Three-dimensional Quantitative Porosity Characterization of Syringe- versus Hand-mixed Set Epoxy Resin Root Canal Sealer

Abstract

The aim of the present study was to compare the porosity characteristics of AH Plus Jet(tm) syringe-mix and the conventional hand-mixed AH Plus root canal sealers by three-dimensional quantitative high-resolution micro-computed tomography (micro-CT). Seven test specimens were prepared from each tested sealer by a single operator following the manufacturer's instructions and poured into pre-lubricated plastic split-ring moulds. Set sealer test specimens were scanned using a micro-CT device and the shadow images were reconstructed into cross-sectional slices. The evaluated parameters were (i) total pore count, (ii) total pore volume and mean pore volume, (iii) total porosity (% of pore volume in relation to total sealer volume) and (iv) mean pore distance to the sealer lateral external surface. In both groups, most pores were localized within the external sealer perimeter (0.05 mm from the external surface). Hand-mixed AH Plus specimens showed statistically significant higher mean total pore count, total pore volume and total porosity (p=0.001) than the syringe-mixed specimens. However, mean pore sizes in AH Plus syringe-mixed specimens were significantly higher (p=0.046) than the AH Plus hand-mixed counterparts. Hand-mixed AH Plus was associated with higher total mean pore count, volume and total porosity compared to syringe mixed AH Plus.

Porosity analysis of MTA and Biodentine cements for use in endodontics by using micro–computed tomography

“…There are studies that have analyzed that the solubility of a duct sealing material is in permanent relationship with the porosity that this material may have ( 7 , 8 ). The porosity and other defects of the microstructure of the endodontic sealant can produce foci of structural weakness and tensile strength of the material, producing microcracks ( 9 ).…”

Physical properties of a new resin-based root canal sealer in comparison with AH Plus Jet

“…Automatic mixing provides better homogenization of the pastes in an ideal ratio and improves the physicochemical properties of the sealers. 7 Recently, a new resin-based endodontic sealer with mixing syringe, Any-Seal (Mediclus, Cheongju, Korea), was launched into the market. According to the manufacturer, it consists of ethylene glycol salicylate, epoxy oligomer resin, zirconium oxide and calcium phosphate.…”

Assessment of the Antioxidant Effect of Ethanolic Extracts Obtained from Agrimonia eupatoria L., Filipendula ulmaria (L.) Maxim. and Filipendula vulgaris Moench Collected from the Estern Part of Romania

“…Plants, vegetal products or secondary metabolites are widely used nowadays due to their beneficial effects in human health for both prevention and treatment in a wide variety of diseases [1]. An increased number of studies involving medicinal plants have been conducted due to their potential beneficial effects in severe pathologies, including cancer [2], cardiovascular diseases, diabetes, pulmonar y and brain diseases [3,4]. One of the mechanisms responsible for the protective effects is considered to be plants capacity to reduce oxidative stress [3].…”

“…An increased number of studies involving medicinal plants have been conducted due to their potential beneficial effects in severe pathologies, including cancer [2], cardiovascular diseases, diabetes, pulmonar y and brain diseases [3,4]. One of the mechanisms responsible for the protective effects is considered to be plants capacity to reduce oxidative stress [3]. The oxidative stress is considered to be an imbalance in the redox homeostasis between the excessive production of reactive oxygen species (ROS) and an impairment in the antioxidant capacity [5].…”

“…[6]. The antioxidant effect can be due to single molecules within the extract or to the synergy of different phytochemicals [3].…”