The influence of smear layer in lateral channels filling

Abstract

This in vitro study evaluated the ability of a warm gutta-percha obturation system Thermafil to fill lateral channels in presence/absence of smear layer. Forty single-rooted extracted human teeth were randomly divided into two groups for which different irrigation regimens were used: group A, 5 ml of 5% NaOCl + 2.5 ml of 3.6% H(2)O(2); group B, 5 ml of 5% NaOCl 5% + 2.5 ml of 17% ethylenediamine tetraacetic acid. A conventional crown-down preparation technique was employed. Obturation was performed using epoxy resin-based cement (AH Plus) and a warm gutta-percha plastic carrier system (Thermafil). Specimens were cleared in methyl salicylate and analyzed under a stereomicroscope to evaluate the number, length, and diameter of lateral channels. Lateral channels were identified in both groups at medium and apical thirds. Additional samples were prepared for scanning electron microscopy inspection to confirm the presence of smear layer in group A, and the absence of smear layer in group B. All lateral channels resulted filled in both groups. No statistically significant differences regarding number, length, and diameter were observed between the two groups. Smear layer did not prevent the sealing of lateral channels.

A Comparative Study on the Frequency, Location, and Direction of Accessory Canals Filled With the Hydraulic Vertical Condensation and Continuous Wave of Condensation Techniques

“…Some authors also used this method to investigate the occurrence of microleakage after root canal filling with different techniques (13)(14)(15)(16)(25)(26)(27). Venturi et al (9,14,15,17), Almeida et al (13), and Bertacci et al (28) studied the filling of lateral canals with different techniques and materials using this method. This present study was based on these studies to evaluate ramifications filled with two different filling techniques.…”

Comparison of the push-out strength of two fiber post systems dependent on different types of resin cements

“…They also undergo hydrolytic degradation, and their coefficient of thermal expansion is different compared to natural tooth substance and ceramic materials [70]. Furthermore, a smear layer is present after preparation of the root canal dentin, which can be removed effectively with different solvents in combination with EDTA [71,72]. The effects of these parameters and possible interactions with various irrigation protocols after root canal preparation on the long-term stability of glass fiber posts should be analyzed in future studies.…”

Effect of Six Obturation Techniques on Filling of Lateral Canals

“…However, irrigation with EDTA was shown to have no effect on the filling quality of root canal ramifications in several studies (20)(21)(22). In the present study, after the lateral canals were drilled, smear layer was created in order to mimic the clinical conditions and smear layer was not removed.…”