Title: 0584 - Bond Durability of a Novel Fluoro-carbon Functional Monomer With Zirconia
Kumiko Yoshihara, Okayama University
Satoshi Hayakawa, Okayama University
Noriyuki Nagaoka, Okayama University
Yasuhiro Yoshida, Hokkaido University
Bart Van Meerbeek (Presenter)
KU Leuven (University of Leuven)
Objectives: The functional monomer 10-methacryloxydecyl dihydrogen phosphate (10-MDP) ionically bonds to zirconia. However, more hydrolysis-resistant functional monomers are needed to improve bond durability. Our previous study revealed a favorable bonding potential of the fluoro-carbon monomer 8-methacryloylox-2,2,3,3,4,4,5,5,6,6,7,7-dodecafluorooctyl dihydrogen phosphate (MF12P; Kuraray Noritake: KN) to dentin and hydroxyapatite. Here, we aimed to unravel the adhesive mechanism of MF12P to zirconia using NMR and static contact-angle measurement using a water droplet, as well as to determine its bonding potential to zirconia using a shear bond strength (SBS) approach.
Methods: Zirconia particles were added to 10wt% MF12P in ethanol for 30 min, followed by washing with ethanol and air-drying. The MF12P-reacted powder was analyzed using solid-state NMR. The static contact angle of water on zirconia treated with 1wt% MF12P in ethanol for 10 s was measured. In order to measure SBS, 1wt% MF12P ethanol solution was applied for 10 s on 15-μm polished zirconia plates. After air-drying, sandblasted zirconia cylinders treated with Clearfil Ceramic Primer Plus (KN; contains 10-MDP) were luted onto the MF12P-treated zirconia plates using functional monomer-free composite cement Panavia V5 (KN). SBS was measured after 24h (‘immediate’) and 150K thermocycles (‘aged’). 10-MDP (KN) and 6-methacryloxy-2,2,3,3,4,4,5,5-octafluorohexyl dihydrogen phosphate (MF8P; KN) served as references.
Results: NMR confirmed adsorption of all monomers onto zirconia. The contact angle of water on MF12P-treated zirconia was significantly higher than that on untreated zirconia and zirconia treated with 10-MDP or MF8P. The ‘immediate’ SBS of MF12P was significantly higher than that of 10-MDP and MF8P; SBS reduced upon aging for all three monomers, but significantly less for MF12P.
Conclusions: MF12P readily adsorbed onto zirconia and resulted in a higher immediate and more aging-resistant bonding effectiveness, confirming that MF12P is a promising functional monomer for durable bonding to zirconia.
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The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: None