Surveyor and Surveying

Question 1

Definition of surveyor, surveying and surveying line

Answer 1

Surveyor: a parallel device used in constructing a dental prosthesis to locate and delineate the contour and relate position of abutment teeth and associate structures.

Surveying: an analysis and comparison of prominence of intra oral of the contour associated with the dental prosthesis

Surveying line: a line produce on a cast by surveyor marking the greatest prominence of contour.

Question 2

Parts of surveyor

Answer 2

1. Platforms
2. Vertical arm
3. Horizontal arm
4. Surveying arm
5. Locking device
6. Surveying instrument
7. Cast holder

Question 3

Tools of surveyor

Answer 3

1. Analyzing rod- to analyse the cast to establish the path of insertion.
2. Carbon marker-used for drawing the surveying line around all teeth involved in clasp design.
3. Undercut gauges - used to measure the undercut of the cast

McCracken-0.01,0.02,0.03

4. Wax knife- used in the late stage of RPD construction to eliminate the undesirable undercut with wax on the cast before frame work is done.

Question 4

Uses of dental surveyor

Answer 4

1. For surveying the diagnostic cast
   - to determine most desirable path of placement and removal of removal partial denture

• to identify proximal tooth surface that are need to be parallel so they act as a guiding planes during placement and removal
• to measure and locate areas of teeth that may be used for retention

Question 5

Objective sof surveying

Answer 5

1. To design RPD
2. To determine path of insertion of the prosthesis
3. To mark the undesirable undercut into which prosthesis should not extend

Question 6

4 factors must be consider before path of insertion

Answer 6

1. Retentive undercut
2. Interference
3. Esthetics
4. Guiding planes