کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5432974 | 1398050 | 2017 | 11 صفحه PDF | دانلود رایگان |
- Time-of-flight secondary ion mass spectrometry functions in analyzing organic coating.
- The covalent bond between MDP and zirconia is verified by zirconium phosphate-related ions.
- A sequential application of MDP and MPS primers does not improve zirconia-resin bonding.
ObjectiveTo evaluate the 3-methacryloyloxypropyltrimethoxysilane (MPS)- and 10-methacryloyloxydecyl-dihydrogen-phosphate (MDP)-base primers, in their single or sequential applications, with regard to modifying zirconia surfaces and improving resin-zirconia adhesion.MethodsZirconia disks received different treatments: without primer (Zr), MPS-base primer (S), MDP-base primer (M), MPS/MDP mixture (SMmix), MPS followed by MDP (SM), and MDP followed by MPS (MS). The compositions and chemical interactions of the coatings to zirconia were analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) and reconstructed 3D ion images. Surface wettability of these coatings to water and resin adhesive was assessed. The shear bond strength (SBS) between resin and the treated zirconia was also examined before and after thermocycling.ResultsGroups S and MS presented substantial OHâ ions in the coatings and zirconia substrate. PO2â and PO3â fragments existed in all MDP-treatment groups with various proportions and distributions, while groups M and SM showed higher proportions of PO3â and the zirconium phosphate related ions. In 3D ion images, PO3â in groups M and SM was denser and segregated to the interface, but was dispersed or overlaid above PO2â in SMmix and MS. All the primers increased the surface wettability to water and resin, with M and SM presenting superhydrophilic surfaces. All MDP-treatment groups showed improved SBS before thermocycling, while M and SM retained higher SBS after this.SignificanceThe MDP-base primer shows a relevant function in facilitating POZr bonding and enhancing resin-zirconia bonding. The co-treated MPS impairs the chemical activity of MDP, especially if it is the final coat.
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Journal: Dental Materials - Volume 33, Issue 8, August 2017, Pages 923-933