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Today

Today. AM - Seminar - 3157 Get Casts from Marjorie Survey Class I & II Casts (no preps) Tripod Casts Get Heads & Mounts ready for PM PM - Clinic Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched) Formative Marking sheets Diagnostic Casts Mark Sheets - Hand in.

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Today

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  1. Today • AM - Seminar - 3157 • Get Casts from Marjorie • Survey Class I & II Casts (no preps) • Tripod Casts • Get Heads & Mounts ready for PM • PM - Clinic • Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched) • Formative • Marking sheets • Diagnostic Casts Mark Sheets - Hand in

  2. Surveying, Path of Insertion, Guiding Planes

  3. Undercut = Infrabulge • Suprabulge Definitions • Height of contour

  4. Definitions • Height of contour • Undercut = Infrabulge • Suprabulge

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

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

  7. Advantages of a Single Path of Insertion • Equalizes retention

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

  9. Advantages of a Single Path of Insertion • Minimizes torque on abutments

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

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

  12. Advantages of a Single Path of Insertion • Provides frictional retention

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

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

  15. Other Uses of a Surveyor • Blocking out undesirable undercuts • Ensures the framework is not cast in an undercut

  16. Parts of a Surveyor • Surveying Table

  17. Parts of a Surveyor • Surveying Arm

  18. Parts of a Surveyor • Surveying Tools • Analyzing Rod

  19. Parts of a Surveyor • Surveying Tools • Carbon Markers

  20. . 01” . 02” . 03” Parts of a Surveyor • Surveying Tools • Undercut Gauges

  21. Undercut Gauges

  22. Parts of a Surveyor • Surveying Tools • Wax Trimmer

  23. Selecting a Path of Insertion • Orient cast relatively horizontal • Final tilt rarely more than 10° from horizontal

  24. Selecting a Path of Insertion • Place analyzing rod against abutments • Contact point is Height of Contour • Below is infrabulge • Above is suprabulge

  25. Selecting a Path of Insertion • Tilt cast to obtain maximum parallelism • Heights of contour are at relatively same position occluso-gingivally • Equal amounts of undercut

  26. Altering Path of Insertion • Proximal surfaces similar undercuts • Retentive areas similar undercuts

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

  28. Selecting a Path of Insertion • Modify tilt if necessary • Esthetics

  29. Once Path Selected • Instructor: • Approves path • Demo: • Mark heights of contour with carbon marker • Tripod

  30. Selecting a Path of Insertion • Lock cast position & tripod

  31. Tripoding

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

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

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

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

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

  37. Guiding Planes • Stabilization

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

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

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

  41. Assessing Guiding Planes Proximal View Carbon Markings Facial View

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

  43. Use Surveyor to Align Bur Intraorally

  44. FINGER REST!

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

  46. Guiding Plane Dimensions

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

  48. Polish Prepared Surfaces • Rubber wheels or points

  49. Prepare Guiding Planes First

  50. Effects of Guiding Planes On Retention & Stability • Maintains Retention

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