Pedia class I

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Pediatric Dentistry I
Forth Year

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Pedia class I

  1. 1. Morphological Considerations in the Primary Dentition The crowns of primary teeth • Shorter • Narrower occlusal table • More pronounced cervical constriction • Thinner enamel & dentin layers
  2. 2. Morphological Considerations in the Primary Dentition The crowns of primary teeth • Enamel rods is slightly occlusal direction at DEJ • Broad flat contact areas between molars • The same mineral content as permanent teeth • Lighter , more homogeneous color
  3. 3. Contact Area Point contact Broad, flat contact
  4. 4. Morphological Considerations in the Primary Dentition The pulps of primary teeth • Larger crown size than the permanent tooth. • Closer to the outer surface of the tooth • Mesial pulp horn is pronounced occlusally • Follow the surface of the crown • Pulp horn under each cusp
  5. 5. Comparison of Pulps
  6. 6. Caries molar In occlusal surface of a posterior tooth, there are three possibilities : 1. Occlusal pit & fissure sealant only 2. Preventative resin restoration (PRR) 3. Traditional Class I restoration (C-RR)
  7. 7. Fissure sealant
  8. 8. Preventative resin restoration
  9. 9. Preventive resin restoration. Glass ionomer cement Composite resin Fissure sealant
  10. 10. Traditional Class I restoration
  11. 11. STEPS IN CLASS I AMALGAM RESTORATIONS • Appropriate anesthesia • Rubber dam isolation • Cavity preparation • Excavation of remaining caries • Trituration and placement of amalgam • Condensation, carving, burnishing • Check occlusion • Finishing and polishing
  12. 12. Clamps used in pediatric dentistry Partially erupted permanent molars 14A 8A Fully erupted permanent molars 14 8 Second primary molars 3 26 27 First primary molars 2 2 A Primary canines & incisors 0 00 209 Permanent canines 207 208
  13. 13. 330 bur • # 330 • # 245 • # 170 • # 169 BUR SELECTION
  14. 14. CAVITY PREPARATION Class I Amalgam • External outline form: - Inclusion of pits, fissures, grooves, caries - Extension of occlusal portion varies depending on primary molar involved - Slight occlusal convergence of walls - Sharp cavo-surface margins - Adequate tooth structure at marginal ridges -Width of prep 1/3 of occlusal table
  15. 15. Class I Amalgam • Internal outline form: - Establish depth at 0.5-1mm into dentin using # 330 bur - Walls are wider at pulpal floor - All internal line angles should be rounded - Slightly rounded pulpal floor
  16. 16. Mandibular Molars Outline Form
  17. 17. Maxillary Molars Outline Form
  18. 18. Outline Form
  19. 19. CLASS I COMPOSITE RESIN • CLASS I PREPARATION - Conservative, follows outline of decay - 0.5 mm into dentin (or deeper) - No occlusal bevel - Rounded internal line angles.
  20. 20. CLASS I COMPOSITE RESIN  CLASS I RESTORATION - Acid etch enamel and dentin - Rinse well (5-10 seconds) - Apply primer/bond to moist dentin - Dry and cure (10-20 seconds) - Place C.R. and cure (40 seconds) - Place occlusal anatomy - Check occlusion, adjust - Finish
  21. 21. CLASS I COMPOSITE RESIN

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