The Use of self-adhering flowable composite as immediate dentine sealing material, in vitro study

Abstract

Objectives: To investigate the use of self-adhering flowable composite and universal adhesive for immediate dentine sealing technique (IDS) under simulated pulpal pressure. Methods: Thirty permanent third molars were divided into three subgroups according to IDS technique: one-layer IDS with universal adhesive (U), one-layer IDS with self- adhering flowable composite (F) and two-layer IDS with universal adhesive with self- adhering flowable composite (UF). They were tested under two conditions: simulated and non-simulated pulpal pressure (PP, NP). The pulpal chamber in the PP group was subjected to a hydrostatic pressure of 20 cmH2O throughout the experiment. After IDS application, self-adhesive resin cement was employed to attach a composite rod to the treated dentine. Ten small beams from each group were randomly selected to investigate μTBS, mode of failure, and examine the ultrastructure of the bonding interface. Result: The μTBS of the non-simulated pulpal pressure group was significantly greater than that of the pulpal pressure group. The F-NP group yielded the highest μTBS, followed by the UF-NP and U-NP groups. While the F-PP and UF-PP groups provided comparable μTBS and significantly higher than the U-PP group. Conclusion: One-layer IDS using self-adhering flowable composite showed higher μTBS than one-layer IDS using universal adhesive and two-layer using universal adhesive and self-adhering flowable composite in both simulated and non-simulated pulpal conditions. Keywords: Pulpal pressure, self-adhering flowable composite, immediate dentine sealing.