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Water Aging Reverses Residual Stresses in Hydrophilic Dental Composites

Authors
 J.W. Park  ;  J.L. Ferracane 
Citation
 JOURNAL OF DENTAL RESEARCH, Vol.93(2) : 195-200, 2014 
Journal Title
 JOURNAL OF DENTAL RESEARCH 
ISSN
 0022-0345 
Issue Date
2014
MeSH
Absorption ; Adsorption ; Compomers/chemistry ; Composite Resins/chemistry* ; Dental Materials/chemistry* ; Elastic Modulus ; Humans ; Hydrophobic and Hydrophilic Interactions ; Materials Testing ; Methacrylates/chemistry ; Polymerization ; Polyurethanes/chemistry ; Resin Cements/chemistry ; Solubility ; Stress, Mechanical ; Surface Properties ; Time Factors ; Water/chemistry*
Keywords
dimensional change ; expansion ; ring-slitting method ; self-adhesive resin cement ; water solubility ; water sorption
Abstract
Dental composites develop residual stresses during polymerization due to shrinkage. These stresses may change with time because of relaxation and water sorption in the oral environment. This phenomenon is likely dependent on the composition of the materials, specifically their hydrophilic characteristics, and could result in deleterious stresses on restorative materials and tooth structure. The purpose of this experiment was to use the thin ring-slitting method to compare the residual stress generated within composite materials of varying hydrophilicity when aged in wet and dry conditions after polymerization. Water sorption, solubility, elastic modulus, and residual stresses were measured in 6 commercial composites/cements aged in water and dry conditions. The self-adhesive resin cement showed the highest water sorption and solubility. All composites showed initial residual contraction stresses, which were maintained when aged dry. Residual stresses in 2 of the self-adhesive cements and the polyacid-modified composite aged in wet conditions resulted in a net expansion. This experiment verified that residual shrinkage stresses in dental composites can be reversed during aging in water, resulting in a net expansion, with the effect directly related to their hydrophilic properties.
Full Text
http://jdr.sagepub.com/content/93/2/195.long
DOI
10.1177/0022034513513905
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
Yonsei Authors
Park, Jeong Won(박정원) ORCID logo https://orcid.org/0000-0002-2517-8150
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/98203
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