Anupriya Bugalia1, Yujvender2, Neha Bramta3, Jitin Kharbanda4, Mansi Atri5, Gaurav Kharbanda6
AIM: The aim of this study was to evaluate effect of placement techniques, flow able composite, and fiber inserts in marginal adaptation of class II composite restorations. MATERIALS AND METHODS: 120 class II box cavities were prepared on both mesial and distal surfaces of extracted human molars. The prepared teeth were randomly assigned to 6 groups: 1) bulk insertion. (Single increment), 2) Oblique incremental placement technique, 3) Centripetal incremental placement technique. 4) Split horizontal incremental placement technique. 5) flow able composite as gingival increment 6) ribbond fiber insert in gingival increment. The preparations were restored with a total etch adhesive (Adper Single Bond, 3M ESPE) and nano composite (Z350, 3M ESPE). Specimens were isolated with nail varnish except for a 2-mm-wide rim around the restoration and thermocycled (1,000 thermal cycles, 5°C/55°C; 30-second dwell time). The specimens were immersed in a solution of 2% methylene blue dye for 24 hours. The teeth were sectioned longitudinally, observed under stereomicroscope and evaluated for microleakage using an ordinal scale of 0 to 4. The microleakage scores obtained from gingival walls were analyzed with Kruskal-Wallis and Mann Whitney nonparametric tests.
RESULTS: Among all placement techniques split incremental technique showed least microleakage scores. The group that used flowable composite liner did not show significant reduction in microleakage and group with fiber inserts showed significant decrease in microleakage scores.
CONCLUSION: None of the techniques eliminated marginal microleakage in class II composite restorations. However, the split incremental technique and group with fiber inserts showed significantly lower microleakage at gingival margin when compared to other groups.
