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

Authors
 Seung-Hoon Han  ;  Alireza Sadr  ;  Junji Tagami  ;  Sung-Ho Park 
Citation
 DENTAL MATERIALS, Vol.32(9) : 1085-1094, 2016 
Journal Title
DENTAL MATERIALS
ISSN
 0109-5641 
Issue Date
2016
MeSH
Composite Resins* ; Humans ; Materials Testing ; Polymerization*
Keywords
C-factor ; Compliance ; Composite resin ; Correlation ; Internal adaptation ; Optical coherence tomography ; Polymerization shrinkage ; Polymerization stress ; SS-OCT
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 3mm in diameter were prepared in 100 human third molars in two depths: 4mm high C-factor (H-CF) or 1mm 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 (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
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.
Full Text
http://www.sciencedirect.com/science/article/pii/S0109564116300835
DOI
10.1016/j.dental.2016.06.005
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Park, Sung Ho(박성호) ORCID logo https://orcid.org/0000-0003-2171-235X
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/151718
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