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Volume 9 Issue 1 (January, 2021)

Original Articles

An in vitro study of comparative evaluation of acid etching of Glass Ionomer Cement Surface and resin modified Glass Ionomer Cement on the microleakage of sandwich restorations
Vedanshi Patel, Parnashi Purohit, Zarana Sanghvi, Shraddha Choksi, Pruthvi Patel, Nishit Patel

Background and objective: Despite of mechanical properties of glass ionomer cements, esthetic appearance still limits its use. Thus, the sandwich techniques used to preserve the fluoride release mechanism and the chemical bond provided by GIC and RMGIC. Aim of this study is to evaluate the sealing ability of glass ionomer cements (GICs) and Resin modified GIC used for sandwich technique and to evaluate the effect of acid etching of GIC surface on microleakage at GIC composite resin interface. Methodology: Twenty four square shaped cavities will be prepared on the proximal surfaces of 12 permanent human premolars (2 cavities per tooth), assigned to 4 groups (n=6) and restored. Group 1 – conventional GIC will be applied onto the axial and cervical cavity walls, allowed setting for 5 min and37% phosphoric acid etching along the cavity margins for 15 s, washed for 30 s and the adhesive system was applied and light cured for 20 s, and restoration will be completed with composite light cured for 40 s; Group 2 – same as Group 1, except for acid etching of the GIC surface; Group 3 – same as 1, but using a resin modified GIC (RMGIC); Group 4 – same as Group 3, except for acid etching of the RMGIC surface. Samples will be immersed in 1% methylene blue dye at 37°C for 24 h, rinsed for 30 min, then sectioned mesiodistally through the centre of the restoration and restorations will be examined in an optical microscope for dye penetration. Results: Results were statistically analyzed by Kruskal-Wallis and chi-square tests (α=0.05). The results suggest that etching of GIC surface before the placement of resin composite does not improve the sealing ability of sandwich technique restorations. Conclusion and interpretation: The RMGIC was more effective than GIC at the GIC-resin composite dentin interfaces. Keywords: Glass ionomer cements; Composite resins; microleakage; RMGIC

 
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