Dental Problems

Lamination Techniques

ToothA various number of techniques have been used for the proper restoration of caries. Lamination techniques have been one among the best techniques for proper prevention and treatment of caries. In this article, there is a brief discussion on the clinical technique of lamination techniques. Let us examine them.

Lamination techniques:

There is a very significant relationship between the composite resins and glass ionomers and the most important factor is that they can be successfully combined so that the strength of one can be adequately compensate for the weakness of the other. Both are acceptably aesthetic but composite resin with present techniques will not bond adequately bong term to dentin. This applies particularly in deciduous teeth and must be regarded as a significant weakness.

On the other hand glass ionomer lacks fracture strength to the extent that it is limited in its ability to restore a marginal ridge which is under occlusal load. But with a little care the two materials can be united to the extent that they make a very useful combination and can thus offer sufficient longevity for the average restoration of reasonable dimension.

The technique for construction of a laminated restoration involves the use of a fast setting high strength glass ionomer as a base or dentin substitute, will allow for the development of a sound ion exchange union between the restoration and the dentin. Placement of the most wear resistant composite resin over this will provide an enamel replacement that is aesthetic and long lasting.

Clinical technique:

  • Prepare a conservative cavity such that the adhesive materials can support the undermined enamel.
  • Condition the cavity in preparation for the placement of glass ionomer.
  • For a proximal lesion place a short length of mylar strip as a matrix and support it gently with a wooden wedge.
  • Place the glass ionomer and tap it gently into place to ensure good adaptation of the cement to the floor of the cavity so that it will be free of porosity.
  • Allow the glass ionomer to set or if a resin modified material is being used, apply the activator light from different positions for at least 40 seconds.
  • The cavity can then be redesigned as a composite resin cavity taking into account the relative flexibility of this material along with its ability to unite with the glass ionomer.
  • The cavity must be at least 2.0mm deep, all enamel margins should be exposed so that the full micromechanical attachment if composite resin to enamel is available.
  • If the proximal box is so deep that there is no enamel at the gingival margin then leave the proximal floor as glass ionomer only.
  • Having prepared the cavity both the enamel and the glass ionomer should be etched with 37 percent orthophosphoric acid for 15 seconds only.
  • Wash the cavity thoroughly and dry lightly.
  • Now paint the entire cavity with a light coat of a resin enamel bond and then activate the area with light source.
  • The matrix system can now be repositioned as required and wedged tightly into place.
  • The composite resin can now be built incrementally taking care to add no more than 3.0 mm in depth in any increment.
  • Light activate each increment for at least 40 seconds and over build a little to allow for loss of bulk during contouring and polishing.
  • Following final contouring, light activate once more for at least 40 seconds to ensure a complete cure in depth.
  • The lamination techniques can be utilized for the reinforcement of any material that is regarded as insufficiently strong for a given situation.

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