Improving the effectiveness of tooth preparation by using alternative methods

Summary. Preparation of hard tissues of teeth is an integral stage of the invasive method of treating caries and is a complex effect of various factors that make it possible to remove tissues affected by this process and the formation of a cavity of arbitrary shape, based on the principles of gentle preparation, which consists in the most effective removal of demineralized with the preservation of intact tissues. The aim of the study – determination of enamel and dentin surface aspects when using ultrasonic type of odontopreparation compared with the preparation of teeth with rotary instruments. Materials and Methods. Intact retinal teeth of the chewing group, removed by surgical indications, were used as material for the morphological study. After special preparation, the teeth were dissected using ultrasound with the help of special nozzles and in the classical way using rotary instruments, subject to the protocols of manipulations. Subsequently, histological preparations of these teeth were made and examined by light microscopy at magnification x 400. Results and Discussion. In the case of ultrasound preparation, single invaginations were visualized on the surface, which were dissociated by prongs and equal sections of dentin. The tips of dentin prongs are smoothed, the taper is about 800. The maximum height of the prong does not exceed 1.3 microns. In the area of the bottom and walls of the cavity all over the existing lubricated layer in the form of a thin structureless weakly basophilic line, smaller in area compared to the same in the cavity, prepared with rotary tools. At preparation with rotary instruments, small invaginations alternating with pronounced prongs were observed at the bottom and walls. Flat levels were not visualized. The taper of the prongs is about 600 the maximum height of the prong is 2.4 microns. In the region of the bottom and walls of the cavity along the boundary of the preparation, a structured layer is smeared in the form of a thin sharply basophilic line. Conclusions. The comparative characterization of dental preparation methods makes it possible to recommend an ultrasound method as a method of choice for a specific contingent of individuals, since it not only provides painless preparation and minimizes stress during dental procedures, but is also gentler on the morphological characteristics of hard dental tissues.