Adaptability of thermo-viscous versus sonicfill-activated bulk fill composite resin restorations

Abstract

Purpose To in vitro evaluate the marginal and internal adaptation of Thermo-Viscous versus SonicFill Bulk Fill composite in Class I cavities. Materials and methods Twenty non-carious human maxillary premolar teeth were selected. Class I cavities were prepared with dimensions of 4 mm mesio-distal, 2.5 mm bucco-lingual width and 2 mm depth. Specimens were randomly divided into two equal groups I and II. Cavities were restored with VisCalor and SonicFill Bulk Fill, respectively. Materials were applied using the recommended adhesive and special dispenser. Specimens were then subjected to 500 thermal cycles, labelled and the restoration margins were inspected under stereomicroscope at X70 to detect and measure the marginal gap width. Specimen were then sectioned buccolingually using a microtome to detect and measure the internal gap width. Results Lower mean values of marginal gap width were recorded in VisCalor group compared to SonicFill group, however there was no statistically significant difference (P = 0.187) between both groups. While a significant difference (P = 0.002) was found regarding internal mean gap width values recorded in VisCalor group compared to SonicFill group. Conclusion Both tested materials/techniques used to reduce the viscosity of the bulk fill composites presented nearly comparable marginal integrity results, while VisCalor application technique enhanced the internal adaptation compared to SonicFill method.