Surveying

Question 1

why is surveying carried out

Answer 1

to highlight undercut areas that can be utilised by clasps for retention and and undercuts which need to be eliminated on anterior saddles

Question 2

what are guide planes?

Answer 2

two or more parallel tooth surfaces which determine the path of insertion

Question 3

what is the path of insertion

Answer 3

path followed by denture from first contact with teeth/tissue until it fully seats

Question 4

what is the path of displacement

Answer 4

any path in which the denture can be displaced

Question 5

what is the common path of displacement

Answer 5

taken at 90 degrees to the occlusal plane

Question 6

what is the first step in surveying

Answer 6

position the cast on the surveyor table and orientate to the common path of displacement (with ruler)

Question 7

what is the second step in surveying

Answer 7

tripod cast as common path of displacement

Question 8

once the tripod lines are in place what do you do next?

Answer 8

survey the cast with the analysing rod to look for undercuts on abutment teeth and soft tissues

Question 9

what do you do after using the analysing rod

Answer 9

mark upper and lower survey lines on abutment teeth and associated soft tissues with graphite marker

Question 10

what does tripoding record

Answer 10

the orientation of the cast whether that be common path or altered path

Question 11

what tools does the surveyor have?

Answer 11

chuck (where rods sit), analysing rod, graphite markers, 3 undercut gauges, red marker