FINISHING AND POLISHING
The surface of the casting that is retrieved from investment is too rough for use in the mouth.Fivepreparatory procedures ...
PROCEDURES Preliminary finishing Try-in & adjustment Pre-cementation polishing Cementation polishing Post-cementation...
• The internal and external aspects of  restoration are handled differently.• External surface     smooth &perfect  uninte...
ABRASIVES AND POLISHING        MATERIALS• ABRASIVES:exceptionally hard material  that develop sharp cutting edges when the...
COMMONLY USED ABRASIVES AND POLISHING MATERIALS DIAMOND SILICON CARBIDE EMERY ALUMINIUM OXIDE GARNET SAND CUTTLE T...
COMMONLY USED FORMS SEPARATING DISCS MOORE’S DISC HEATLESS STONES BUSCH SILENT STONES GREEN STONES PINK STONES WHIT...
ZONES OF FINISHING AND          POLISHING•   ZONE 1:INTERNAL MARGIN•   ZONE 2:INTERNAL SURFACE•   ZONE 3:SPRUE•   ZONE 4:P...
PRELIMINARYFINISHING OF GOLD   RESTORATION
PROCEDURES    …
Inspect under surface of cast under magnificationfor small nodules or bubblesRemove nodule with no:330 bur in high speed.T...
Use a separating disc to cut the sprue from thecastingDiagonal cutting plier may be used.Hold hand piece with a firm pen g...
Sprue immediately adjacent to thecasting is removed with separating disc
Use coarse rubber disc-to smooth away theroughness left by the separating disc.Use finer Burlew/gold lustre blue disc insi...
Axial surfaces are smoothed with Burlew                 wheel
Adjust occlusion in articulator-centric&eccentricRemove restoration from working cast and place itback to dieNo:0-”bud” fi...
TRY-IN & ADJUSTMENT
If careful and gentle no need ofanesthesiaPatient’s unimpaired tactile sense can bevaluable during adjustment of occlusion...
A safety ring may be fashioned by cutting      a thin slice from hollow sprue
Ring is luted to wax pattern
A length of dental floss is looped through         the ring on the casting
Floss is allowed to hang out the corner              of the mouth
• Remove provisional restoration by  grasping the buccal and lingual surface  with tips of backhaus towel forceps and  roc...
Provisional restoration removed    with backhaus forceps
A)Richwil crown remover soaked in hot water     B)patient closes on softened cube  C)patient opens quickly and forcefully ...
Evaluation of restoration in   following sequence:      Proximal contact      Margins      Occlusion      Contour     ...
Adjustment of proximal surface           contact Proximal contact – neither too tight nor too light. Place the restorati...
 Test for proximal contact  with waxed dental floss Satin finish on gold  restoration -  advantageous-  shiny burnished ...
Marginal adaptationAfter proximalcontact correctedseat restorationand examinemargin closely-should not be ;OverextendedUnd...
Various materials used to detect         discrepancies  Chloroform & rouge / thinned typewriter   correction fluid-painte...
 Areas of metal – tooth contact –  appear as shiny spot devoid of wax Relief impinging areas with no:30 bur-  allow rest...
GOLD MARGIN FINISHING 2 types of margins- sub gingival & supragingival Casting placed on prepared tooth and have the pat...
All accessible margins are burnished    intraorally with a smooth dull              instrument
Margins are finished with a whitestone rotating from gold to tooth
OCCLUSAL ADJUSTMENTAsk the patient to close in customary positionCheck if patient can hold the shim in between adjacent te...
Cntd…..• If mandible shifts to    • If mandible shifts  side of restoration        away from restoration• Buccal incline o...
If patient can hold shim stock on adjacent teethwith the crown out,but not with it , the crown is                     too ...
Premature contact on buccal incline of maxillary lingual cusp produces buccal shift to mandible
Premature contact on lingual slope of maxillary buccal      cusp produces lingual shift of mandible
Premature contact on lingual incline of maxillarylingual cusp produces lingual shift of the mandible
NON WORKING MOVEMENTS•   Non working interference
NON WORKING MOVEMENTS•   Working interference
CONTOUR• Improper contour-impaired gingival health• Excessive convexity near gingival margin••      Plaque accumulation
ESTHETICS• Restoration viewed from conversational  distance- see if contours harmonize with  rest of patient’s dentition• ...
PRE CEMENTATION POLISHING
Polished to high shine  polish axial surface with Tripoli on soft bristle brush     occlusal anatomy restored (171 L carbi...
