Formation of gaps at the filler-resin interface induced by polymerization contraction stress: Gaps at the interface

Dental Materials : Official Publication of the Academy of Dental Materials
Li FengA C Shortall

Abstract

To investigate the movement of resin matrix with respect to the filler particles of filled composites during their photo cure without or with polymerization contraction stress (PCS). Two types of composites were prepared. Glass beads as macroscopic fillers were placed into the center of a bis-GMA/TEGDMA resin to make single bead-embedding "composites" and a variety of fillers of different compositions, sizes, and shapes were mixed with another bis-GMA/TEGDMA resin to make lightly filled composites. They were photo cured in a cavity constructed with an acrylic or aluminum ring sitting on a polyester strip. Bonding to the ring constrained the polymerization shrinkage and thus produced a PCS. The formation of gaps between the filler and the resin was detected by optical microscopy for the glass bead-resin systems, and by light attenuation and scanning electron microscopy (SEM) for the filler-resin composites. In general, for composites with untreated fillers, the optical microscopy and SEM revealed gaps at the filler-resin interface only when they were cured under constrained shrinkage conditions. These composites attenuated more light when cured under constrained shrinkage conditions than when under non-constrained conditions. Fo...Continue Reading

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Citations

Jan 15, 2014·Clinical Oral Investigations·Stefan Bucuta, Nicoleta Ilie
Dec 4, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Julian G LeprinceGaetane Leloup
Sep 6, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Mohammed A HadisWilliam M Palin
May 23, 2013·Journal of Dental Research·U LohbauerJ L Ferracane
Jul 22, 2017·Journal of Dental Research·A P P Fugolin, C S Pfeifer
Dec 8, 2017·Brazilian Dental Journal·Victor Hugo GrandiRicardo Danil Guiraldo
Jul 18, 2019·Microscopy Research and Technique·Melissa A RuivoMarcelo Giannini
Nov 19, 2013·Dental Materials Journal·Takako YoshikawaJunji Tagami
Feb 21, 2019·Scientific Reports·Ana P FugolinCarmem S Pfeifer
Feb 13, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Parag K Shah, Jeffrey W Stansbury
Apr 9, 2021·Scientific Reports·Ana Paula Piovezan FugolinCarmem Silvia Pfeifer
Mar 2, 2019·Dental Materials : Official Publication of the Academy of Dental Materials·Juri HayashiAlireza Sadr

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