2. PPT developed by Dr. Steve Selwitz
RSD 812
: #30 Full Crown Wax Up
PPT developed by Dr. Steve Selwitz

3. Locate and mark the reference contact point that will hold shim stock tightly.

5. Know the Goal!

6. Use your Knowledge of dental Anatomy and Morphology….

7. Mark areas of contact on the maxillary cast
Mark areas of contact on the maxillary cast. Red dots are the contacts from the centric cusps of #30. Blue dots are the centric cusps of #3. You should have a minimum of six contacts on your wax pattern for #30.

8. Use your Knowledge of dental Anatomy and Morphology….

9. Mesiobuccal cusp of #30 contacts here
Contacts central fossa #30- flat area or tripod
Distobuccal cusp of #30 tripods here
Contacts distal fossa or marginal ridge of #30

10. Use your Knowledge of dental Anatomy and Morphology….

11. Apply one coat of Slaycris die lubricant on the occlusal surfaces of the opposing teeth

12. Lightly mark the margin
Use wax pencil, no graphite
Contrast: blue pencil for red wax & vice versa
Hold sharpened pencil parallel to die, lightly touch and mark margin
Do not mark margins on clinical cases! UKCD

14. Begin waxing by applying a thin layer (↓1 MM) to the external line angles of the occlusal surface. Then flow wax onto the occlusal surface, melt each addition into the previously added wax.

15. Set yourself up to work easily
Set yourself up to work easily. Rest your hands on the bench-top when possible. Keep a small work triangle.

16. Wax the axial surfaces from the occlusal downward toward the finish line. Again, melt each addition into the previously applied wax.

17. Add a slight excess of wax around the finish line
Add a slight excess of wax around the finish line. Seal the margin by allowing a small amount of wax to flow over the finish line.

18. 1.) Melt the wax well to seal the margin.
Then…
2.) Use the Hollenback carver to remove the excess wax. Keep the carver in contact with the die & properly aligned.

19. Make sure that you have trimmed back exactly to the finish line
Make sure that you have trimmed back exactly to the finish line. You should see a very distinct, smooth junction of wax and stone. Any irregular area usually indicates that there is still wax over the finish line.

21. Goal
Small additions of wax slightly past the finish line will secure the pattern.

22. Seat the die on the cast, but do not force it
Seat the die on the cast, but do not force it. If the proximal surfaces bind, remove the die and carve off some of the wax. Continue until the die seats easily.

23. Close the articulator gently
Close the articulator gently. Verify that no wax on #30 is touching the opposing tooth and that the reference contact still holds shim stock.

24. Proximal Contacts
Location: Determine how much wax will be needed and where will you add it.

25. Raise the die slightly, add the wax that you estimate will be needed, allow the wax to cool slightly then push the die back to place.

26. Adjust the wax, either remove excess reheat and reseat or add more wax and seat before the addition has hardened.

27. Facial view

28. Occlusal view
Develop the size and location of the proximal contact. Go ahead and develop the marginal ridge at this time also.

29. Be sure and close the articulator before each addition of wax has cooled*. At some point you will pick up the contact for the DL cusp of #3. Notice that the facial and lingual embrasures may be begun at this time.

30. Discipline # 1
1) The die must be in the articulator when you are making additions to the occlusal surface.
2) Allow the wax to cool slightly then close the articulator. This will prevent you from waxing in a high occlusal contact.

31. Develop the mesial proximal contact following the same procedure
Develop the mesial proximal contact following the same procedure. There will not be an occlusal contact on the mesial marginal ridge, just make the height equal to the distal marginal ridge of #29.

32. Scribe in lines indicating where the opposing triangular ridges are located. This tells you where your buccal grooves will be located and dictates the proportion of the buccal cusps.

33. Close the articulator to visualize where the buccal cones are going to be placed.

34. Blue Wax: begin the cone for the MB cusp, close the articulator
Blue Wax: begin the cone for the MB cusp, close the articulator. Adjust the position and height of the cone with each addition.

35. Continue until the cone touches exactly on the mark
Continue until the cone touches exactly on the mark. Trim it to the appropriate size.

36. The blue cone for the distobuccal cusp is positioned in the center of the tripod marks. It does not contact the center of the central fossa of #3.

37. Add wax to form the mesial cusp ridge, the wax addition will flow into the marginal ridge.

38. Close the articulator while the wax is still warm
Close the articulator while the wax is still warm. There should be no contact except on the cusp tip.

39. Add wax for the distal cusp ridge of the MB cusp
Add wax for the distal cusp ridge of the MB cusp. Notice that it ends at the line indicating the MB groove.

40. Close the articulator again; if there is contact anywhere other than the cusp tip, carve it away.

41. Add wax for the MB cusp ridge of the Distobuccal cusp
Add wax for the MB cusp ridge of the Distobuccal cusp. This cusp ridge will contact the triangular ridge of the MB cusp of #3 and form the first of the tripod contacts.

42. Add wax to the mesial cusp ridge until you see that you are getting a contact.

44. Add wax to form the distal cusp ridge
Add wax to form the distal cusp ridge. The contact with the triangular ridge of the DB cusp of #3 will be the second tripod mark.

