Effect of Dentin Surface Treatment Using a Non-Thermal Argon Plasma Brush on the Bond Strength of a Self-Adhesive Resin Composite

Abstract

Background and Aim: Improving the bond strength at the resin-dentin interface is an important challenge in adhesive dentistry. This study examined the effect of low-power, non-thermal atmospheric pressure plasma (NT-APP) treatments on the adhesion of a self-adhesive resin composite to dentin. Materials and Methods: In this experimental in-vitro study, buccal enamel of extracted bovine incisors was removed using a high-speed diamond bur. The specimens were randomly divided into two groups according to the plasma treatment and thermocycling. The non-thermal atmospheric argon plasma brush was used in this study. One subgroup was subjected to the microshear bond strength (µSBS) test after 24 hours, whereas the other subgroup was subjected to artificial aging with thermocycling for 5000 cycles before being tested. Each specimen was attached to a testing jig and loaded at a crosshead speed of 1.0 mm/minute in a universal testing machine until failure occurred. Data were analyzed using two-factor repeated measures analysis of variance (ANOVA). Results: The results of μSBS testing showed that with plasma treatment, the average μSBS increased to 34.20±12.12 MPa compared to 19.47±7.4 MPa in the controls (P=0.002). After 5000 cycles of thermocycling, the adhesive-dentin bonding strengths of the plasma-treated specimens slightly decreased from 34.20±12.12 MPa to 33.64±5.6 MPa (P=0.886), while the strengths of the untreated specimens reduced from 19.47±7.4 MPa to 19.10±5.1 MPa (P=0.461). Plasma treatment improved the µSBS compared to the control group. After thermocycling, the µSBS did not decrease in the plasma and control (non-plasma) groups. Conclusion: Plasma treatment using NT-APP improves the adhesion of self-adhesive flowable resin composites to dentin.

Applications of Non-thermal Atmospheric Plasma in Restorative Dentistry: A Narrative Review

“…It seems that such chemical interactions between the old and new composite surfaces, may explain the adequate bond strength between them (34) . Moradi, Aida, et al 2019, assessed whether NTP application by itself has the potential to increase the bond strength of self-adhesive composites without using adhesives or dentin etching before the application of the composite resin (35) . Similarly, Huang, Chun, et al, 2007, found the treatment of dentin surfaces with NTP is a promising approach to improve the penetration of adhesive and resin bond strength to dentin (36) .…”

Effects of Nonthermal Atmospheric Pressure Plasma Jet on Human Dental Pulp Stem Cells

“…10 CAP is suitable to improve the adhesion of self-adhesive flowable resin composites to dentin. 11 The effects of nonthermal atmospheric pressure plasmas (NAPPs) on human mesenchymal stem cells isolated from periodontal ligaments (hPDL-MSCs) were analyzed. 12 The findings confirm that plasma applications do not have cytotoxic or any other negative effects.…”