Document Detail

Polymerization shrinkage-strain kinetics of temporary crown and bridge materials.
MedLine Citation:
PMID:  14698778     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to measure the polymerization shrinkage kinetics of four commercially available polymer-based temporary crown and bridge materials, including the effect of ambient temperature. METHODS: Three dimethacrylate-based materials and one monomethacrylate-based material were investigated. The polymerization shrinkage-strains were measured by using the Bonded-disk method with initial specimen temperature at both 23 and 37 degrees C, with values particularly noted at 5, 10, and 120 min after mixing. Five recordings were taken for each material. The progress of the setting reaction and its temperature-dependence were evaluated by the kinetic curves, and net shrinkage and total shrinkage (inclusive of expansion magnitude) of each material were compared by independent sample t-test and one-way ANOVA. RESULTS: Most shrinkage occurred in the first 10 min after mixing although there was an early expansion especially with the monomethacylate in the first 5 min. At 120 min, the net shrinkage-strain at 23 and 37 degrees C of the materials used in this test ranged from 3.54 to 4.13%. The fastest setting dimethacrylate-based material and the monomethacrylate-based material showed higher shrinkage-strain than other materials. No significant differences of net shrinkage-strain were found between 23 and 37 degrees C, but higher shrinkage rates were measured at 37 degrees C than at 23 degrees C. SIGNIFICANCE: The Bonded-disk method is a suitable method for measuring temperature-dependence of shrinkage-strain of polymer-based temporary materials. The dimethacrylate-based materials are preferable to monomethacrylates for temporary restoration as judged by the magnitude of polymerization shrinkage-strain, the majority of which is apparent within 10 min from the start of mixing and may affect the clinical outcome.
S H Kim; D C Watts
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  20     ISSN:  0109-5641     ISO Abbreviation:  Dent Mater     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-30     Completed Date:  2004-03-30     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  88-95     Citation Subset:  D    
Biomaterials Science Unit, Department of Restorative Dentistry, University of Manchester Dental School, Higher Cambridge Street, Manchester M15 6FH, UK.
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MeSH Terms
Acrylic Resins / radiation effects
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate / radiation effects
Composite Resins / radiation effects
Dental Marginal Adaptation
Dental Restoration, Temporary*
Dental Stress Analysis / instrumentation,  methods
Denture, Partial, Fixed*
Hot Temperature
Materials Testing
Methacrylates / radiation effects
Polymers / chemistry
Polymethacrylic Acids / radiation effects
Polymethyl Methacrylate / chemistry*
Statistics, Nonparametric
Time Factors
Reg. No./Substance:
0/Acrylic Resins; 0/Composite Resins; 0/Methacrylates; 0/Polymers; 0/Polymethacrylic Acids; 0/Temphase; 0/luxatemp; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 39341-43-0/Snap (resin); 9011-14-7/Polymethyl Methacrylate; 94362-98-8/Protemp

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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