An In Vitro Evaluation of Passive Ultrasonic Agitation of Different Irrigants on Smear Layer Removal After Post Space Preparation: A Scanning Electron Microscopic Study

Abstract

This study evaluated the removal of debris and smear layer after post space preparation using different irrigations and passive ultrasonic agitation. Sixty human premolars were decoronated and post space prepared after endodontic therapy. The samples were then randomly divided into three experimental groups (Groups A, B, C) and one control group (Group D) with fifteen samples in each group. Groups A and B samples were treated with 10 % citric acid and 17 % ethylenediamintetraacetic acid (EDTA), respectively and passive ultrasonic agitation was done, rinsed with sodium hypochlorite and finally flushed with saline. Group C samples were conditioned with 36 % phosphoric acid and then rinsed with saline. The control group was treated with 3 % sodium hypochlorite, passive ultrasonic agitation done and flushed with saline. The samples were sectioned and evaluated for debris and smear layer removal under scanning electron microscope. 10 % citric acid showed the best removal of smear layer when compared with 17 % EDTA and 36 % phosphoric acid, but was not statistically significant (p > 0.05). The difference in scoring for debris and smear layer removal in the coronal, middle and apical third of post space of experimental groups in comparison with control group was statistically significant (p < 0.001).

Cleanliness efficacy and effect on dentin microhardness of a novel plant extract irrigant

“…The important goal of irrigation is to remove the smear layer and debris (Srirekha et al 2013).The main two purposes of irrigation are to remove debris (the organic component) and to remove smear layer (mostly the inorganic component) (Sen et al 1995). An in vitro study conducted by Orstavik and Haapasalo (Orstavik and Haapasalo 1990) showed that the smear layer removal decreased the time needed for dentin disinfection with intracanal medicaments.…”

Effects of chelating agent and acids on Biodentine

“…Some studies have shown that PA has been deemed effective for root dentin smear layer and Ca(OH) 2 dressing removal . However, no study was found evaluating the effect of PA and MA on BD, or comparing with EDTA.…”

Effect of Intracanal Dentin Conditioning with Xylene, Phosphoric Acid and Chlorhexidine on Bond Strength to Glass Fiber Post with Self-Adhesive Cement

“…In our study, root dentin etching with 37% phosphoric acid improved the bond strength of self-etch adhesive system. Hybrid smear layer in self-etch adhesive systems is a weak area of bond to dentin and since this layer contains modified collagen fibrils, its bond strength gradually decreases and degrades [11]. On the other hand, mineral parts of the smear layer are strong buffers that increase the pH of acidic monomers and decrease their demineralizing ability [2].…”

“…During application of resin cements for intracanal post cementation, dentinal walls must be cleaned from gutta-percha debris and smear layer since the mechanism of bonding of resin cements is based on penetration of acidic monomers of the cement into dentin and dentin demineralization, which result in micromechanical interlocking of cement [2,7]. Previous studies attempted to clean the canal wall as much as possible [9][10][11]. Xylene is an organic solvent used for elimination of gutta-percha in endodontic re-treatment and post space preparation.…”