros

Answer 3

prevents removal of restoration along path of insertion or the long axis of the tooth preparation

Question 4

resistance - define in relation to fixed pros

Answer 4

prevents dislodgement of restoration by forces directed in apical or oblique direction and prevents any movement of the restoration under occlusal forces

Question 5

How can retention by improved

Answer 5

limiting number of paths of insertion

Question 6

What is meant by “structural durability”?

Answer 6

the restoration must contain a bulk of material that is suitable to withstanding occlusal forces

Question 7

how is structural durability achieved?

Answer 7

occlusal reduction
functional cusp bevel
axial reduction

Question 8

how is marginal integrity achieved?

Answer 8

finish line configurations
- knife edge
- bevel
- chamfer
- shoulder
- bevelled shoulder

Question 9

How is the periodontium preserved during a tooth preparation?

Answer 9

the margins are/should be
- smooth and fully exposed to cleaning action
- placed where dentist can finish them and patient can clean them
- placed supra gingival or at gingival margin whenever possible