TY - JOUR
T1 - Defying ageing
T2 - An expectation for dentine bonding with universal adhesives?
AU - Zhang, Zheng yi
AU - Tian, Fucong
AU - Niu, Li na
AU - Ochala, Kirsten
AU - Chen, Chen
AU - Fu, Bai ping
AU - Wang, Xiao yan
AU - Pashley, David Henry
AU - Tay, Franklin Chi Meng
N1 - Funding Information:
This work was supported by grant R01 DE015306-06 from NIDCR , grant 2015AA020942 from National High Technology Research and Development Program of China , grant 81400555 from NSFC , grant 2015JM838 3 from Natural Science Basic Research Plan in Shaanxi Province of China and program IRT13051 from PCSIRT .
Publisher Copyright:
© 2015 Elsevier Ltd
PY - 2016/2/1
Y1 - 2016/2/1
N2 - Objectives The present study evaluated the long-term dentine bonding effectiveness of five universal adhesives in etch-and-rinse or self-etch mode after 12 months of water-ageing. Methods The adhesives evaluated included All-Bond Universal, Clearfil Universal Bond, Futurabond U Prime&Bond Elect and Scotchbond Universal. Microtensile bond strength and transmission electron microscopy of the resin-dentine interfaces created in human coronal dentine were examined after 24 h or 12 months. Results Microtensile bond strength were significantly affected by bonding strategy (etch-and-rinse vs self-etch) and ageing (24 h vs 12 months). All subgroups showed significantly decreased bond strength after ageing except for Prime&Bond Elect and Scotchbond Universal used in self-etch mode. All five adhesives employed in etch-and-rinse mode exhibited ultrastructural features characteristic of collagen degradation and resin hydrolysis. A previously-unobserved inside-out collagen degradation pattern was identified in hybrid layers created by 10-MDP containing adhesives (All-Bond Universal, Scotchbond Universal and Clearfil Universal Bond) in the etch-and-rinse mode, producing partially degraded collagen fibrils with intact periphery and a hollow core. In the self-etch mode, all adhesives except for Prime&Bond Elect exhibited degradation of the collagen fibrils along the thin hybrid layers. The three 10-MDP containing universal adhesives did not protect surface collagen fibrils from degradation when bonding was performed in the self-etch mode. Conclusions Despite the adjunctive conclusion that bonds created by universal adhesives in the self-etch bonding mode are more resistant to decline in bond strength when compared with those bonds created using the etch-and-rinse mode, bonds created by universal adhesives are generally incapable of defying ageing.
AB - Objectives The present study evaluated the long-term dentine bonding effectiveness of five universal adhesives in etch-and-rinse or self-etch mode after 12 months of water-ageing. Methods The adhesives evaluated included All-Bond Universal, Clearfil Universal Bond, Futurabond U Prime&Bond Elect and Scotchbond Universal. Microtensile bond strength and transmission electron microscopy of the resin-dentine interfaces created in human coronal dentine were examined after 24 h or 12 months. Results Microtensile bond strength were significantly affected by bonding strategy (etch-and-rinse vs self-etch) and ageing (24 h vs 12 months). All subgroups showed significantly decreased bond strength after ageing except for Prime&Bond Elect and Scotchbond Universal used in self-etch mode. All five adhesives employed in etch-and-rinse mode exhibited ultrastructural features characteristic of collagen degradation and resin hydrolysis. A previously-unobserved inside-out collagen degradation pattern was identified in hybrid layers created by 10-MDP containing adhesives (All-Bond Universal, Scotchbond Universal and Clearfil Universal Bond) in the etch-and-rinse mode, producing partially degraded collagen fibrils with intact periphery and a hollow core. In the self-etch mode, all adhesives except for Prime&Bond Elect exhibited degradation of the collagen fibrils along the thin hybrid layers. The three 10-MDP containing universal adhesives did not protect surface collagen fibrils from degradation when bonding was performed in the self-etch mode. Conclusions Despite the adjunctive conclusion that bonds created by universal adhesives in the self-etch bonding mode are more resistant to decline in bond strength when compared with those bonds created using the etch-and-rinse mode, bonds created by universal adhesives are generally incapable of defying ageing.
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U2 - 10.1016/j.jdent.2015.11.008
DO - 10.1016/j.jdent.2015.11.008
M3 - Article
C2 - 26655173
AN - SCOPUS:84975733519
SN - 0300-5712
VL - 45
SP - 43
EP - 52
JO - Journal of Dentistry
JF - Journal of Dentistry
ER -