04. Surveying.ppt

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  • i am working as lecture in Anjuman college of engg.can you mail me your ppt on levelling & contouring ? sir, it will be help full to me.mail me at ashwiniisawaitul@ymail.com. thank you sir.
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04. Surveying.ppt

  1. 1. Today <ul><li>AM - Seminar - 3157 </li></ul><ul><ul><li>Get Casts from Marjorie </li></ul></ul><ul><ul><li>Survey Class I & II Casts (no preps) </li></ul></ul><ul><ul><li>Tripod Casts </li></ul></ul><ul><ul><li>Get Heads & Mounts ready for PM </li></ul></ul><ul><li>PM - Clinic </li></ul><ul><ul><li>Prepare guiding planes on Class I & II Typodonts (last sheet Course Sched) </li></ul></ul><ul><ul><li>Formative </li></ul></ul><ul><ul><li>Marking sheets </li></ul></ul><ul><ul><li>Diagnostic Casts Mark Sheets - Hand in </li></ul></ul>
  2. 2. Surveying, Path of Insertion, Guiding Planes
  3. 3. Definitions <ul><li>Height of contour </li></ul><ul><li>Undercut = Infrabulge </li></ul><ul><li>Suprabulge </li></ul>
  4. 4. Definitions <ul><li>Height of contour </li></ul><ul><li>Undercut = Infrabulge </li></ul><ul><li>Suprabulge </li></ul>
  5. 5. Rule: Retentive tip should usually be designed to be placed in the gingival 1/3
  6. 6. Path of Insertion <ul><li>Path that the prosthesis is </li></ul><ul><ul><li>Placed/removed </li></ul></ul><ul><ul><li>Usually a single path </li></ul></ul>
  7. 7. Advantages of a Single Path of Insertion <ul><li>Equalizes retention </li></ul>
  8. 8. Advantages of a Single Path of Insertion <ul><li>Bracing and Cross-arch Stabilization </li></ul>
  9. 9. Advantages of a Single Path of Insertion <ul><li>Minimizes torque on abutments </li></ul>
  10. 10. Advantages of a Single Path of Insertion <ul><li>Allows removal without encountering interferences </li></ul>
  11. 11. Advantages of a Single Path of Insertion <ul><li>Directs forces along long axes of teeth </li></ul>
  12. 12. Advantages of a Single Path of Insertion <ul><li>Provides frictional retention </li></ul>
  13. 13. Selecting a Single Path of Insertion <ul><li>Use a dental surveyor to </li></ul><ul><ul><li>Select path </li></ul></ul><ul><ul><li>Prepare guiding planes </li></ul></ul>
  14. 14. Guiding Plane Preparation <ul><li>Where rigid components contact abutments </li></ul><ul><ul><li>Proximal Plates </li></ul></ul><ul><ul><li>Bracing Arms </li></ul></ul><ul><ul><li>Rigid portions of Retentive Arms </li></ul></ul>
  15. 15. Other Uses of a Surveyor <ul><li>Blocking out undesirable undercuts </li></ul><ul><ul><li>Ensures the framework is not cast in an undercut </li></ul></ul>
  16. 16. Parts of a Surveyor <ul><li>Surveying Table </li></ul>
  17. 17. Parts of a Surveyor <ul><li>Surveying Arm </li></ul>
  18. 18. Parts of a Surveyor <ul><li>Surveying Tools </li></ul><ul><ul><li>Analyzing Rod </li></ul></ul>
  19. 19. Parts of a Surveyor <ul><li>Surveying Tools </li></ul><ul><ul><li>Carbon Markers </li></ul></ul>
  20. 20. Parts of a Surveyor <ul><li>Surveying Tools </li></ul><ul><ul><li>Undercut Gauges </li></ul></ul>. 01” . 03” . 02”
  21. 21. Undercut Gauges
  22. 22. Parts of a Surveyor <ul><li>Surveying Tools </li></ul><ul><ul><li>Wax Trimmer </li></ul></ul>
  23. 23. Selecting a Path of Insertion <ul><li>Orient cast relatively horizontal </li></ul><ul><ul><li>Final tilt rarely more than 10° from horizontal </li></ul></ul>
  24. 24. Selecting a Path of Insertion <ul><li>Place analyzing rod against abutments </li></ul><ul><ul><li>Contact point is Height of Contour </li></ul></ul><ul><ul><ul><li>Below is infrabulge </li></ul></ul></ul><ul><ul><ul><li>Above is suprabulge </li></ul></ul></ul>
  25. 25. Selecting a Path of Insertion <ul><li>Tilt cast to obtain maximum parallelism </li></ul><ul><ul><li>Heights of contour are at relatively same position occluso-gingivally </li></ul></ul><ul><ul><li>Equal amounts of undercut </li></ul></ul>
  26. 26. Altering Path of Insertion <ul><li>Proximal surfaces similar undercuts </li></ul><ul><li>Retentive areas similar undercuts </li></ul>
  27. 27. Selecting a Path of Insertion <ul><li>Modify tilt if necessary </li></ul><ul><ul><li>Soft tissue interferences </li></ul></ul>
