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Faculty of Dentistry
Document Details
Document Type
:
Article In Journal
Document Title
:
Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction
Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction
Document Language
:
English
Abstract
:
OBJECTIVES: To evaluate the shrinkage-strain, degree of conversion (DC) and percent filler of a range of flowable resin-composites. METHODS: Several commercially available flowable resin-composites were selected. The bonded-disk technique was used to measure shrinkage-strain kinetics. Measurements were obtained continuously for 60min by irradiation for 40s at 750mW/cm(2) at two initial temperatures of 23 and 37 degrees C. Three repetitions (n=3) were made at each temperature per material. The DC was measured by FTIR spectroscopy immediately post-cure. The percent filler was determined by combustion of specimens for 1h at 400 degrees C. RESULTS: The final values of shrinkage-strain ranged from 2.61 to 6.25% at 23 degrees C and from 3.88 to 6.56% at 37 degrees C. Statistically significant differences (p<0.05) were found in shrinkage-strain between the flowable resin-composites at both temperatures 23 and 37 degrees C. Significantly higher values were obtained at 37 degrees C (p<0.05). A strong inverse correlation was found between the percent filler and the shrinkage-strain at 37 and 23 degrees C (r(2)=0.94 and 0.87, respectively). No correlation was found between shrinkage-strain and DC (p>0.05). CONCLUSIONS: Flowable resin-composites vary widely in shrinkage-strain magnitude and the inverse relationship between filler percent and shrinkage-strain is explained by the corresponding decrease in volume fraction of monomers present to undergo polymerisation.
ISSN
:
1
Journal Name
:
J Dent
Volume
:
35
Issue Number
:
8
Publishing Year
:
1427 AH
2007 AD
Article Type
:
Article
Added Date
:
Monday, May 30, 2011
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
عبير صالح
Saleh, Abeer
Researcher
Doctorate
Files
File Name
Type
Description
29809.pdf
pdf
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