Matricing

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Matricing

  1. 1. MATRICING
  2. 2. DEFINITION • Matricing is the procedure whereby a temporary wall is created opposite to axial walls, surrounding areas of tooth structure that were lost during preparation. »PARTS OF MATRIX • Band • Retainer
  3. 3. FUNCTION
  4. 4. FUNCTION •To restore anatomic contours and contact areas Qualities of a good matrix •Rigidity •Establishment of proper anatomic contour •Restoration of correct proximal contact relation •Prevention of gingival excess •Convenient application & ease of removal
  5. 5. TYPES OF MATRICES
  6. 6. MATRICES FOR CLASS I • Ivory matrix band no.8
  7. 7. MATRICES FOR CLASS I
  8. 8. MATRICES FOR CLASS I
  9. 9. MATRICES FOR CLASS I
  10. 10. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) Left bottom is a clinical photo of a Tofflemire retainer. left top shows a straight Tofflemire retainer (above) and a contra- angled tofflemire retainer (below). The straight retainer is used most frequently and is normally placed on the buccal side of the tooth. The contra- angle retainer may be use when the retainer must be place on the lingual surface of the tooth. The angle of the handle allows it to be placed without the interference of the anterior teeth.
  11. 11. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) TYPES [1] Straight: placed buccaly [2] Contra angled: can also be placed lingually
  12. 12. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • INDICATION [1] MOD preparation filling of posterior teeth [2] Also for MO or DO class II restoration
  13. 13. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • Advantage [1] The retainer and band are stable when in place [2] Easy seperation of retainer from band which makes easy removal of band [3]Less time required for placement [4]Help to hold the cotton roll in place Disadvantages [1] Proximal surfaces restored using the tofflemire matrix requir more carving than those restored with the compound supported matrix. [2] Contouring of matrix band is required.
  14. 14. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • The left bottm drawing shows two of the common problems which can occur with the use of a matrix band. #1 - Shows a matrix band that is resting above the top of the gingival margin of the proximal box instead of being placed at least 1mm below this margin. This will cause a submarginal defect at this cavosurface margin that may later lead to recurrent decay in that area. #2 - Shows a matrix band place without a wedge, and therefore is poorly adapted to the interproximal tooth structure. This allows an overhang of excess amalgam and may lead to recurrent caries and periodontal disease
  15. 15. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • BANDS • There are various sizes and shapes of matrix material. The most common are pictured in the top left photo. The universal band is most commonly used. As the photo in the top right shows, the depth of the proximal box in a gingival direction can vary greatly. To accommodate the deeper boxes, an MOD band with loop extensions in the areas of the proximal boxes may be used. If only one proximal box is deep, then one of the loops may be removed with scissors.
  16. 16. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • PARTS [1] HEAD [2] SLIDING BODY(SLOTED VICE) [3] ROTATING SPINDLE( [4] SET SCREW
  17. 17. TOFFLEMIRE MATRIX ( UNIVERSAL MATRIX ) • The most commonly used matrix system is the Tofflemire Universal matrix band retainer. the basic parts of the retainer are shown in the top right photo. The head of the retainer has three slots to allow the matrix band to exit out of the head to either side or straight ahead. The band is held in place by passing it through the sliding body and tightening the set screw to lock it in place. The rotating spindle is used to tighten the loop of band material (exiting from the head) around the tooth.
  18. 18. TOFFLEMIRE MATRIX TECHNIQUE When the matrix band is folded to make a loop, one side of the loop will form an opening with a greater circumference than the other. The band is designed this way to allow it to adapt to the narrower neck of the tooth. The narrowest opening of the loop should always go toward the gingval to allow the band to properly adapt to the tooth. The end of the slots of the Tofflemire retainer should also always face the gingiva to allow easy removal of the retainer. This means that the loop of matrix band should be placed into the tofflemire retainer so that the narrowest end of the loop should always be near the open end of the slots of the tofflemire retainer.
  19. 19. TOFFLEMIRE MATRIX TECHNIQUE The photos above show a properly engaged matrix band in the Tofflemire retainer. Notice in the photo at the top left that the narrowest end of the looped matrix band material is located on the same side of the retainer as the open slots of the head
  20. 20. TOFFLEMIRE MATRIX TECHNIQUE The occlusal edge of the matrix band should extend 1mm. beyond the height of the adjacent marginal ridge. If it extends more, then the excess should be trimmed away to reduce the overall height of the band. The band is normally trimmed at the gingival margin to allow the band to adapt to the gingival contours.
  21. 21. TOFFLEMIRE MATRIX TECHNIQUE Once the matrix band is placed into the slots of the head and the ends of the band are located in the sliding body, the set screw is turned in a clockwise direction to tighten the band in place.
  22. 22. MATRICES FOR CLASS II • Ivory matrix no.8
  23. 23. MATRICES FOR CLASS II • Ivory matrix no.1
  24. 24. MATRICES FOR CLASS II • Black’s matrices [1] For simple cases [2] With a gingival extension to cover the gingival margin of subgingival cavity
  25. 25. MATRICES FOR CLASS II • Soldered band or seamless copper band matrix
  26. 26. MATRICES FOR CLASS II • Anatomic matrix
  27. 27. MATRICES FOR A CAVITY PREPARATION FOR AMALAGM RESTORATIONS ON DISTAL ASPECT OF CUSPID • S-shaped matrix
  28. 28. MATRICES FOR CLASS III DIRECT TOOTH COLOURED RESTORATIONS • Band strip matrix
  29. 29. MATRICES FOR CLASS III DIRECT TOOTH COLOURED RESTORATIONS • Matrix for two small proximal preparation in contact with each other
  30. 30. MATRICES FOR CLASS IV PREPARATIONS FOR DIRECT TOOTH COLORED MATERIALS • Plastic strip for inciso- proximal cavity • Transperant crown form matrices ( stock plastic crowns ) • Aluminium foil incisal corner matrix ( stock metallic matrices )
  31. 31. MATRICES FOR CLASS V PREPARATIONS FOR DIRECT TOOTH COLOURED MATERIALS • Anatomic matrix for non-light cured, direct tooth coloured materials
  32. 32. MATRICES FOR CLASS V PREPARATIONS FOR DIRECT TOOTH COLOURED MATERIALS • Anatomic matrix for light and non-light cured direct tooth- coloured materials
  33. 33. COMPOUND SUPPORTED MATRIX
  34. 34. COMPOUND SUPPORTED MATRIX
  35. 35. COMPOUND SUPPORTED MATRIX
  36. 36. AUTOMATRIX • It is a retainerless matrix system with four types of bands that are designed to fit all teeth, regardless of circumference. • TYPES (1) Narrow regular (2) Wide regular (3) Medium thin (4) medium regular
  37. 37. AUTOMATRIX • DIMENSION Height: 4.7 to 7.9 mm Thickness: [1] 0.038mm [2] 0.050mm • INDICATION Extensive class II preparation, especially those replacing two or more cusps.
  38. 38. AUTOMATRIX • ADVANTAGES Auto-lock loop can be positioned either on the facial or lingual surfaces with ease. • DISADVANTAGE Bands are not pre contoured and development of physiological proximal contours is difficult
  39. 39. THANK YOU

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