Ultrastructural Evaluation of the Apical Seal in Roots Filled with a Polycaprolactone-Based Root Canal Filling Material

Abstract

This in vitro study compared the ultrastructural quality of the apical seal achieved with Resilon/Epiphany and gutta-percha/AH Plus. Single-rooted extracted human teeth were prepared using a crown-down technique, debrided with NaOCl and EDTA, and obturated with either Resilon/Epiphany or gutta-percha/AH Plus. They were examined for gaps along canal walls using SEM, and for apical leakage using a transmission electron microscopy (TEM). SEM revealed both gap-free regions, and gap-containing regions in canals filled with both materials. TEM revealed the presence of silver deposits along the sealer-hybrid layer interface in Resilon/Epiphany, and between the sealer and gutta-percha in the controls. It is concluded that a complete hermetic apical seal cannot be achieved with either root filling materials.

Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

“…Epiphany has presented lower bond strength, even with the use of EDTA, which could play an important role with this sealer because of its self-etching characteristic and the hybrid layer formation that occurs in this kind of sealer. The removal of the smear layer created during instrumentation could lead to greater sealer penetration into the exposed tubules, which may increase adhesion 16) . The Epiphany composition is based on methacrylates (i.e., Ethoxylated bisphenol A dimethacrylate -BisEMA) and presents a dual cure polymerization system.…”

“…The teeth from all the groups were stored at 377C and 100% humidity for 7 days in order to allow the sealers to set 16) . Afterwards, the roots were sectioned on the long axis using a precision cutting machine (Isomet, Buehler Ltd., Lake Bluff, IL, USA) under constant water coolant.…”

“…Several resin-based sealer materials have been developed in an attempt to minimize leakage by improving the effectiveness of the seal between the filling material and the root canal walls 15,16) . Different monomers were used in the 2 development of resin-based sealers.…”

Resilon: A Comprehensive Literature Review

“…It was concluded that a complete hermetic apical seal cannot be achieved with either of the two root canal filling materials. 69 In yet another study interfacial quality was compared between Epiphany and Epiphany SE and the surrounding dentin with conventional gutta-percha/AH plus root filling as reference for comparison. The results showed that nonbonding AH-plus/gutta-percha root fillings exhibited a significantly higher amount of gap-free regions and displayed significantly narrower gaps compared with the two adhesive root-filling groups.…”

Testing endodontic sealers on human umbilical vein endothelial cells

“…It is therefore important to test the biological effects and to identify the components that cause these effects, e.g. dissolved components of the dental materials [7][8][9][10][11]. Thus biocompatibility testing should use solid specimens as well as extracts.…”