Composite resin technique

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Composite resin technique

  1. 1. Technique of composite resin By Amin Abusallamah
  2. 2. Steps of restoration <ul><li>Isolation </li></ul><ul><li>Etching /Conditioning </li></ul><ul><li>Washing /Drying </li></ul><ul><li>Bonding </li></ul><ul><li>Curing </li></ul><ul><li>Determine shade </li></ul><ul><li>Incremental buildup & curing of composite </li></ul><ul><li>Finish/polish </li></ul>
  3. 3. Isolation <ul><li>Composite is a highly technique sensitive material </li></ul><ul><li>Slight contamination or procedural error spoils the durability of the restoration </li></ul><ul><li>Perfect isolation of operating area is mandatory </li></ul><ul><li>The best isolation is rubber dam . </li></ul>
  4. 4. Etching /Conditioning <ul><li>Enamel </li></ul><ul><li>Dentin </li></ul>Both the tissues are etched with Phosphoric acid.
  5. 5. Enamel Etching <ul><li>To cut into the enamel surface through the action of acid </li></ul>After washing
  6. 6. Etchant <ul><li>32- 37 % phosphoric acid </li></ul>liquid gel
  7. 7. Dentin conditioning <ul><li>Chemical alteration of dentinal surface by acids to remove the smear layer and demineralize the dentin </li></ul>
  8. 8. Cont … <ul><li>Various acid are supplied with various adhesive systems </li></ul><ul><li>Citirc acid </li></ul><ul><li>Maleic acid </li></ul><ul><li>Nitric acid </li></ul><ul><li>Phospshoric acid </li></ul><ul><li>Etching time: </li></ul><ul><li>Applied for 15-30 seconds </li></ul><ul><li>For deciduous teeth : 60 seconds </li></ul>
  9. 9. Applying Etchant <ul><li>roughens the surface by removing calcium from enamel . </li></ul>
  10. 10. Washing and Drying <ul><li>Washing is performed with triple syringe for 5-10 seconds and then drying. </li></ul>
  11. 11. Etched enamel surface
  12. 12. Bonding <ul><li>Bonding agents are unfilled resins that flow into the micro channels and form an interlocking system. </li></ul><ul><li>It is available in liquid form </li></ul>
  13. 13. Application of bond <ul><li>Apply bonding agent with help of a small brush. </li></ul>
  14. 14. curing 20 seconds
  15. 15. Determine shade
  16. 16. Matrix band application Apply matrix band & wedge for class II Build proximal walls with composite
  17. 17. Incremental buildup & curing of composite Fill the cavity in increments and adjust it. Cure each increment for 40-45 sec.
  18. 18. Finish & polish Tungsten carbide finishing bur is used to contour the marginal ridge (note the water spray). Rugby ball’-shaped fine diamond is used to contour the occlusal anatomy. All high-speed instruments must be used with water spray. A flexible, abrasive, impregnated disc is used to polish and smooth the occlusal contours.
  19. 19. Thank you Reference: Pickard’s Manual of Operative Dentistry, Eighth edition Chapter 6…. P 111,112 Chapter 8…. P 140,141,142,143

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