Does the bonding effectiveness of a fiber post/resin composite benefit from mechanical or chemical treatment? Seven methods for saliva-contaminated surfaces

Abstract

Purpose: This study examined four cleaning methods and three chemical treatments for artificial saliva-contaminated fiber posts in terms of bonding durability to resin composite core materials. Methods: Non-contaminated fiber posts (Tokuyama FR Post, Tokuyama Dental) and those contaminated (GC Fiber Post, GC) with artificial saliva (Saliveht Aerosol, Teijin Pharma) were used. Washing and drying (WD), alcohol cleaning (AlC), H3PO4 etching (P/WD), alumina blasting (B/D) for decontamination and silanization (Clearfil Ceramic Primer Plus, Kuraray Noritake Dental, Si), resin priming (HC Primer, Shofu, MMA), and bonding resin application (Clearfil Universal Bond Quick, Kuraray Noritake Dental, BR) for chemical treatment were performed. The treated fiber post was planted inside a cylindrical tube and filled with resin composite (DC Core Automix ONE, Kuraray Noritake Dental). The specimen was sectioned, and a push-out test was performed after 24 h, 1 month, and 3 months. The fracture surface was observed using a scanning electron microscope (SEM). Results: Adhesion between the non-contaminated fiber post and resin composite did not improve by silanization and decreased by alumina blasting. SEM observations revealed a fractured glass fiber by alumina blasting. Saliva contamination decreased the bond strength between the fiber post and resin composite; however, recovery was achieved by WD, Alc, P/WD, and B/D. Compared to Si, BR (P = 0.009) was effective in restraining the long-term durability of bonding, whereas MMA (P = 0.99) was not. Conclusions: The application of bonding resin after alcohol cleaning is the most convenient and effective clinical procedure for fiber post surface treatment.

Influence of using different translucent composite resins for customizing fiber post on the bond strength of self-adhesive cement to root dentin

“…Failures in the polymerization of the cement may have resulted in weaknesses within the cement structure. Factors that may have contributed to these failures include inadequate light penetration and high polymerization stresses [30][31][32][33] . Self-adhesive cements have an organic matrix with multifunctional methacrylate monomers derived from phosphoric acid that chemically interact with the hydroxyapatite present in the dental tissue, eliminating the need for dentin pre-treatment 34) .…”

Dental material research in prosthodontics—Towards developing better and efficient biomimetic materials

“…This approach enables patients to maintain healthy, natural-looking smiles for longer periods, thereby reducing the need for more invasive and expensive dental procedures. One of the most promising areas of biomimetic research in prosthodontics is the development of materials that can bond to the natural tooth structure [3,4]. This would reduce the need for traditional mechanical retention methods, such as cementation or screws, which can weaken the tooth and increase the risk of failure.…”