Bulk vs wedge shape layering techniques in V class cavities: marginal infiltration evaluation

The aim of this in vitro research was to assess if the different stratification techniques could influence the marginal gap in V class restoration. Standard 6×4×4mm class V cavities were prepared on the buccal side of 24 extracted sound human premolars. Specimens were randomly divided in two groups: (A) Bulk filling technique; (B) Wedge-shape layering technique. The interfacial sealing ability of the stratification techniques was evaluated by scoring the 7% methylene blue penetration depth through optical microscope observations. The infiltration assessment was performed with a progressive score. Differences in infiltration scores recorded for the tested techniques were evaluated for statistical significance (Mann–Whitney U test, p