Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction.

Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Research Abstract Details 

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Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Abstract Text:

Kusai Baroudi,Abeer M Saleh,Nick Silikas,David C Watts,

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.

Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Publishing Authors By Initials

K Baroudi,AM Saleh,N Silikas,DC Watts,

For similar biomechanics: stress, mechanical research abstracts see: biomechanics: stress, mechanical research

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Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of dentistry

VOLUME: 35

Page Numbers: 651-5

Journal Abbreviation:

ISSN: 0300-5712

DAY: 26

MONTH: 06

YEAR: 2007

Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Information

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LANGUAGE: eng

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Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Keywords Mesh Terms:

KEYWORDS: Stress, Mechanical

MESH TERMS: chemistry

Chemical & Substance for Abstract: Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction. Information

Substance Name: flowable hybrid composite

Registry Number: 0

Grant and Affiliation Information for Shrinkage behaviour of flowable resin-composites related to conversion and filler-fraction.

AFFILIATION: Department of Paediatric Dentistry, University of Al-Baath, School of Dentistry, Hama, Syria. d_kusai@yahoo.co.uk

Country: England

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MEDLINETA: J Dent

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