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 (Surefil) 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 fiowable 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 Surefil 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) Surefil with SDR; Group (ii) Surefil with Ketac N 100; and Group (iii) Surefil 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. Surefil 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

The Study On The Color Stability Of Composite Resin / 대한치과보철학회지

The purpose of this study was to investigate the color stability of composite resins used widely as esthetic restorative material.Surefil(Dentsply,U.S.A.),Esthet X(Dentsply,U.S.A.),Filtek P60(3M,U.S.A.),Filtek Z250(3M,U.S.A.),Synergy Compact(Coltene,Switzerland),and Synergy Duo(Coltene,Switzerland)were chosen for this study.Thirty six specimens(7mm x2mm) of each composite resin were fabricated and polished after polymerization.Treatment conditions designed for this study were thermocycling,methylene blue staining,and filtered coffee staining. The color changes before and after treatment were measured by colorimeter(colorimeter,Model Tc-6Fx,Tokyo Denshoku Co.)and analyzed. The followings were drawn from this study: 1.The color changes of Filtek Z250,Surefil,Filtek P60 and Esthet X after thermocycling for 3 weeks were greater than those of the others. 2.The color changes of Surefil and Esthet X after methylene blue staining and those of Surefil, Filtek Z250 and Filtek P60 after coffee staining were great. 3.The color changes of Synergy Duo and Synergy Compact after thermocycling and coffee staining were relatively lesser than those of other composite resins.