Comparison of sandblasted, ground and melt-etched zirconia crowns regarding adhesion strength to resin cement

Abstract

Objectives: The aim is to compare the adhesion between zirconia and cements attained with melt-etching with potassium hydrogen difluoride, KHF 2 , with that found when such traditional surface treatments as sandblasting and ceramic stone grinding are employed. Materials and methods: Groups of zirconia crowns where treated by sandblasting (n ¼ 6), grinding with carbide bur (n ¼ 6) or melt-etching with KHF 2 (n ¼ 6) of the surface before cementation with a resin cement to an implant substitute made by Selective Laser Melting of a cobaltchromium alloy. Tensile testing was performed to rupture, while measured increasing load at the zirconia-cement interface. The strength was calculated by dividing the rupture load with the contact area. The three groups were compared using one-way ANOVA. Results: The adhesion strength between the zirconia crowns and the cement resulted in significant differences between all groups (p < .05). The sandblasted group had the lowest strength (5.2 ± 0.95 MPa), the ground group significantly higher (7.3 ± 1.49 MPa) and the melt-etched group the highest values (9.8 ± 1.37 MPa). Conclusion: The adhesive strength of resin cement to zirconia can be ranked according to the surface preparation with surfaces melt-etched with KHF 2 stronger than ground which is stronger than sandblasted.

A novel approach for detecting undercuts within surface textures generated by Electrochemical Jet Machining (ECJM)

“…Another example of the usefulness of UCs is the fabrication of layered composites comprising materials of different chemical compositions such as metals and polymers [10], requiring an adequate level of adhesion through friction or adhesives. The generation of a surface topography with high density of holes and inlets has been found to be a useful way of increasing the macroscopic adhesion force between materials, allowing the fabrication of more efficient and durable composite materials [11,12], as well as aluminium alloy bonded joints [13]. Nevertheless, UCs are not always a desirable surface feature.…”

Effect of different surface treatments of presintered or sintered zirconia on bond strength to dentine

“…[ 9 10 ] Although some studies suggested reliable resin bonding to zirconia is clinically achievable,[ 11 ] other researchers have controversially questioned a reliable bond between oxide ceramics, in particular zirconia, and a bonding component. [ 12 13 14 ]…”