C&b+pk thomas+technique+ver2

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C&b+pk thomas+technique+ver2

  1. 1. P.K.Thomas Waxing Technique a ‘drop wax’ or ‘wax added’ technique 1Construct Crown & Bridge Structures 510B Ver2
  2. 2. Why put all those grooves on the occlusalsurface??Why not put simple inclined planes on a flattable?? 2
  3. 3. IntroductionThere are many positive and negatives features on atooth eg, cusp tips and ridges.The ridges, when properly formed, are convex in alldirections. Buccolingually and mesiodistally. This is toprovide point contacts with the opposing cusps.The convex surfaces of ridges produce a distributedcontact pattern with small contacts. In this wayocclusal forces are distributed over a wide area of theocclusal surface. 3
  4. 4. The grooves perform an important function.If they are adequate in width and depth andtraverse the occlusal surface in the properdirection, they will permit the smoothunimpeded passage of the opposing cusps inexcursive movements. 4
  5. 5. A ‘wax adding’ exercise 5
  6. 6. The ‘cusp cone’ and marginal ridges 6
  7. 7. Supplementary or axial ridges 7
  8. 8. Filling in axial contours 8
  9. 9. Making triangular ridges 9
  10. 10. 10
  11. 11. Cusp cones on Mandibular 2nd Premolar and 1st molar 11
  12. 12. Occlusal contacts on mesial marginal ridges 12
  13. 13. Occlusal contacts on distal marginal ridges 13
  14. 14. Occlusal contacts on buccal Triangular ridges 14
  15. 15. TripodisationOcclusal contacts on lingual triangular ridges or 3 point contact 15
  16. 16. Inter-occlusal contacts 16
  17. 17. The functional cusps (lingual of themaxillary and buccal of the mandibular) arethe cusps to locate first. They should bepositioned so they will contact theappropriate fossa or marginal ridge of theopposing tooth. 17
  18. 18. The maxillary buccal nonfunctional cuspsneed to be short enough to miss contacting themandibular buccal ‘functional’ cusps duringexcursions.The mandibular lingual nonfunctional cuspsneed to be slightly shorter than the buccal andplaced as far to the lingual. 18

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