Masking tape is wrapped around the              casting
Only the occlusal surface left          uncovered
Casting placed in sand blaster
Air brush used to apply a matte finish  to occlusal surface of the casting
POST CEMENTATION    FINISHING
 Occlusion checked Finishing with fine rubber point White polishing stone with lubrication  (petrolatum) To inaccessib...
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Finishing and-polishing (1)
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Finishing and-polishing (1)

  1. 1. FINISHING AND POLISHING
  2. 2. The surface of the casting that is retrieved from investment is too rough for use in the mouth.Fivepreparatory procedures need to be performed on any type of cemented restoration after it has been fabricated
  3. 3. PROCEDURES Preliminary finishing Try-in & adjustment Pre-cementation polishing Cementation polishing Post-cementation finishing
  4. 4. • The internal and external aspects of restoration are handled differently.• External surface smooth &perfect uninterrupted transition from restoration to tooth• Rough surface plaque accumulation- injurious to health of periodontal tissue• Try in satin finish after chairside adjustment high luster• Finishing&polishing- accomplished with fixed routine-coarse and fine
  5. 5. ABRASIVES AND POLISHING MATERIALS• ABRASIVES:exceptionally hard material that develop sharp cutting edges when they are chipped.• POLISHING MATERIALS:abrasives of softer material that are reduced to extremely fine particle size.
  6. 6. COMMONLY USED ABRASIVES AND POLISHING MATERIALS DIAMOND SILICON CARBIDE EMERY ALUMINIUM OXIDE GARNET SAND CUTTLE TRIPOLI ROUGE TIN OXIDE
  7. 7. COMMONLY USED FORMS SEPARATING DISCS MOORE’S DISC HEATLESS STONES BUSCH SILENT STONES GREEN STONES PINK STONES WHITE STONES RUBBER WHEEL AND POINTS
  8. 8. ZONES OF FINISHING AND POLISHING• ZONE 1:INTERNAL MARGIN• ZONE 2:INTERNAL SURFACE• ZONE 3:SPRUE• ZONE 4:PROXIMAL CONTACT• ZONE 5:OCCLUSAL SURFACE• ZONE 6:AXIAL WALL• ZONE 7:EXTERNAL MARGIN
  9. 9. PRELIMINARYFINISHING OF GOLD RESTORATION
  10. 10. PROCEDURES …
  11. 11. Inspect under surface of cast under magnificationfor small nodules or bubblesRemove nodule with no:330 bur in high speed.Trace negative angles on inside of occlusal surfacewith tip of burIdeally the cast should touch the die only in themarginal region –there should be a slight gap everywhere else for future cementation.A uniform space of 25 – 35micrometer necessaryIf nodules present removed with round carbidebur
  12. 12. Use a separating disc to cut the sprue from thecastingDiagonal cutting plier may be used.Hold hand piece with a firm pen grasp whilecutting the sprue next to the castingAvoid tipping the disc- if a disc binds in the cutgrooves – it may flip the casting out of our handAfter removing the sprue , use separating to trimthe remaining portion of sprue attachment on thecasting until the contour in that area is continuouswith the contour of the restoration surrounding thesprue
  13. 13. Sprue immediately adjacent to thecasting is removed with separating disc
  14. 14. Use coarse rubber disc-to smooth away theroughness left by the separating disc.Use finer Burlew/gold lustre blue disc insimilar manner after coarse disc-now entiresurface smooth with satin finishAxial surface finished to the margin-do notextend over the margin-seat the restorationon the castAdjust the interproximal area-untilrestoration seats completely with contactingadjacent teeth
  15. 15. Axial surfaces are smoothed with Burlew wheel
  16. 16. Adjust occlusion in articulator-centric&eccentricRemove restoration from working cast and place itback to dieNo:0-”bud” finish bur – to smooth grooves onocclusal surfaceSmooth cusp tips and blend them into the grooveson the occlusal surface with a small rubber sulcidiscExternal surface should have a satin like finishproduced by Burlew rubber polishing wheel
  17. 17. TRY-IN & ADJUSTMENT
  18. 18. If careful and gentle no need ofanesthesiaPatient’s unimpaired tactile sense can bevaluable during adjustment of occlusionSmall safety ring provided by cutting athin slice from hollow sprueAttach it to the wax pattern where itwill not interfere with occlusionThread floss through the ring beforetrying casting in the mouth.
