Effect of Laser Surface Texturing Using a Surface Transition Machine on Bonding Strength to Zirconia Ceramic
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The purpose of this study was to evaluate the effect of zirconia surface treatment using laser surface texturing performed with a Surface Transition Machine (STM). Zirconia specimens were fabricated in two shapes: 40 cylindrical specimens and square specimens. These were divided into two groups: the sandblasting group and the STM treatment group. Each group was bonded with either resin cement (Duo-Link) or resin-modified glass ionomer (RMGI) cement (RelyX Luting 2) after Z-Prime Plus primer application. The shear bond strength was measured using a universal testing machine, and the surface characteristics were analyzed using scanning electron microscopy and high-performance 3D digital microscopy. The group bonded with resin cement after STM treatment (48.4 ± 10.4 MPa) exhibited the highest shear bond strength, whereas the group bonded with RMGI cement after sandblasting (8.1 ± 1.5 MPa) exhibited the lowest. The STM treatment group showed significantly higher shear bond strength than the sandblasted group, and the Duo- Link group demonstrated significantly higher bond strength than the RelyX Luting 2 group. Surface observations showed that the STM treatment group exhibited rough surfaces and regularly patterned retentive structures. The surface roughness (Sa) was also significantly higher in the STM treatment group (13.3 ± 1.5 μm) than in the sandblasting group (7.08 ± 0.4 μm). In conclusion, STM treatment effectively improved the shear bond strength between zirconia and cement, particularly providing the highest bond strength when used with resin cement.
Abstract
The purpose of this study was to evaluate the effect of zirconia surface treatment using laser surface texturing performed with a Surface Transition Machine (STM). Zirconia specimens were fabricated in two shapes: 40 cylindrical specimens and square specimens. These were divided into two groups: the sandblasting group and the STM treatment group. Each group was bonded with either resin cement (Duo-Link) or resin-modified glass ionomer (RMGI) cement (RelyX Luting 2) after Z-Prime Plus primer application. The shear bond strength was measured using a universal testing machine, and the surface characteristics were analyzed using scanning electron microscopy and high-performance 3D digital microscopy. The group bonded with resin cement after STM treatment (48.4 ± 10.4 MPa) exhibited the highest shear bond strength, whereas the group bonded with RMGI cement after sandblasting (8.1 ± 1.5 MPa) exhibited the lowest. The STM treatment group showed significantly higher shear bond strength than the sandblasted group, and the Duo- Link group demonstrated significantly higher bond strength than the RelyX Luting 2 group. Surface observations showed that the STM treatment group exhibited rough surfaces and regularly patterned retentive structures. The surface roughness (Sa) was also significantly higher in the STM treatment group (13.3 ± 1.5 μm) than in the sandblasting group (7.08 ± 0.4 μm). In conclusion, STM treatment effectively improved the shear bond strength between zirconia and cement, particularly providing the highest bond strength when used with resin cement.