Bonding Effectiveness of Veneering Ceramic to Zirconia After Different Grit-Blasting Treatments

Overview

Journal Dent J (Basel)

Specialty Dentistry

Date 2024 Jul 26

PMID 39057005

Authors

Francesca Zicari

Carlo Monaco

Marcio Vivan Cardoso

Davide Silvestri

Bart Van Meerbeek

Affiliations

Soon will be listed here.

Abstract

To determine the effect of grit-blasting before and after sintering on the surface roughness of zirconia and the micro-tensile bond strength of a pressable veneering ceramic to zirconia. Pre-sintered zirconia blocks (IPS e.max ZirCAD, Ivoclar) were divided into four test groups of three specimens each and a control group ('CTR'; no surface treatment). Pre-S-30, Pre-S-50, and Pre-S-110 were grit-blasted with 30-µm SiO-coated AlO, 50-µm AlO and 110-µm AlO particles, respectively, before sintering. Post-S-30 was grit-blasted with 30-µm SiO-coated AlO after sintering. For each treatment, the surface roughness was measured (Ra, Perthometer M4P, Mahr Perthen). After sintering the zirconia blocks, a liner was applied and a pressable ceramic (IPS e.max ZirPress, Ivoclar) was heat-pressed. Sixteen microbars were obtained from each block and submitted to micro-tensile bond-strength (µTBS) testing. Data were analyzed with one-way ANOVA. Any correlation between Ra and µTBS was evaluated (Sperman test). Grit-blasting before sintering with 110-µm AlO (Ra = 3.4 ± 0.4 µm), 50-µm AlO (Ra = 2.3 ± 0.5 µm), and 30-µm SiO-coated AlO (Ra = 1.2 ± 0.2 µm) resulted in significantly higher roughness than grit-blasting after sintering with 30-µm SiO-coated AlO (Ra = 0.5 ± 0.1 µm). The highest µTBS was measured when the sintered zirconia was grit-blasted with 30-μm SiO-coated AlO (µTBS = 28.5 ± 12.6 MPa), which was significantly different from that of specimens that were grit-blasted before sintering (µTBS = 21.8 ± 10.4; µTBS = 24.1 ± 12.6; µTBS = 26.4 ± 14.1) or were not grit-blasted (µTBS = 20.2 ± 11.2). Grit-blasting zirconia before sintering enhanced the surface roughness proportionally to the particle size of the sand used. Grit-blasting with 30-µm SiO-coated AlO after sintering improved bonding of the veneering ceramic to zirconia. : As grit-blasting with 30-µm SiO-coated AlO after sintering improved bonding of the veneering ceramic to zirconia, it may reduce veneering ceramic fractures/chipping.

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