Universal adhesives and dual-cured core buildup composite material: adhesive properties

Abstract

Universal adhesives and dual-cured core buildup composite material: adhesive properties Dual-cured buildup composites and simplified light-cured adhesive systems are mixed with a chemical activator to prevent the incompatibility between them. Objective: To evaluate microshear bond strength (μSBS) and nanoleakage (NL) of three universal adhesives used under buildup composites using different curing modes, at baseline and after 6-months (6m). Methodology: Dentin specimens of 55 molars were assigned to: Clearfil Universal Bond[CFU], Prime&Bond Elect[PBE] and One Coat 7 Universal[OCU]. All-Bond Universal[ABU] and Adper Scotchbond Multi-Purpose[SMP] were used as controls. CFU, PBE, and OCU were: light-cured [LC], dual-cured using a self-curing activator [DC], and self-cured, using a self-curing activator and waiting for 20 min [SC]. Upon the application of the adhesive, transparent matrices were filled with a dual-cured buildup composite and light cured, then tested in mSBS. For NL, the specimens were submersed in ammoniacal silver nitrate and sectioned to observe under the SEM. Three-way ANOVA and Tukey's test were applied (α=0.05

Influence of geometric dimensions on early failures of adhesively retained composite resin core build‐ups

“…Strategies in this regard are the development of so-called selfcure activators to be admixed with the self-etch primer and self-or dual-curing composites with acid-resistant redox initiators. [25][26][27] A recent randomized controlled study attested that early failures of core build-ups made from different composite resin materials are manageable-confirming the findings of previous studies-and no difference in failure became obvious between those used in combination with total-etch and all-in-one technique. 28 However, results also indicated an effect of operator experience and size of core build-ups as expressed by the number of restored surfaces which is in one line with a study from the middle 2000s.…”

“…This is a problem that has now been recognized and has prompted the industry to focus on improving the compatibility of corresponding adhesives. Strategies in this regard are the development of so‐called self‐cure activators to be admixed with the self‐etch primer and self‐ or dual‐curing composites with acid‐resistant redox initiators 25–27 . A recent randomized controlled study attested that early failures of core build‐ups made from different composite resin materials are manageable—confirming the findings of previous studies—and no difference in failure became obvious between those used in combination with total‐etch and all‐in‐one technique 28 .…”