Comparative Evaluation of Sealing Ability of Biodentine, Smart Dentine Replacement (SDR) and Resin Modified Glass Ionomer Cement (RMGIC) in Cervical Lining Restorations by Dye Extraction Method: An in-Vitro Study

Introduction: The increasing demand for aesthetic procedures, along with the advantage of minimal invasive procedure and bonding to tooth structure has drastically increased the popularity of composite resin restorations. The major disadvantage of resin based materials is polymerization shrinkage that causes microleakage leading to bacterial penetration which results in post-operative sensitivity, marginal discolouration, secondary caries and even restoration loss. To overcome the demerits of Glass ionomer cements and resin modified GIC, use of flowable resin composite& tricalcium based bioactive restorative material (Biodentine) as an intermediate material in the gingival seat has been suggested to reduce polymerization shrinkage Aim: To evaluate the sealing efficacy of Biodentine, Smart dentine replacement (SDR) and Resin modified Glass Ionomer cement (RMGIC) at the cervical margins of approximal cavities of posterior teeth. Material and methodology: 30 approximal cavities were prepared on 30 extracted human molars. Teeth were randomly assigned into 3 groups of 10 cavities each: (G1) - Biodentine as lining material+ Filtek Z350 XT (light cured composite) as restorative material, (G2) � Smart dentine replacement as lining material+ Filtek Z350 XT (light cured composite) as restorative material, (G3) � Resin modified Glass Ionomer cement + Filtek Z350 XT (light cured composite) as restorative material as positive control. The material was used according to manufacturer�s instructions. The teeth were thermocycled (5�C to 55�C). The specimens were then sealed with a 1-mm window around the marginal interface with red nail varnish and were immersed in a methylene blue solution for 24 hours. Samples were then immersed in a 69 % w/v nitric acid solution for dye extraction test. The amount of dye extracted was directly measured using spectrophotometer. The results were expressed as Absorbance that is amount of dye extracted from each specimen. The data were analysed with the parametric One-way ANOVA test (p