Практикум по переводу с английского языка на русский. Базарова Б.Б - 80 стр.

                                                     TEXT 5
      Clinical Problem-Solving in Prosthodontics
                                                Ceramic onlays
      Clinical details
      This patient suffers from regurgitation erosion and needs restorations on his premolars as part of
a more complicated treatment plan. There are no medical complications and his symptoms of reflux
have recently been controlled with medication.
      Clinical observations
      - Both teeth give a positive response to the electric pulp tester.
      - There is sufficient interocclusal space for the restorations.
      - The restorations are part of a full mouth rehabilitation.
      - The diagnosis of the tooth wear is regurgitation erosion and a parafunctional activity.
      What are the options for treatment?
      − Direct composite build-ups;
      − Indirect composite, porcelain or metal onlays;
      − Amalgam restorations;
      − Glass ionomer;
      − Elective root treatment with conventional post and core.
      Direct composite build-ups
      These are the simplest restorations and rely upon the strength of the bond between the tooth and
dentine-bonding agent/composite to retain the restoration. Thereafter, the composite can be used as a
core for a conventional crown or used as the definitive treatment. The advantage of using a composite
and a dentine-bonding agent linked to the tooth is the high bond strength, which is sufficient for
retention. Additional forms, such as pins or grooves, are not needed. In addition, because the bond is
the major retentive feature, removal of tooth tissue is only required if caries is present and it is
therefore a more conservative technique.
      Direct composite can be difficult to place, especially around contact points. Although there are a
number of recent matrix bands, which are reportedly easier to use and produce a more consistent
contact point, this still remains a clinically demanding technique.
      The core is retained between the dentine-bonding agent and the tooth surface. Most modern
dentine-bonding agents have approximately similar bond strengths to enamel and dentine. It is
believed that the strength of the bond results from the micro-mechanical tags of the bonding agent
penetrating the dentinal tubules and infiltrating the hybrid layer. The hybrid layer is the partially




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