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How degree of conversion and E-modulus of light-cure dental-resins interact
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-8676-8819
2006 (English)In: 84th General Session and Exhibition of the IADR and 1st Meeting of the Pan-Asian-Pacific Federation: Brisbane Convention and Exhibition Centre, Brisbane, Queensland (Australia), 28 Jun-1 Jul 2006, IADR , 2006Conference paper, Meeting abstract (Other academic)
Abstract [en]

Objectives: To investigate how E-modulus, degree of conversion (DC%) and rate of polymerization of the most used monomer resins in dental light-cure composites interact. Methods: Young's modulus and DC% were studied for 21 different resin combinations of three commonly used dental monomers, bis-GMA, TEGDMA and UEDMA (combinations of 0, 20, 40, 60 and 100 wt% as it is illustrated in the figure). For each resin combination 6 specimens were tested. Small Instron and differential scanning calorimetry (photo-calorimetry) were used as testing machines. The results were tested using ANOVA and Duncan's multiple range tests and regular t-test. Results: Rate of polymerization was significantly (p<0.05) higher when the wt% of the TEGDMA was high in the mixtures compare to highly concentrated bis-GMA. DC% was significantly high (p<0.05) for binary mixture of UEDMA and TEGDMA. The DC% was significantly lower for 100 wt% bis-GMA (p<0.05). The calculated values for DC% were between 53.1%± 0.9% and 85.6%±1%. Young's modulus values varied between 2.37± 0.15 GPa and 4.15± 0.2 GPa. It was noticeable that by adding TEGDMA to bisGMA or UEDMA, the Young's modulus decreased significantly (p<0.05). There were no significant (p>0.05) differences between Young's modulus values when the monomer mixtures contained bis-GMA, TEGDMA and UEDMA at different concentration levels. The higher the concentration of bisGMA in the monomer mixture, the lower was the degree of conversion. However, Young's modulus increased at higher concentration of bis-GMA. Conclusions: The differences in the values for degree of conversion were mostly justified by the differences in the molecular structures of the different monomers. It was also revealed that higher degree of conversion does not always result in a higher Young's modulus, because molecular and network structural parameters play major roles in the final mechanical/physical properties of the mixtures.

Place, publisher, year, edition, pages
IADR , 2006.
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-26958Local ID: 03ccb0d0-42ab-11dd-bfd7-000ea68e967bOAI: oai:DiVA.org:ltu-26958DiVA, id: diva2:1000139
Conference
General Session and Exhibition of the IADR and 1st Meeting of the Pan-Asian-Pacific Federation : 28/06/2006 - 01/07/2006
Note
Godkänd; 2006; 20080625 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-08Bibliographically approved

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http://iadr.confex.com/iadr/2006Brisb/techprogram/abstract_83608.htm

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Emami, Nazanin

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