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  1. 1. Welcome To Dentistry!! Class 1 Amalgam Restorations (#30) Sam Christensen B.A., D.D.S. Class of ‘05
  2. 2. Location of Class I Cavities  Pit and fissure cavities on the occlusal surfaces of pre-molars and molars
  3. 3. #30?! Which one is that?? #6 #19 #30
  4. 4. Class “Everything Else”  Class 2: In the contact areas between back teeth  Class 3: In the contact areas between front teeth  Class 4: Contact areas between front teeth involving the incisal edge  Class 5: At the gumline  Class 6: On a cusp tip
  5. 5. Review of the Seven Steps in Cavity Preparation G.V. Black’s Seven Steps • Establish Outline Form • Obtain Resistance Form • Obtain Retention Form • Obtain Convenience Form • Remove Remaining Caries • Finish Walls and Margins • Cleansing of cavity
  6. 6. Criteria for a Class I Amalgam Preparation  Outline Form  Smooth and fluid  No sharp angles  All pits and grooves removed, dovetails extend into buccal, lingual, proximal grooves Preparation centered on central developmental groove
  7. 7. PRIMARY GROOVES MARKED
  8. 8. CORRECT OUTLINE FORM
  9. 9. Isthmus just wide enough to accept #1 condenser
  10. 10. Marginal ridge walls 1/2 distance from mesial and distal pit to the crest of each marginal ridge
  11. 11. Review of the names of Class I Preparation Walls
  12. 12. Criteria for a Class I Amalgam Preparation •Internal Form Bucco-Lingual View •Buccal and Lingual Walls are Parallel to each other and to the Long Axis of the Crown (Provides retention) •Buccal, Lingual, and Proximal Walls meet Pulpal Floor at sharp angle •Buccal and Lingual Walls meet Proximal in smooth, rounded form
  13. 13. Long axis of the tooth
  14. 14. Long axis of the crown
  15. 15. PERPENDICULAR IN BUCCO- LINGUAL DIRECTION
  16. 16. PERPENDICULAR IN MESIAL- DISTAL DIRECTION
  17. 17. BUR ALIGNED WITH THE LONG AXIS OF THE TOOTH- WRONG! The floor of the preparation could reach the pulp!
  18. 18. Bur aligned with long axis of the crown - CORRECT!
  19. 19. •Pulpal Floor mesio-distally is flat and perpendicular to the long axis of the tooth
  20. 20. Caries removal with 330 bur  ideal depth is 1.5 mm when smooth and finished CONTROL THE DEPTH OF YOUR PREPARATION  at this step, go to depth of 1 mm  extend up to mesial and distal pits
  21. 21. Caries removal with 330 bur
  22. 22. Extension and Smoothing with 56 bur with high speed handpiece
  23. 23. Rashad’s First Prep
  24. 24. Good Prep
  25. 25. Questions?
  26. 26. University of the Pacific School of Dentistry

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