45. Wax in the distal cusp in whatever space is left distal to the DB groove. It does not need to have an occlusal contact in this case.

46. You now have two parameters established: 1) Location of the cusp tips and grooves ) Contour of the wax at the finish line Add wax to fill in areas between the two.

47. Heat smooth and carve to form
Heat smooth and carve to form. Adjust the contours by viewing the waxing from various angles.

48. Occlusal View
Look at buccal embrasures and buccal contours.

49. Buccal, viewed from the anterior
Buccal, viewed from the anterior. Compare the profile of the waxing to the profile of the adjacent molar. Complete the buccal surface before moving on to the next step.

50. Lingual Cusps – Cone Location
Mark the linguoocclusal lines on both adjacent teeth. This will help you with the buccal – lingual position of the cusps.

51. Mark the location of the cusp tips of the contra-lateral with vertical lines. This will help give you an idea of the mesiodistal spacing of the cusp tips.

52. The mesiolingual cone should be over the embrasure between #3 & #4
The mesiolingual cone should be over the embrasure between #3 & #4. The distolingual cone should be over the lingual groove of #3.

53. There should be some space (1-1
There should be some space (1-1.5 mm) between the distolingual cone and the lingual surface of #3.

54. Mesiodistal orientation of the cones for the lingual cusps
Mesiodistal orientation of the cones for the lingual cusps. They are usually spread farther apart than you would expect.

55. Comparing linguoocclusal lines.

56. Add mesial and distal cuspal ridges on both of the lingual cusps.

57. Fill in the areas between the cusp tips and ridges on top and the contour established at the gingiva on the bottom.

58. Maintain the separation of the mesial and distal lobes of the lingual surface. The lingual groove on the occlusal continues over onto the lingual surface in the form of a concavity.

60. Add wax in the central fossa to capture the cusp tip of the ML cusp of #3. Use either blue or red wax. Trim the indentation back until the landing area is about 2mm wide.

61. Scribe in the basic occlusal pattern of the tooth.

62. The triangular ridge of the DB cusp usually “points” to the lingual groove.

63. The central groove moves forward from this pattern to the mesial fossa.

64. The central groove goes to the distal to end in the distal fossa.

65. Begin with the DB cusp, add wax to form the triangular ridge
Begin with the DB cusp, add wax to form the triangular ridge. Close the articulator while the wax is still soft. Continue to build up the ridge until the desired contact is achieved.

66. Look for a flat facet to appear.

67. Fill in the remaining triangular ridge areas one segment at a time
Fill in the remaining triangular ridge areas one segment at a time. You do not want contacts on any of the other areas.

69. Refining occlusal contacts: Verify that the shim stock reference still holds. If it does not, use the powdered wax to mark contacts. Carve them all down until the shim stock will hold.

70. To redefine contact points: Add a small drop of wax to one contact point and close the articulator. Heat smooth and carve to blend the addition into the adjacent wax then recheck with the powdered wax.

71. Continue to re-establish the contact points one at a time until you have them all.

72. Dust off the powder. Smooth areas than don’t have contact points with the pointed end of a #7 wax spatula or other instrument. Define the groove pattern.

73. Check for interferences in lateral movements
First:
Lower the latch pin

74. Gently, move the articulator through right and left working and protrusive movements.

75. You should be able to visually see that your waxing of #30 is separating immediately in both excursive movements. If you think that there may be a working or nonworking interference then use your powdered wax to try to locate it.

76. You would like to see your original MI contacts only
You would like to see your original MI contacts only! Any new marks or streaks should be carved away - these marks represent lateral interferences.

77. Working interference – the lingual groove is placed too far distally.

78. Next, remove the die and reseal the margin all around with a small new addition of wax. Melt the wax well as you seal.

79. Re-carve the margin as described earlier
Re-carve the margin as described earlier. Blend with the existing axial contour. Look closely for any defects in the margin, if noted re-wax and re-carve until the margin is perfectly sealed, smooth and well contoured.

80. Inspect the margin while viewing from an apical direction, defects will be more apparent.

81. FINAL CHECKLIST
1.) Reference point still holds shim stock
2.) Occlusal contacts, free from lateral interferences
3.) Proximal contacts
4.) Line angles, embrasures & axial contours

82. ATTENTION!
At the end of the Practical session the last thing that you should do is:
Carefully check for and remove any wax that is in heavy occlusion.
Set your guide pin so that the casts are slightly separated
Make sure that your student number is written on the casts where it can easily be seen
Turn in your articulator with the casts

83. Tripoding the mesiolingual cusp of #3 is optional
Tripoding the mesiolingual cusp of #3 is optional. A flat landing area in the central fossa of #30 is all that we require. If you do want to tripod follow these steps:

84. You already have a contact on the triangular ridge of the distobuccal cusp. This will be a “shared” contact with both tripods.

85. Add wax to increase the convexity of the triangular ridge of the distolingual cusp until a contact is achieved.

86. Carve this stop away by refining the central groove and central pit area.

87. Add wax to increase the convexity of the triangular ridge of the mesiolingual cusp until a contact is formed.

88. Congratulations! You have completed your task.
Thank you for all your Hard work.