MDP Salts: A New Bonding Strategy for Zirconia.

Area of Science:

• Biomaterials Science
• Dental Materials Science
• Surface Chemistry

Background:

• Achieving durable resin-ceramic adhesion is critical for the clinical longevity of dental restorations.
• Zirconia ceramics present unique challenges for bonding due to their inert surface properties.

Purpose of the Study:

• To evaluate the effect of 10-methacryloxydecyl dihydrogen phosphate (MDP), MDP+silane, and MDP-salt primers on the bond strength and chemical interaction with alumina-blasted zirconia.
• To compare the priming efficacy of MDP-salt against conventional MDP and MDP+silane treatments.

Main Methods:

• Tensile bond strength testing was performed before and after thermocycling.
• Surface analysis included X-ray photoelectron spectroscopy (XPS) for elemental composition, contact angle measurements, scanning electron microscopy (SEM) for surface morphology, and 3D confocal laser scanning microscopy for surface topography.

Main Results:

• MDP-salt demonstrated significantly higher tensile bond strength compared to MDP and MDP+silane, both before and after thermocycling (P < 0.05).
• Contact angle measurements revealed significant differences (P < 0.001) with MDP-salt showing the highest values, indicating altered surface wettability.
• XPS analysis confirmed the presence of phosphorus peaks on MDP-salt treated zirconia, suggesting chemical interaction and priming properties.

Conclusions:

• MDP-salt exhibits superior zirconia priming capabilities, leading to enhanced resin cement bonding performance.
• The improved bond strength and chemical interaction mediated by MDP-salt are beneficial for durable resin-ceramic adhesion in dental applications.