1. Today AM – Need Ney Surveyor PM - Clinic
Get Casts, Typodonts & Marking Sheets at front
Presentations and Videos
Survey Class I & II Casts (‘TYPO’)(w/o preps)
Tripod Casts
Get Mannikin Heads & Mounts ready for PM
PM - Clinic
Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched)
Formative
Marking sheets

2. Surveying, Path of Insertion, Guiding Planes

3. Definitions
Height of contour
Suprabulge
Undercut = Infrabulge

4. Rule: Retentive tip should usually be designed to be placed in the gingival 1/3

5. Path of Insertion Path that the prosthesis is Placed/removed
Usually a single path

6. Advantages of a Single Path of Insertion
Equalizes retention

7. Advantages of a Single Path of Insertion
Bracing and Cross-arch Stabilization

8. Advantages of a Single Path of Insertion
Minimizes torque on abutments

9. Advantages of a Single Path of Insertion
Allows removal without encountering interferences

10. Advantages of a Single Path of Insertion
Directs forces along long axes of teeth

11. Advantages of a Single Path of Insertion
Provides frictional retention

12. Selecting a Single Path of Insertion
Use a dental surveyor to
Select path
Prepare guiding planes

13. Parts of a Surveyor Surveying
VIDEOS:
Parts of a Surveyor Surveying

14. Guiding Plane Preparation
Where rigid components contact abutments
Proximal Plates
Bracing Arms
Rigid portions of Retentive Arms

15. Altering Path of Insertion
Proximal surfaces similar undercuts
Retentive areas similar undercuts

16. Selecting a Path of Insertion
Modify tilt if necessary
Soft tissue interferences

17. Selecting a Path of Insertion
Modify tilt if necessary
Esthetics

18. Once Path Selected Instructor: Approves path Demo:
Mark heights of contour - carbon marker
Tripod

19. Optimal Path of Insertion
Retentive undercuts equalized
Retentive arm has a different path of escapement than guiding plane, so it must flex during removal

20. Optimal Path of Insertion
Retentive undercuts equalized
Ideally, retentive arms should oppose each other on opposite sides of the arch

21. Optimal Path of Insertion
Minimize severe tooth & soft tissue interferences

22. Optimal Path of Insertion
Esthetics
Minimize display of clasps, metal components

23. Optimal Path of Insertion
Prepare Guiding Planes
Flat surfaces parallel to path of insertion
Control & limit movement of RPD
Initial contacts for RPD

24. Effectiveness of Guideplanes
Most effective when:
Parallel to each other
More than one common axial surface

25. Effectiveness of Guideplanes
Most effective when:
Directly opposing each other

26. Effectiveness of Guideplanes
Most effective when:
Prepared on several teeth
Cover a large surface area

27. Videos: Preparing Guiding Planes Assessing Guide Planes
Operator Positioning RPD Preps
(view yourself)

28. Assessing Guiding Planes
Proximal View
Carbon Markings
Facial View

29. Preparing Guiding Planes
Select path of insertion
Design Partial Denture *
Select number & position of guiding planes
Prepare guiding planes

30. Use Surveyor to Align Bur Intraorally
When Preparing Guide Planes
Cast should be on Surveyor Close to Operator to Compare Orientation of Analyzing Rod and Bur to the Tooth

31. FINGER REST!

32. Burs
8837K-014
Long Cylindrical Carbide or Diamond (8837K 014)

33. Guiding Plane Dimensions

34. Axial Surface Already Parallel to Path of Insertion
NO Preparation !

35. Polish Prepared Surfaces
Rubber wheels or points

36. Prepare Guiding Planes First

37. Effects of Guiding Planes On Retention & Stability
Maintains Retention

38. Effects of Guiding Planes On Retention & Stability
Minimizes Need for Retention

39. Effects of Guiding Planes On Retention & Stability
Stabilizing Teeth

40. Marking Sheets