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Today

Today. AM – Need Ney Surveyor Pick up Marking Sheets at front Should have Casts, Typodonts, etc Presentations and Videos Survey Class I & II Casts (‘TYPO’)(w/o preps) Tripod Casts PM – Sim Lab Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched) Formative

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Today

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  1. Today • AM – Need Ney Surveyor • Pick up Marking Sheets at front • Should have Casts, Typodonts, etc • Presentations and Videos • Survey Class I & II Casts (‘TYPO’)(w/o preps) • Tripod Casts • PM – Sim Lab • Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched) • Formative • Marking sheets

  2. Surveying, Path of Insertion, Guiding Planes

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

  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. VIDEOS: Parts of a SurveyorSurveying

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

  15. Altering Path of Insertion • Initial goal to select path with similar undercuts on • Proximal surfaces • Retentive areas

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

  17. Selecting a Path of Insertion • Modify tilt if necessary • Esthetics • Minimize display of clasps, metal components

  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 • Prepare Guiding Planes • Flat surfaces parallel to path of insertion • Control & limit movement of RPD • Initial contacts for RPD

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

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

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

  26. Videos: Preparing Guiding Planes Assessing Guide Planes

  27. Assessing Guiding Planes Proximal View Carbon Markings Facial View

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

  29. 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

  30. FINGER REST!

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

  32. Guiding Plane Dimensions

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

  34. Polish Prepared Surfaces • Rubber wheels or points

  35. Prepare Guiding Planes First

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

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

  38. Effects of Guiding Planes On Retention & Stability • Stabilizing Teeth

  39. Marking Sheets

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