Comparative Evaluation of Microleakage in Various Placement Techniques of Two Composite Materials: An In Vitro Study

studies have shown that while both materials perform well in esthetic restorations, their effectiveness in minimizing microleakage depends heavily on the placement technique used. 5However, there is no consensus on whether nano-hybrids or giomers provide better marginal sealing in challenging clinical situations.Placement techniques play a crucial role in mitigating microleakage.Bulk-fill techniques, while time-efficient, often result IntroductIonEsthetic dental treatment has become the most important concern of patients today. 1 Dentistry focuses on removing bacterial and diseased tissue, and restoring tooth function and esthetics through appropriate restorative materials. 2 In class V restorations, microleakage remains a significant issue, particularly since the gingival margins are often placed on dentin or cementum.Due to its low mineral content and complex structure, it is more difficult to bond to the dentin surface than to enamel. 3 Various factors influence microleakage, including cavity shape, restorative materials, and placement techniques, all of which aim to lower the configuration factor (C-factor) to minimize stress due to polymerization shrinkage. 4Though many approaches have been tested for restoring the cervical restorations, discrepancies in outcomes exist due to differences in material composition, techniques, and absence of standardization in evaluation. 5 The introduction of thermocycling and dye penetration techniques has further enhanced the evaluation of microleakage under simulated oral conditions. 6icrohybrid (G-aenial Posterior, GC, Tokyo, Japan), a nano-hybrid resin, is known for its superior handling characteristics and reduced polymerization shrinkage.Similarly, giomer (Beautiful II, Shofu Inc, Japan), a giomer-based composite, exhibits fluoride-releasing properties and enhanced marginal adaptability.