COMPARATIVE EVALUATION OF MARGINAL SEALING ABILITY OF POSTERIOR PACKABLE COMPOSITE WITH OR WITHOUT LINERS USING DYE PENETRATION METHOD- AN INVITRO STUDY.

Condensable” or “packable” composites (Surel) were introduced as an alternative to dental amalgam. However, concerns have been raised related to the ability of these stiffer materials to adequately adapt to internal surfaces. To offset this problem, low viscosity owable liners walls are recommended under packable composites. This study aimed at evaluating the effect of SDR and Ketac N100 liners on marginal sealing ability of High Density Surel posterior packable composite. Methodology: Sixty permanent extracted molars were mounted in a modelling wax and box only Class II cavities were prepared on the mesial side with gingival seat 1mm above CEJ. Teeth were divided into 3 groups: Group (i) Surel with SDR; Group (ii) Surel with Ketac N 100; and Group (iii) Surel without liner. After restoration, the teeth were immersed in Methylene blue dye, sectioned mesiodistally and then evaluated for leakage under Stereomicroscope. Results: None of the groups were free of microleakage. Surel without liner (1.2±0.696) exhibited maximum microleakage followed by Ketac N100 group (0.9±0.718) and SDR group (0.8±0.523) showed least microleakage. Conclusion: Posterior packable composites should be lined by a resin based liner at the gingival margin to allow better seal