The Impact of Plasma Treatment of Cercon® Zirconia Ceramics on Adhesion to Resin Composite Cements and Surface Properties

Abstract

Introduction:In recent years, the use of ceramic base zirconia is considered in dentistry for all ceramic restorations because of its chemical stability, biocompatibility, and good compressive as well as flexural strength. However, due to its chemical stability, there is a challenge with dental bonding. Several studies have been done to improve zirconia bonding but they are not reliable. The purpose of this research is to study the effect of plasma treatment on bonding strength of zirconia. Methods: In this in vitro study, 180 zirconia discs' (thickness was 0.85-0.9 mm) surfaces were processed with plasma of oxygen, argon, air and oxygen-argon combination with 90-10 and 80-20 ratio (n=30 for each group) after being polished by sandblast. Surface modifications were assessed by measuring the contact angle, surface roughness, and topographical evaluations. Cylindrical Panavia f2 resin-cement and Diafill were used for microshear strength bond measurements. The data analysis was performed by SPSS 20.0 software and one-way analysis of variance (ANOVA) and Tukey test as the post hoc. Results: Plasma treatment in all groups significantly reduces contact angle compare with control (P = 0.001). Topographic evaluations revealed coarseness promotion occurred in all plasma treated groups which was significant when compared to control (P < 0.05), except argon plasma treated group that significantly decreased surface roughness (P < 0.05). In all treated groups, microshear bond strength increased, except oxygen treated plasma group which decreased this strength. Air and argon-oxygen combination (both groups) significantly increased microshear bond strength (P < 0.05). Conclusion: According to this research, plasmatic processing with dielectric barrier method in atmospheric pressure can increase zirconia bonding strength.

Effect Of Non-Thermal Air Plasma Treatment On Shear Bond Strength Of Adhesive Resin Cement To Zirconia

“…These were in accordance with many researches (5,27,28) . Valverde et al (29) found a significant increase in the bond strength to zirconia surfaces when cold plasma was applied alone or in combination with alumina sandblasting.…”

“…Surface energy (SE) is a term describing the intermolecular forces of the material surface, depending on polar and disperse constituents of the surface (30) . There is an opposite correlation between the SE of a surface and contact angle measurements of liquids (5) .…”

“…Valverde et al (29) found a significant increase in the bond strength to zirconia surfaces when cold plasma was applied alone or in combination with alumina sandblasting. Also, Tabari et al (5) mentioned that air plasma treatment increased the micro-shear bond strength. Ito et al (24) referred these to increase SE (surface energy) after atmospheric plasma treatment.…”

“…It has been suggested to apply cold atmospheric plasma as a promising technique in dental field for adhesive bonding improvement with zirconia restorations (5) .…”

Silicon‐based film on the yttria‐stabilized tetragonal zirconia polycrystal: Surface and shear bond strength analysis

“…In this study, aimed at achieving better adhesion between Y‐TZP and resin cement, we chose to perform tests using Cercon Zirconia, which has previously been used to test strategies in the improvement of bond strength . According to our results, the PECVD technique and the Si‐based film deposited on the specimens promoted higher roughness on the surfaces tested compared with the polished group.…”