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Title: 0584 - Bond Durability of a Novel Fluoro-carbon Functional Monomer With Zirconia

Authors:

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)

Abstract:

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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Disclosure Statement:
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

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