TY - JOUR
T1 - Ultrastructure and bonding properties of tribochemical silica-coated zirconia
AU - Nagaoka, Noriyuki
AU - Yoshihara, Kumiko
AU - Tamada, Yoshiyuki
AU - Yoshida, Yasuhiro
AU - Meerbeek, Bart Van
N1 - Funding Information:
This work was supported by a JSPS KAKENHI Grant (Number JP 18K1706800, 16K2045508, 15K1115807). The authors declare that they have no conflict of interest regarding this research.
Publisher Copyright:
© 2019, Japanese Society for Dental Materials and Devices. All Rights Reserved.
PY - 2019
Y1 - 2019
N2 - Tribochemical silica coating (TSC) is commonly used to pretreat zirconia surfaces prior to luting. Although many studies demonstrate an adhesion-promoting effect of TSC on zirconia, its actual interaction mechanism has not been fully elucidated. We therefore characterized the ultrastructure of TSC-treated zirconia and tested shear-bond strength. STEM/EDS disclosed a micro-roughened zirconia surface partially covered with fused Al and Si, while residual unfused silica particles could also still be detected. TSCtreated zirconia having received the solely silane primer exhibited a significantly lower shear-bond strength than zirconia on which the combined 10-MDP/silane primer was applied. SEM fracture analysis revealed residual silica particles on both the zirconia and cement sides. Correlative ultrastructural and chemical surface characterization revealed that TSC deposited an inhomogeneous silica layer on the zirconia surface, which explains why the solely silane coupling agent was less effective than the combined 10-MDP/ silane ceramic primer for bonding to zirconia pretreated by TSC.
AB - Tribochemical silica coating (TSC) is commonly used to pretreat zirconia surfaces prior to luting. Although many studies demonstrate an adhesion-promoting effect of TSC on zirconia, its actual interaction mechanism has not been fully elucidated. We therefore characterized the ultrastructure of TSC-treated zirconia and tested shear-bond strength. STEM/EDS disclosed a micro-roughened zirconia surface partially covered with fused Al and Si, while residual unfused silica particles could also still be detected. TSCtreated zirconia having received the solely silane primer exhibited a significantly lower shear-bond strength than zirconia on which the combined 10-MDP/silane primer was applied. SEM fracture analysis revealed residual silica particles on both the zirconia and cement sides. Correlative ultrastructural and chemical surface characterization revealed that TSC deposited an inhomogeneous silica layer on the zirconia surface, which explains why the solely silane coupling agent was less effective than the combined 10-MDP/ silane ceramic primer for bonding to zirconia pretreated by TSC.
KW - Scanning electron microscopy
KW - Silane coupling agents
KW - Transmission electron Microscopy
KW - Tribochemical silica coating
KW - Zirconia
UR - http://www.scopus.com/inward/record.url?scp=85061404942&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061404942&partnerID=8YFLogxK
U2 - 10.4012/dmj.2017-397
DO - 10.4012/dmj.2017-397
M3 - Article
C2 - 30298858
AN - SCOPUS:85061404942
SN - 0287-4547
VL - 38
SP - 107
EP - 113
JO - Dental Materials Journal
JF - Dental Materials Journal
IS - 1
ER -