Internal adaptation of resin composites at two configurations: Influence of polymerization shrinkage and stress. Issue 9 (September 2016)

• Record Type: Journal Article
• Authors: Han, Seung-Hoon; Sadr, Alireza; Tagami, Junji; Park, Sung-Ho
• Is Part Of: Dental materials. Volume 32:Issue 9(2016)
• Page Start: 1085
• Page End: 1094
• Publication Date: 2016-09
• Subjects: Internal adaptation -- Composite resin -- C-factor -- Polymerization shrinkage -- Polymerization stress -- Compliance -- Correlation -- SS-OCT -- Optical coherence tomography; Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2016.06.005
• Languages: English
• ISSNs: 0109-5641

Abstract

Highlights: 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 resin materials. Polymerization stress under the compliance-allowed condition showed significant correlations with internal adaptations in high and low C-factor cavities. Polymerization stress under the zero-compliance condition did not show a significant correlation with internal adaptation in the low C-factor cavity. Abstract: 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, 3 M 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 (PS0) 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 PS0 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.