The microstructure and marginal fitting of materials used in treatment of teeth with fractured apical constriction

Abstract

Good quality obturation of the root canal and the right choice of cement is the main factor of its reinfection. A wide apical lumen, more often of inflammatory genesis, virtually eliminates the possibility of root canal sealing. . The morphology of root canal obturation of teeth with destroyed apical constriction and the effect of restorative material on the root dentin of Foredent, Sealapex and Trioxident endohermetics were studied using a scanning electron microscope and an energy dispersive spectrometer. Slices of 15 roots of extracted teeth were prepared for each sealant. . Foredent showed ubiquitous short but fairly wide micro-gaps (~16.9 µm) and many small micropores of ~0.87 µm, located at the junction of large and small microparticles, this may be the result of shrinkage during material curing. Sealapex is a homogeneous consistency material with a small number of micropores (~7.32 μm), but a high content of micropores (~0.86 μm). In Trioxident, there were single micropores (~1.11 μm), and the micropores between the particles were filled with a gel-like mass, i.e., unlike previous materials, they were not voids. The polymerization process of restorative materials leads to shrinkage and the formation of microcracks and micropores in them. The moist environment in the periapical space contributes to the retention of moisture in the Trioxident filling material and, therefore, contributes to its hardening. The presence of the process of hydration in Trioxident cement, its tight adhesion to the walls of the root canal allows us to assume that its use for orthograde filling the root canal will prevent the resorption of filling material in the apical part of the tooth root and prevent the progression of the pathological process in the periodontium. . The presence of the hydration process in the Trioxident cement, qualitative obturation of the apical zone, tight adhesion of Trioxident to the hard tissues of the root allow recommending the use of this material for orthograde filling of root canals of teeth with destroyed apical constriction. This filling material creates a kind of a monoblock firmly bonded to the root canal wall.