Estimation of the Gingival Microleakage of Two Composite Resins with Three Insertion Techniques for Class V Restorations (In-vitro Comparative Study)

Objective: Evaluating the marginal microleakage of two different composite resins with three different restorative techniques in class V cavities with the cervical margins within the cementoenamel junction. Methods: Sixty standardized box-shaped class V cavities of 2×2×3 mm (depth, length, width) prepared on the buccal and lingual surfaces of 30 freshly extracted healthy human premolars. The teeth randomly divided into two equal groups: group A (Filtek™ Z250 XT) and group B (Beautifil™ II LS giomer). Then each group is subdivided into 3 equal subgroups: group Ⅰ (bulk technique-10 cavities), group Ⅱ ( split horizontal technique-10 cavities) and group Ⅲ (vertical technique-10 cavities) and filled according to the manufacturer’s instructions. The samples were subjected to thermocycling (5°C ±2°C & 55°C ±2°C with a 30 seconds dwell time) and immersed in 2% buffered Methylene blue solution at 37°C for 24 hours. The restorations were sectioned longitudinally in buccolingual direction through the centers of the restoration. Then evaluated for microleakage using a stereomicroscope at 10x magnification and scored as 0, 1, 2, and 3. Non-parametric Mann-Whitney and Kruskal-Wallis tests we