  19. 19. A safety ring may be fashioned by cutting a thin slice from hollow sprue
  20. 20. Ring is luted to wax pattern
  21. 21. A length of dental floss is looped through the ring on the casting
  22. 22. Floss is allowed to hang out the corner of the mouth
  23. 23. • Remove provisional restoration by grasping the buccal and lingual surface with tips of backhaus towel forceps and rocking it to the facial and lingual.• Remove the left cement particles• Wipe of prepared surface with cotton pellet ( dry )• Wash with luke warm water
  24. 24. Provisional restoration removed with backhaus forceps
  25. 25. A)Richwil crown remover soaked in hot water B)patient closes on softened cube C)patient opens quickly and forcefully to remove crown
  26. 26. Evaluation of restoration in following sequence: Proximal contact Margins Occlusion Contour Esthetics
  27. 27. Adjustment of proximal surface contact Proximal contact – neither too tight nor too light. Place the restoration on the tooth & seat it with firm finger pressure. Do not mallet / apply occlusal pressure. Crown can be removed with Richwil crown remover soaked in hot tap water for 1min Patient closes on the softened cube Patient opens quickly and forcefully to remove crown
  28. 28.  Test for proximal contact with waxed dental floss Satin finish on gold restoration - advantageous- shiny burnished area where tight contact occurs
  29. 29. Marginal adaptationAfter proximalcontact correctedseat restorationand examinemargin closely-should not be ;OverextendedUnder extendedToo thickOpen- gap greaterthan 50µm
  30. 30. Various materials used to detect discrepancies  Chloroform & rouge / thinned typewriter correction fluid-painted in the internal surface  Thin layer of dry aerosol indicators – sprayed  DISCLOSING WAX:  Fill restoration ½ full of disclosing wax  Heat in flame to flow the wax & adhere to inner surface  Teeth wet with saliva( avoid sticking of wax)  Wax solidified seat restoration hold for 10 sec then remove
  31. 31.  Areas of metal – tooth contact – appear as shiny spot devoid of wax Relief impinging areas with no:30 bur- allow restoration to seat further Remove disclosing material by swabbing with chloroform and sand blasting Tooth cleaned with cavilax
  32. 32. GOLD MARGIN FINISHING 2 types of margins- sub gingival & supragingival Casting placed on prepared tooth and have the patient seat it by closing on plastic bite wafer/wooden stick Burnishing and marginal adaptation with dull spratley knife(30µm adaptation) Finishing with white stone (60µm adaptation) Final precementation smoothening with 3/8 inch cuttle disc
  33. 33. All accessible margins are burnished intraorally with a smooth dull instrument
  34. 34. Margins are finished with a whitestone rotating from gold to tooth
  35. 35. OCCLUSAL ADJUSTMENTAsk the patient to close in customary positionCheck if patient can hold the shim in between adjacent teeth with crown out – if not the crown too highAsk the patient to bite in centric relationForce until all teeth touch
  36. 36. Cntd…..• If mandible shifts to • If mandible shifts side of restoration away from restoration• Buccal incline of • BULLS maxillary lingual cusp / lingual incline of mandibular buccal cusp adjusted
  37. 37. If patient can hold shim stock on adjacent teethwith the crown out,but not with it , the crown is too high
  38. 38. Premature contact on buccal incline of maxillary lingual cusp produces buccal shift to mandible
  39. 39. Premature contact on lingual slope of maxillary buccal cusp produces lingual shift of mandible
  40. 40. Premature contact on lingual incline of maxillarylingual cusp produces lingual shift of the mandible
  41. 41. NON WORKING MOVEMENTS• Non working interference
  42. 42. NON WORKING MOVEMENTS• Working interference
  43. 43. CONTOUR• Improper contour-impaired gingival health• Excessive convexity near gingival margin•• Plaque accumulation
  44. 44. ESTHETICS• Restoration viewed from conversational distance- see if contours harmonize with rest of patient’s dentition• Let patient look in a mirror
  45. 45. PRE CEMENTATION POLISHING
  46. 46. Polished to high shine polish axial surface with Tripoli on soft bristle brush occlusal anatomy restored (171 L carbide bur )• Shiny finish • Matt finish (sandblasting) • Enable observation of facets/burnishing produced by occlusal contact after casting in mouth
  47. 47. Masking tape is wrapped around the casting
  48. 48. Only the occlusal surface left uncovered
  49. 49. Casting placed in sand blaster
  50. 50. Air brush used to apply a matte finish to occlusal surface of the casting
  51. 51. POST CEMENTATION FINISHING
  52. 52.  Occlusion checked Finishing with fine rubber point White polishing stone with lubrication (petrolatum) To inaccessible areas Fine cuttle disc Pumice and rubber cup FINAL POLISHING by – intraoral amalgloss
  53. 53. Thank you
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