Effectiveness and stability of silane coupling agent incorporated in ‘universal’ adhesives

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• 作者：Kumiko Yoshiharaup>aup>up> ; up>up>k-yoshi@md.okayama-u.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Noriyuki Nagaokaup>bup>up> ; up>up>nagaoka@okayama-u.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Akinari Sonodaup>cup>up> ; up>up>a.sonoda@aist.go.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Yukinori Maruoup>dup>up> ; up>up>ykmar@md.okayama-u.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Yoji Makitaup>cup>up> ; up>up>y-makita@aist.go.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Takumi Okiharaup>eup>up> ; up>up>okihara@cc.okayama-u.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Masao Irieup>fup>up> ; up>up>mirie@md.okayama-u.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Yasuhiro Yoshidaup>gup>up> ; up>up>yasuhiro@den.hokudai.ac.jp" class="auth_mail" title="E-mail the corresponding authorup> ; Bart Van Meerbeekup>hup>up> ; up>up>bart.vanmeerbeek@med.kuleuven.be" class="auth_mail" title="E-mail the corresponding authorup>
• 关键词：Silane ; Coupling agent ; Universal adhesive ; NMR ; FTIR ; Bond strength
• 刊名：Dental Materials
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：32
• 期：10
• 页码：1218-1225
• 全文大小：1651 K

文摘

For bonding indirect restorations, some ‘universal’ adhesives incorporate a silane coupling agent to chemically bond to glass-rich ceramics so that a separate ceramic primer is claimed to be no longer needed. With this work, we investigated the effectiveness/stability of the silane coupling function of the silanecontaining experimentally prepared adhesives and Scotchbond Universal (3MESPE).

Methods and materials

Experimental adhesives consisted of Scotchbond Universal and the silane-free Clearfil S3 ND Quick (Kuraray Noritake) mixed with Clearfil Porcelain Bond Activator (Kuraray Noritake) and the two adhesives to which γ-methacryloxypropyltrimethoxysilane (γ-MPTS) was added. Shear bond strength was measured onto silica-glass plates; the adhesive formulations were analyzed using fourier transform infrared spectroscopy (FTIR) and 13C nuclear magnetic resonance (NMR). In addition, shear bond strength onto CAD-CAM composite blocks was measured without and after thermo-cycling ageing.

Results

A significantly higher bond strength was recorded when Clearfil Porcelain Bond Activator was freshly mixed with the adhesive. Likewise, the experimental adhesives, to which γ-MPTS was added, revealed a significantly higher bond strength, but only when the adhesive was applied immediately after mixing; delayed application resulted in a significantly lower bond strength. FTIR and up>13up>C NMR revealed hydrolysis and dehydration condensation to progress with the time after γ-MPTS was mixed with the two adhesives. After thermo-cycling, the bond strength onto CAD-CAM composite blocks remained stable only for the two adhesives with which Clearfil Porcelain Bond Activator was mixed.

Significance

Only the silane coupling effect of freshly prepared silanecontaining adhesives was effective. Clinically, the use of a separate silane primer or silane freshly mixed with the adhesive remains recommended to bond glass-rich ceramics.