Do Chemical-Based Bonding Techniques Affect the Bond Strength Stability to Cubic Zirconia?

Allegra Comba,Rossella Femiano,Letizia Perrone,Carlo Massimo Saratti,Andrea Baldi,Felice Femiano,Massimo Carossa,Riccardo Michelotto Tempesta,Nicola Scotti,Giovanni Tommaso Rocca

doi:10.3390/ma14143920

Allegra Comba, Rossella Femiano + Show 8 more

Open Access

https://doi.org/10.3390/ma14143920

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Abstract

This study evaluated the effectiveness of chemical-based adhesive techniques on promoting immediate and aged bond strength between zirconia and luting cement. A total of 128 discs of zirconia were divided into 4 groups (n = 32) according to the adhesive treatment: tribochemical silica-coating followed by silane (Silane Primer, Kerr) and bonding (Optibond FL, Kerr), Signum Zirconia Bond (Hereaus), Z-Prime Plus (Bisco), and All-Bond Universal (Bisco). Composite cylinders were cemented on the zirconia sample with Duo-Link Universal (Bisco). Eight specimens per group were subjected to 10,000 thermocycles and subsequently bond strength was tested with shear-bond strength test. ANOVA test showed that artificial aging significantly affected the bond strength to zirconia. Bonferroni test highlighted a significant influence of adhesive treatment (Signum) on bond strength after thermocycling. It was concluded that 10-MDP-based bonding systems showed no improvement in initial bond strength compared with tribochemical treatment. All chemical bonding techniques tested in this study were influenced by thermocycling.

Highlights

Continued development of dental ceramics has allowed the coupling of excellent esthetic qualities with improved mechanical properties, and these ceramics are widely used to realize indirect metal-free restorations
This study was designed in 8 study groups (n = each), where the specimens were randomly allocated considering: “Adhesive Protocol” in 4 levels: four different adhesive protocols for cubic zirconia bonding, were selected (32 specimens each): tribochemical treatment, significant influence of adhesive treatment (Signum) Zirconia Bond (Kulzer, Hanau, Germany); Z-Prime Plus (Bisco, Schaumburg, IL, USA); All-Bond Universal (Bisco, Schaumburg, IL USA)
The shear-bond strength test is a relatively simple and quick method, and it has been used in several studies to evaluate the bond strength on ceramic materials [24,32]

Summary

Introduction

Continued development of dental ceramics has allowed the coupling of excellent esthetic qualities with improved mechanical properties, and these ceramics are widely used to realize indirect metal-free restorations. Their major properties are hardness, a high coefficient of elasticity, resistance to heat and chemical attack, and high fragility [1,2,3]. Ceramics are brittle and stiff materials, showing elastic modulus between 65 GPa (feldspathic and glass ceramics) and 250 GPa (alumina- and zirconia-based ceramics) [5]. With advances in CAD/CAM technology, it has become possible to realize restorations with improved strength, marginal fit, and esthetics with materials that could not otherwise be managed [8]

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