title: Depth of cure of contemporary bulk-fill resin-based composites.
abstract: This study evaluated the depth of cure (DOC) of packable and flowable bulk-fill resin-based composites (RBCs) including PRG (prereacted glass ionomer) and short-fiber materials. The materials were placed in a black split-mold with a 7 mm deep recess and cured at 700 mW/cm(2) for 20 s using a LED curing light. DOC was assessed using the ISO scraping and Knoops hardness tests. Data (n=5) were computed and analyzed using one-way ANOVA/Scheffe's post hoc test (p<0.05). ISO DOC ranged from 3.66 to 2.54 mm while DOC based on hardness testing ranged from 3 to 1.5 mm. For all materials, a decrease in hardness was observed with increasing depths. The DOC of bulk-fill RBCs was product dependent and greater than standard composites. At 4 mm depth, none of the bulk-fill RBCs had a depth: top hardness ratio of 0.8 and above.
authors.affiliation: Faculty of Dentistry, National University of Singapore.
authors.forename: Adrian U Jin
authors.initials: AU
authors.lastname: Yap
authors.forename: Mirali
authors.initials: M
authors.lastname: Pandya
authors.forename: Wei Seong
authors.initials: WS
authors.lastname: Toh
mesh_terms: D003188:Composite Resins; D006244:Hardness; D006245:Hardness Tests; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing
chemical_list: D003188:Composite Resins