Abstract
Improving the strength of the bonding of zirconia to composite resins remains a challenge in dental restorations. The purpose of this study was to evaluate the shear strength of the bonding of zirconia to composite resins, thereby verifying the hypothesis that as the power of the non-thermal oxygen plasma increases, the bonding strength of the plasma-treated zirconia is increased. The effects of the oxygen plasma power (100, 200, and 400 W) on the surface structure, chemical composition, and hydrophilicity of the zirconia and the strength of the bonding between zirconia and composite resin were investigated. As a result, after different plasma power treatments, the surface structure and phase composition of zirconia were not different from those of zirconia without treatment. However, the oxygen plasma treatment not only reduced carbon adsorption but also greatly increased the hydrophilicity of the zirconia surface. More importantly, the strength of the bonding between the plasma-treated zirconia and composite resin was significantly higher than that in the corresponding control group without plasma treatment. Regardless of whether the zirconia was pristine or sandblasted, the higher the plasma power, the greater the bond strength obtained. The conclusion is that the oxygen plasma treatment of zirconia can effectively improve the strength of the bonding between the zirconia and composite resin without damaging the microstructure and phase composition of the zirconia.
Highlights
General, dental restoration materials can be divided into metal, ceramic, and polymer resin materials
By using computer-aided design/computer-aided manufacturing (CAD/CAM), the zirconia ceramic bulk can be shaped into dental cores, crowns, bridges, and frameworks for the bridges [5,6]
As expected, all the SB groups had a rough and irregular appearance that was not affected by the plasma power
Summary
Dental restoration materials can be divided into metal, ceramic, and polymer resin materials. Considering the complexity of the oral environment, the restoration materials should exhibit good biocompatibility, extraordinary mechanical strength, high durability, and good aesthetics [1]. The inherent brittleness of ceramics remains a major problem, which can increase the occurrence of unexpected fractures of dental restorations. Zirconia ceramics have outstanding bending strength and fracture toughness. Composite resins are capable of being used for constructing dental restorations and offer distinguished properties and successful colour matching for adjacent teeth, with a facile preparation procedure.
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