Evaluation of Tensile Retention of Y-TZP Crowns Cemented on Resin Composite Cores: Effect of the Cement and Y-TZP Surface Conditioning

Abstract

This study evaluated the effect of the cement type (adhesive resin, self-adhesive, glass ionomer, and zinc phosphate) on the retention of crowns made of yttria-stabilized polycrystalline tetragonal zirconia (Y-TZP). Therefore, 108 freshly extracted molars were embedded in acrylic resin, perpendicular to their long axis, and prepared for full crowns: the crown preparations were removed and reconstructed using composite resin plus fiber posts with dimensions identical to the prepared dentin. The preparations were impressed using addition silicone, and Y-TZP copings were produced, which presented a special setup for the tensile testing. Cementation was performed with two adhesive resin cements (Multilink Automix, Ivoclar-Vivadent; RelyX ARC, 3M ESPE, St Paul, MN, USA), one self-adhesive resin cement (RelyX U100, 3M ESPE), one glass ionomer based cement (RelyX Luting, 3M ESPE), and one zinc phosphate cement (Cimento de Zinco, SS White, Rio de Janeiro, Brazil). For the resin cement groups, the inner surfaces of the crowns were subjected to three surface treatments: cleaning with isopropyl alcohol, tribochemical silica coating, or application of a thin low-fusing glass porcelain layer plus silanization. After 24 hours, all groups were subjected to thermocycling (6000 cycles) and included in a special device for tensile testing in a universal testing machine to test the retention of the infrastructure. After testing, the failure modes of all samples were analyzed under a stereomicroscope. The Kruskal-Wallis test showed that the surface treatment and cement type (α=0.05) affected the tensile retention results. The Multilink cement presented the highest tensile retention values, but that result was not statistically different from RelyX ARC. The surface treatment was statistically relevant only for the Multilink cement. The cement choice was shown to be more important than the crown surface treatment for cementation of a Y-TZP crown to a composite resin substrate.

Shear Bond Strength of Al2O3 Sandblasted Y-TZP Ceramic to the Orthodontic Metal Bracket

“…However, band is unaesthetic in the anterior, which requires esthetic compared with the posterior, and may irritate the gingiva. Thus, there is a great interest in developing methods for maintaining bonded brackets directly on restoratives, and appropriate surface treatment methods have been devised [17,18,19]. …”

“…As surface treatment methods become more complicated, the clinical application of these methods become more difficult, which means that finding a simple method to enhance the bond strength becomes imperative. To increase the bond strength, a variety of surface treatments [17,18,19] such as rough polishing, sandblasting with high strength particles, glass coating, acid etching, laser treatment, and primer treatments have been reported [14,20,21,22,23]. …”

Dental implant surfaces treated with phosphoric acid can modulate cytokine production by blood MN cells

“…Different pretreatments (chemical, mechanical or both) for implant surfaces in contact with the cement line have been proposed in other studies. 15,16,17 Studies on the strength of cemented crowns with different roughness after treatment with aluminum oxide revealed that smooth surfaces show less tensile strength than those with grooves or roughness and that the topography of the prosthetic abutment can increase resistance. 18 In the present study, exposure to phosphoric acid increased the opacity and porosity of the metal surface.…”

Grinding of composite cores using diamond burs with different grit sizes

“…Representative images were taken with a scanning electronic microscope (SEM) (JSM-6360LV, JEOL USA, Inc., Peabody, MA, USA). This classification was adapted from Amaral et al 4 and Rippe et al 6 .…”

“…During the clinical treatment with prosthetics, dentists will often use provisional restorations in patients before permanent restoration can be performed. During this period, the composite core build-up can be exposed to moisture, variances in pH and temperature 6 and temporary luting cements 7 . As a result, surface alterations of the composite core could be required to improve their adhesion to resin cements and for optimal crown retention 6 .…”