Effect of 2% chlorhexidine application on microtensile bond strength of resin composite to dentin using one-step self-etch adhesives

Abstract

Objectives: This study examined the effect of 2% chlorhexidine on the μ TBS of a direct composite restoration using one-step self-etch adhesives on human dentin. Materials and Methods: Twenty-four extracted permanent molars were used. The teeth were assigned randomly to six groups (n = 10), according to the adhesive system and application of chlorhexidine. With or without the application of chlorhexidine, each adhesive system was applied to the dentin surface. After the bonding procedure, light-cure composite resin buildups were produced. The restored teeth were stored in distilled water at room temperature for 24 hours, and then cut and glued to the jig of the microtensile testing machine. A tensile load was applied until the specimen failed. The failure mode was examined using an operating microscope. The data was analyzed statistically using one-way ANOVA, Student' s t-test (p < 0.05) and Scheffe ′ ' s test. Results: Regardless of the application of chlorhexidine, the Clearfil S 3 Bond showed the highest μ TBS, followed by G-Bond and Xeno V. Adhesive failure was the main failure mode of the dentin bonding agents tested with some samples showing cohesive failure. Conclusions:The application of 2% chlorhexidine did not affect the μ TBS of the resin composite to the dentin using a one-step self-etch adhesive.

Pengaruh Chlorhexidine 2% Sebagai Cavity Cleanser Terhadap Kuat Geser Resin Komposit Bioaktif

“…Ion positif dari chlorhexidine dapat meningkatkan gugus fosfat pada permukaan gigi. 12,13 Kekuatan geser juga dapat dipengaruhi oleh beberapa faktor antara lain bentuk subjek penelitian, tekstur permukaan, komposisi, dan preparasi subjek penelitian, serta prosedur pengukuran menggunakan alat uji. 11 Hasil Penelitian ini sesuai dengan penelitian Boruziniat et al yang menyatakan bahwa chlorhexidinee gluconate 2% dapat mengganggu prosedur bonding dan mengurangi kuat rekat pada sistem adesif, karena chlorhexidine gluconate 2% mengikat gugus fosfat dari kristal apatit di dalam smear layer atau di permukaan dentin yang dapat menganggu infiltrasi dari resin.…”