  28. 28. Selecting a Path of Insertion <ul><li>Modify tilt if necessary </li></ul><ul><ul><li>Esthetics </li></ul></ul>
  29. 29. Once Path Selected <ul><li>Instructor: </li></ul><ul><ul><li>Approves path </li></ul></ul><ul><ul><li>Demo: </li></ul></ul><ul><ul><ul><li>Mark heights of contour with carbon marker </li></ul></ul></ul><ul><ul><ul><li>Tripod </li></ul></ul></ul>
  30. 30. Selecting a Path of Insertion <ul><li>Lock cast position & tripod </li></ul>
  31. 31. Tripoding
  32. 32. Optimal Path of Insertion <ul><li>Retentive undercuts equalized </li></ul><ul><ul><li>Retentive arm has a different path of escapement than guiding plane, so it must flex during removal </li></ul></ul>
  33. 33. Optimal Path of Insertion <ul><li>Retentive undercuts equalized </li></ul><ul><ul><li>Ideally, retentive arms should oppose each other on opposite sides of the arch </li></ul></ul>
  34. 34. Optimal Path of Insertion <ul><li>Minimize severe tooth & soft tissue interferences </li></ul>
  35. 35. Optimal Path of Insertion <ul><li>Esthetics </li></ul><ul><ul><li>Minimize display of clasps, metal components </li></ul></ul>
  36. 36. Optimal Path of Insertion <ul><li>Prepare Guiding Planes </li></ul><ul><ul><li>Flat surfaces parallel to path of insertion </li></ul></ul><ul><ul><li>Control & limit movement of RPD </li></ul></ul><ul><ul><li>Initial contacts for RPD </li></ul></ul>
  37. 37. Guiding Planes <ul><li>Stabilization </li></ul>
  38. 38. Effectiveness of Guideplanes <ul><li>Most effective when: </li></ul><ul><ul><li>Parallel to each other </li></ul></ul><ul><ul><li>More than one common axial surface </li></ul></ul>
  39. 39. Effectiveness of Guideplanes <ul><li>Most effective when: </li></ul><ul><ul><li>Directly opposing each other </li></ul></ul>
  40. 40. Effectiveness of Guideplanes <ul><li>Most effective when: </li></ul><ul><ul><li>Prepared on several teeth </li></ul></ul><ul><ul><li>Cover a large surface area </li></ul></ul>
  41. 41. Assessing Guiding Planes Proximal View Facial View Carbon Markings
  42. 42. Preparing Guiding Planes <ul><li>Select path of insertion </li></ul><ul><li>Design Partial Denture * </li></ul><ul><li>Select number & position of guiding planes </li></ul><ul><li>Prepare guiding planes </li></ul>
  43. 43. Use Surveyor to Align Bur Intraorally
  44. 44. FINGER REST!
  45. 45. Burs <ul><li>Long Cylindrical Carbide or Diamond (8837K 014) </li></ul>8837K-014
  46. 46. Guiding Plane Dimensions
  47. 47. Axial Surface Already Parallel to Path of Insertion <ul><li>NO Preparation ! </li></ul>
  48. 48. Polish Prepared Surfaces <ul><li>Rubber wheels or points </li></ul>
  49. 49. Prepare Guiding Planes First
  50. 50. Effects of Guiding Planes On Retention & Stability <ul><li>Maintains Retention </li></ul>
  51. 51. Effects of Guiding Planes On Retention & Stability <ul><li>Minimizes Need for Retention </li></ul>
  52. 52. Effects of Guiding Planes On Retention & Stability <ul><li>Stabilizing Teeth </li></ul>
  53. 53. Other Alterations of Axial Contours <ul><li>Lowering Heights of Contour </li></ul><ul><ul><li>Rigid elements contacting abutments </li></ul></ul><ul><ul><li>Improve esthetics </li></ul></ul><ul><ul><li>Prepare guiding planes - most efficient method to lower </li></ul></ul>
  54. 54. Other Alterations of Axial Contours <ul><li>Raising Heights of Contour </li></ul><ul><ul><li>Insufficient retention in gingival 1/3 (at least 1mm from gingiva) </li></ul></ul><ul><ul><li>Prepare undercut </li></ul></ul><ul><ul><li>Add resin above to create undercut </li></ul></ul>
  55. 55. Preparing Retention <ul><li>Axial surface must be close to parallel the path of insertion </li></ul>
  56. 56. Retentive Preparation Shape <ul><li>Follows the path of designed retentive tip </li></ul>
  57. 57. Creating Undercuts with Bonded Resins <ul><li>Axial surface must be close to parallel the path of insertion </li></ul>
  58. 58. Summary of Abutment Modifications <ul><li>After RPD Designed </li></ul><ul><ul><li>Guideplanes </li></ul></ul><ul><ul><li>Lower heights of contour to eliminate interferences & improve esthetics </li></ul></ul><ul><ul><li>Create undercuts if absolutely necessary (raising heights of contour) </li></ul></ul><ul><ul><li>Rest seat preparation </li></ul></ul>

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