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Shear bond strength to dentine of dental adhesives containing hydroxyapatite nano-fillers
The aim of this study was to compare the effect of hydroxyapatite (HAP) nano-rods (HAP rods ) and HAP nano-sticks (HAP sticks ) added to commercial adhesives on the macro-shear bond strength (SBS) to dentine and morphology of the adhesive-dentine interface. HAP was added to Single Bond Universal (SB...
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Published in: | Journal of adhesion science and technology 2016-12, Vol.30 (24), p.2678-2689 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The aim of this study was to compare the effect of hydroxyapatite (HAP) nano-rods (HAP
rods
) and HAP nano-sticks (HAP
sticks
) added to commercial adhesives on the macro-shear bond strength (SBS) to dentine and morphology of the adhesive-dentine interface. HAP was added to Single Bond Universal (SBU, 3M ESPE) and Te-Econom Bond (TeE; Ivoclar Vivadent), in the form of water suspensions to avoid agglomeration of nano-particles and to achieve HAP concentrations of 0.5, 1.0 and 1.5 wt%. Following a 'total-etch' or a 'self-etch' protocol, the adhesives were applied to flat dentine surface of 162 intact human, third molars (N = 6/group). Composite (Z250, 3M ESPE) was built-up using a split stainless steel mould, 3 mm in diameter. SBS was tested using a universal testing machine at 1 mm/min until fracture. Data were statistically analysed using two-way and one-way analysis of variance with Tukey's post-test (α = 0.05). HAP
rods
had no significant effect on SBS of the tested adhesives while HAP
sticks
improved bond strength to dentine only of adhesives applied following the 'total-etch' total-etch protocol. SBS values of SBU containing 1% HAP
sticks
(15.10 ± 2.96 MPa) and TeE containing 0.5% HAP
sticks
applied following the total-etch protocol (12.96 ± 4.48 MPa) were higher than those of their respective control groups (10.36 ± 2.68 and 7.97 ± 3.64 MPa). Samples with higher SBS showed more 'mixed' failures. HAP nano-fillers may improve bond strength of total-etch adhesives without an adverse effect on adhesive dispersion on dentine and its ability to infiltrate dentinal tubules. |
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ISSN: | 0169-4243 1568-5616 |
DOI: | 10.1080/01694243.2016.1197086 |