Flury, Simon; Peutzfeldt, Anne; Lussi, Adrian (2014). Influence of increment thickness on microhardness and dentin bond strength of bulk fill resin composites. Dental materials, 30(10), pp. 1104-1112. Elsevier 10.1016/j.dental.2014.07.001
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OBJECTIVES
To investigate the influence of increment thickness on Vickers microhardness (HV) and shear bond strength (SBS) to dentin of a conventional and four bulk fill resin composites.
METHODS
HV and SBS were determined on specimens of the conventional resin composite Filtek Supreme XTE (XTE) and the bulk fill resin composites SDR (SDR), Filtek Bulk Fill (FBF), x-tra fil (XFIL), and Tetric EvoCeram Bulk Fill (TEBF) after 24h storage. HV was measured either as profiles at depths up to 6mm or at the bottom of 2mm/4mm/6mm thick resin composite specimens. SBS of 2mm/4mm/6mm thick resin composite increments was measured to dentin surfaces of extracted human molars treated with the adhesive system OptiBond FL, and the failure mode was stereomicroscopically determined at 40× magnification. HV profiles and failure modes were descriptively analysed whereas HV at the bottom of resin composite specimens and SBS were statistically analysed with nonparametric ANOVA followed by Wilcoxon rank sum tests (α=0.05).
RESULTS
HV profiles (medians at 2mm/4mm/6mm): XTE 105.6/88.8/38.3, SDR 34.0/35.5/36.9, FBF 36.4/38.7/37.1, XFIL 103.4/103.9/101.9, TEBF 63.5/59.7/51.9. HV at the bottom of resin composite specimens (medians at 2mm/4mm/6mm): XTE (p<0.0001) 105.5>85.5>31.1, SDR (p=0.10) 25.8=21.9=26.0, FBF (p=0.16) 26.6=25.3=28.9, XFIL (p=0.18) 110.5=107.2=101.9, TEBF (p<0.0001) 63.0>54.9>48.2. SBS (MPa, medians at 2mm/4mm/6mm): XTE (p<0.0001) 23.9>18.9=16.7, SDR (p=0.26) 24.6=22.7=23.4, FBF (p=0.11) 21.4=20.3=22.0, x-tra fil (p=0.55) 27.0=24.0=23.6, TEBF (p=0.11) 21.0=20.7=19.0. The predominant SBS failure mode was cohesive failure in dentin.
SIGNIFICANCE
At increasing increment thickness, HV and SBS decreased for the conventional resin composite but generally remained constant for the bulk fill resin composites.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry |
UniBE Contributor: |
Flury, Simon, Peutzfeldt, Anne, Lussi, Adrian |
Subjects: |
600 Technology > 610 Medicine & health |
ISSN: |
0109-5641 |
Publisher: |
Elsevier |
Language: |
English |
Submitter: |
Simon Flury |
Date Deposited: |
14 Oct 2014 11:16 |
Last Modified: |
05 Dec 2022 14:36 |
Publisher DOI: |
10.1016/j.dental.2014.07.001 |
PubMed ID: |
25086481 |
Uncontrolled Keywords: |
Dentin bonding, Depth of cure, Light-curing, Posterior restorative, Surface hardness |
BORIS DOI: |
10.7892/boris.57609 |
URI: |
https://boris.unibe.ch/id/eprint/57609 |
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