ASSESSMENT OF SURFACE TREATMENT WITH ATMOSPHERIC COLD PLASMA ON THE BOND STRENGTH OF FIBER POST
Project no. 409 · Status: Kapanmış · 2017
Summary
The most common cause of failure in the glass fiber posts (GFPs), which have been frequently used in cases with excessive loss of coronal dental tissue, is loss of retention. The bonding failure between resin cement and fiber post is one of the possible reasons of this. To improve the adhesion, various surface treatments on GFPs have been performed. There are some studies showing that Cold atmospheric plasma (CAP) provides several types of surface treatments on dental structures or materials for adhesion improvement. The purpose of this study was to evaluate the effect of surface treatment with CAP on the bond strength (BS) of GFPs comparing with conventional treatments. Sixty extracted anterior teeth were selected. After complete endodontic treatment, all roots were randomly divided into four groups (n=15) according to the type of treatment performed to the post surface: plasma, silane, hydrofluoric acid and control groups. GFPs were cemented using self-adhesive resin cement. Surface treatments with plasma were performed using non- thermal atmospheric pressure dielectric barrier discharge air plasma. The roots were sectioned transversally into 1-mm thick slices and the samples were obtained from three different regions of the root. For measuring BS, the push-out test was performed to all samples. Treated post surfaces were examined by SEM and their contact angles were measured. Push-out test results showed that the highest BS values were obtained in the plasma group with a statistically significance. The contact angle measurements showed that the most hydrophilic surface was observed in the plasma group. SEM analysis revealed that significant increase in the roughness was observed on the surface treated by plasma. In conclusion, the surface treatment with plasma application significantly enhances the interfacial BS between GFPs and resin cements. It is also evident that the CAP is a more effective method compared to other conventional surface treatments.