Experimental Resin-Based Monoblock Endodontic Obturation System

Abstract

Objective The aim of the present study was to characterize a novel resin-based monoblock endodontic obturation system consisting of a polymeric cone and a resin-based endodontic sealer. Methods The preliminary tests performed for the experimental cone were as follows: cohesive strength, dimensional stability, standardization of the diameter and taper, calcium ion release, and radiopacity, for the characterization of the experimental sealer, film thickness and flow tests were performed. Tests were performed according to the American National Standards Institute/American Dental Association (ANSI/ADA) Standards Nos. 57 and 78. The experimental cone was compared to gutta-percha, whereas the experimental sealer was compared to AH Plus. Data were analyzed by Student's t-test (α = 0.05). Results The experimental cone had superior values for cohesive strength and dimensional stability compared to gutta-percha. Regarding calcium ion release, the experimental system continued to release calcium ions after 30 days. Film thickness was similar for both endodontic sealers; conversely, the experimental resin-based sealer achieved higher values for flow compared to AH Plus. Conclusion The experimental resin-based monoblock obturation system fully met the requirements of the ANSI/ADA Standard No. 78 and the ANSI/ADA Standard No. 57, except for radiopacity. Considering this, further studies are still needed to evaluate other radiopacifiers and the effect of their incorporation on the physicochemical properties of this novel resin-based monoblock endodontic obturation system.

Monoblock Concept in Endodontics: A Review

“…Also, many studies evaluated and compared the performance of obturation techniques; however, they have founded that no filling material or technique has fulfill ideal requirements. 6 These researches for an ideal root canal filling material has given rise to the concept of endodontic monoblocks. 2 Monoblock obturation concept obtained using single-cone technique associated with sealer, providing adhesion between the sealer and the dentinal tubules and also, between the sealer and the obturating cones.…”

“…2 Monoblock obturation concept obtained using single-cone technique associated with sealer, providing adhesion between the sealer and the dentinal tubules and also, between the sealer and the obturating cones. 6 However, the main purpose of adhesive root canal filling materials is the formation of fluid tight seal via creation of monoblock which provides strengthening to endodontically treated tooth. 7 Some laboratory studies have shown that creation of monoblock root filling is a real challenge because of the heterogeneous composition of root dentin and it complex anatomy like fins, extensions and isthmuses; presence of sclerotic dentin in the apical third; and accumulation of large amount of hard tissue debris within the canal space.…”