Effect of bioglass and silica coating of zirconia substrate on its bond strength to resin cement

Abstract

This study aimed to assess the effect of bioglass and silica coating of zirconia substrate on its bond strength to resin cement. A total of 120 specimens were used in this in-vitro, experimental study. Zirconia discs measuring 10×7×2 mm were cut from Y-TZP zirconia blocks, sintered, cleaned and received different surface treatments of sandblasting, bioglass powder coating+etching, bioglass powder coating+etching+silanization, bioglass slurry coating+etching, bioglass slurry coating+etching+silanization, silica coating+silanization, silica coating+etching+silanization and no treatment group (control). Then the microshear bond strength testing and scanning electron microscope (SEM) analysis were done. Data were analyzed using the Mann Whitney U and the Kruskal Wallis tests. Significant differences existed in bond strength of different groups (p<0.001). The sandblasted and bioglass coated groups showed higher and the colloidal silica-coated groups showed lower bond strength compared to the control group.

The effect of subpressure on the bond strength of resin to zirconia ceramic

“…Although many dental techniques [32] have been extensively investigated to improve the bond strength of resin to zirconia ceramics, there is no established protocol that can produce a stable bond which can be easily used at the present time. To achieve higher retention, prevent micro-leakage, and increase the fracture and fatigue resistance of restorations, many studies are under way [13, 26, 27]. However, the subpressure infiltration technique has not been applied in the dental adhesion.…”

“…Many surface treatments have been used to improve the bond strength of resin to zirconia ceramics over the past two decades, including air abrasion [11], diamond burs abrasion [12], silica (tribochemical) coating [13], silicoating [14, 15],selective infiltration etching [16] and laser [17, 18]. However, many studies have found microscopic cracks because these surface treatments can accelerate tetragonal-to-monoclinic (t→m) phase transformation [19–22], and other researchers found that airborne particle abrasion decreased micro tensile bond strength [23].…”

Mechanical characteristic and biological behaviour of implanted and restorative bioglasses used in medicine and dentistry: A systematic review

“…Polymers can be used as a reinforcing agents, as in the study of Montazeri et al [41] which covers a nBG (nano-bioglass) scaffold with poly-3-hydroxybutyrate (P3HB), increasing the compressive strength and compressive modulus which is directly proportional to the immersion time in the polymer. Recently, Moezzizadeh et al [5] found that using bioglass as coating on zirconia implants enhance the bond strength to resin cement. This increase could be attributed to the higher surface roughness in the etched bioglass-coated surface.…”

“…Micro and nano-particles have superior bioactive behaviours due to a larger specific surface area that allows a faster ion release. Bioactive coatings are likewise very important for metallic implants because they have the potential to improve their performance by providing strong bonding to the host bone and to the resin cement [5]. Nevertheless, 45S5 bioglasses are applied also to non-permanent materials especially used in dentistry.…”

“…Silicon has a charge of 4+. • Phosphate-based glasses in the system CaO-Na 2 O-P 2 O 5 have the tetrahedral structure formed by PO 4 units and the phosphate group has a charge of 5 + [16]. Therefore, they contain at least one terminal oxygen that limits connectivity and so the reactivity of the structure that gives unique dissolution properties in aqueous-based fluids for these types of glasses.…”