Surveying of cast for rpd

1. SURVEYING OF CAST FOR RPD
Dr Muhammad Shakeel Khawaja

2. DENTAL SURVEYOR
 An instrument used to measure relative
parallelism of 2 or more surfaces of a tooth
and other parts of the cast dental arch

3.  One of the main reasons for failure of
removable part dentures is non-use of
surveyor or improper use of surveyor

4. USES OF SURVEYOR
1. Determining parallelism of 2 or more
surfaces
2. Locating undercuts
3. Determining path of insertion
4. Planning out location of individual
component
5. Fabricating individual parts and/or complete
prosthesis

5. OBJECTIVES OF SURVEYING
1. To select the most suitable path of
placement
2. To permit measurement of retentive areas
and to identify the location of clasp terminals
3. To locate undesirable undercut areas that
will be crossed
4. To trim blockout material parallel to the path
of placement before duplication

6. TYPES OF SURVEYOR
1. Ney
2. Jelenko
3. Wills
4. Combination

8. DIFFERENCE IN TYPES
Ney Jelenko Will’s
Screw fixed surveying
arm
Spring mounted surveying
arm
Spring mounted
Fixed horizontal arm Swivel Hinged joint

9. PARTS OF A SURVEYOR
1. Platform
2. Vertical arm
3. Horizontal arm
4. Base
5. Table
6. Paralleling tools
7. Manderel

11. “TRIPODING”
 Recording relation of cast to surveyor:
 Placing 3 divergent points on soft tissue part
of cast that are not involved in framework

18.  Undercuts of 0.01 - 0.02 inches are sufficient
for retention
 Rarely 0.03”

23. CLASS ASSIGNMENT
• “Factors affecting path of insertion and
removal”
• To be submitted by Monday
• March 12th 2018