Surveying

Question 1

When do we consider altered path of insertion

Answer 1

When we have a minimum of two upper anteriors missing

• for retention if soft tissue undercut
• to get rid of teeth undercuts for aesthetics
• remove obstruction for placement (ease of insertion)

Question 2

What are the 3 undercut gages used for surveying a cast and what ally is each for?

Answer 2

0. 25 - cobalt chrome
1. 5 - gold
2. 75 - stainless steel

Question 3

How do you get the common path of displacement when surveying a cast?

Answer 3

Use a ruler on more anterior teeth to make occlusal plane parallel with survey table (back molars can be raised)

Question 4

What is it called when you mark the common path of displacement on a model while surveying

Answer 4

Tripoding

Question 5

What are the tripod lines marked with for common path of displacement and altered path of insertion?

Answer 5

Common - PD

Altered - PI

Question 6

What is the process of surveying a cast?

Answer 6

1. Attach to survey table and get common path of displacement with ruler
2. Tripod
3. Check saddle areas with analysing rod for soft and hard tissue undercuts
4. Then use graphite rod to mark these undercuts
   - (also draw like into sulcus from abutment tooth to show where denture will run until)
5. Use undercut gauge and pencil to mark