Internal adaptation of resin composites at two configurations: Influence of polymerization shrinkage and stress

Objective. This study compared internal adaptation of composites under different C-factors and examined the relationship between internal adaptation and polymerization shrinkage parameters. Methods. Cylindrical cavities 3 mm in diameter were prepared in 100 human third molars in two depths: 4 mm high C-factor (H-CF) or 1 mm low C-factor (L-CF). After adhesive application (Clearfil SE One, Kuraray Noritake), the composite was placed in two increments in three subgroups: Filtek Supreme (FS, 3M ESPE); Charisma Diamond (CD, Heraeus Kulzer); Amelogen Plus (AP, Ultradent); and as a single increment in two subgroups: Tetric EvoCeram Bulk Fill (TB, Ivoclar Vivadent) and Venus Bulk Fill (VB, Heraeus Kulzer). After thermo-mechanical load-cycles, imperfect margin percentage (%IM) was calculated using swept-source optical coherence tomography (SS-OCT) imaging. The relationships between %IM and linear shrinkage (LS) and shrinkage stress, measured under either zero-compliance (PSO) or compliance-allowed (PS) conditions were evaluated. Results. The %IM was significantly different between H-CF and L-CF groups. The %IM in H-CF turned out to be as groups CD, FS <= TB < AP, VB. The %IM in L-CF showed as groups CD, TB <= FS, AP < VB. There were significant correlations between shrinkage parameters and %IM, except between PSO and %IM in L-CF. Significance. Internal adaptation in a high C-factor cavity was inferior to that in a low C-factor cavity for both conventional and bulk-filled composites. Internal adaptation, polymerization shrinkage, and stress were different among composite materials. Polymerization stress under the compliance-allowed condition showed significant correlations with internal adaptations in high and low C-factor cavities. (C) 2016 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.