Marginal adaptation and microleakage of thixotropic and injection-capsule composites, an in vitro study.

The marginal integrity of MOD adhesive restorations of a thixotropic test composite (ZKP-A-5) and of two injection-capsule composites (Concise -capsule composite and Compocap-S) was examined. Dy penetration tests measured microleakage and scanning electron microscope evaluated marginal adaptation. The test restorations showed no improved micromorphological marginal adaptation when compared to those of a standard paste-paste composite (Concise). Compocap-S demonstrated better prevention of microleakage than did the other test preparations. The marginal quality of these thixotropic and injection-capsule composite restorations was improved from 34% to 52% with utilization of a sealer application (ZKP-A-2), (Concise-Enamel Bond). The application of a sealer prior to insertion of thixotropic and injection-capsule composites is, therefore, definitely indicated when these materials are used. The resultant restorations obtained with these test materials plus sealer correspond qualitatively to those of standard composites Concise or Adaptic [6,7]. The newly developed, complete composite systems (Nimetic, GC's Epolite 100/Epobond) demonstrated in comparison to Concise and Adaptic [6,7] inferior results.