The purpose of the study was to compare an adhesion strength of some modern enamel sealants to the enamel of a developing tooth which occurs without adhesive preparation of tooth surface. Materials and methods. In laboratory the shear adhesion strength to human teeth enamel without adhesive system application was compared for “Fissurit FX” (VOCO), “Clinpro™ Sealant” (3M™ ESPE™) and “Jen-Fissufil” (Jendental-Ukraine LLC). 30 samples were tested on tensometric system. Tests were performed according to requirements of ISO 4049:2019 “Dentistry – Polymer-based restorative materials” and ISO 6874:2005 “Dentistry – Polymer-based pit and fissure sealants”. Results and discussion. Performed experimental studies of sealant adhesion (without the use of adhesive systems, only with acid etching) showed that it was the largest in the domestic “Jen-Fissufil” – 9.80 ± 1.17 MPa (M=10.42 MPa, min – 7.41 MPa, max – 11.07 MPa); less in “Fissurit FX” – 9.78 ± 1.33 MPa (M=9.43 MPa, min – 8.23 MPa, max – 12.62 MPa) and “Clinpro™ Sealant” – 9.55 ± 1.88 MPa (М=8.69 MPa, min – 6.35 MPa, and max – 14.73 MPa). The performed statistical tests did not reveal any significant differences between the adhesion strength in all three subgroups. Due to the changes in the concept of dental caries development and approaches to its control that have taken place in dentistry over the past 30 years, the role of enamel sealants in achieving caries control in individual and communal prevention of dental diseases has significantly increased. The tendency to expand the indications for the use of photocomposite enamel sealants in clinical practice is also worth noting. In addition to their direct purpose, the materials can be used for “repair” and restoration of individual photocomposite fillings with minor wear and used as a lining material for the restoration of teeth with carious cavities with a high C-factor. Conclusion. In modern dentistry the use of enamel photocomposite sealants is one of the most effective and reliable methods of preventing caries of the occlusal surfaces of teeth. The study of shear adhesion to acid-etched enamel for photocomposite materials “Fissurit FX”, “Clinpro™ Sealant” and “Jen-Fissufil” did not reveal any significant differences. The technology of composite tooth enamel sealants is currently successful in clinical practice and continues to improve and develop. The development of new and quality improvement of such materials is an urgent issue for science and technology

Background. Dental caries is a widespread worldwide disease of multifactorial genesis. The leading mechanism of its development is a long-term imbalance of the physiological balance between the inorganic component of the teeth hard tissues and the liquid biofilm formed on their surface, the predominance of the demineralization processes in hard tissues over the processes of remineralization. The use of dental enamel sealants has proven to be effective in preventing and reducing the intensity of dental caries. Modern bioactive polymer sealants for enamel contain such remineralizing agents as sodium fluoride, nanoamorphous calcium phosphate, beta-tricalcium phosphate, and particles of bioactive glass. For all dental composite filling materials, mechanical stability is one of the prerequisites for the long-term clinical success of restorations and fillings, and accordingly, temporary protective structures made of sealants. Aim: to compare the flexural strength and modulus of elasticity of three modern photocomposite enamel sealants. Materials and methods. In laboratory conditions for three modern photocomposite dental materials for sealing fissures and pits of enamel "Fissurit FX" (VOCO), "Clinpro™ Sealant" (3M™ ESPE™) and "Jen-Fissufil" (Jendental-Ukraine LLC) a flexural strength (three-point test) and elastic modulus were determined in accordance with the requirements of the international standard ISO 4049:2019. 6 samples of each material, polymerized and kept for a day in humid conditions, were examined. Results. The highest elastic modulus and flexural strength were in "Fissurit FX" – 5.17±0.80 GPa (M=5.00 GPa) and 130.07±7.75 MPa (M=127.81 MPa), respectively. In "Clinpro™ Sealant" the elastic modulus was 2.97±0.12 GPa (М=3.00 GPa), the flexural strength was 100.01±14.33 (М=96.73) MPa. In "Jen-Fissufil" the elastic modulus was 3.47±0.52 GPa (M=3.17 GPa), the flexural strength was 90.91±6.66 MPa (M=93.02 MPa). The studied indicators of all three materials exceeded the requirements of the international standard ISO 4049:2019. Conclusion. The performed studies showed high mechanical properties of all three dental sealants for enamel and that they have the potential to withstand long-term periodic masticatory load when functioning on the surface of teeth.

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The objectives of the study was to compare the depth of polymerization of flowable photocomposite dental restorative materials for bulk fill tooth restorations in laboratory. Materials and methods. Three flowable bulk fill photocomposite dental restorative materials – "SDR® Posterior Bulk Fill Flowable Base," "Filtek™ Bulk Fill Flowable" and domestic "Jen-Radiance Molar-FW" – were chosen for the study. For each material, 10 black opaque thin-walled polyvinyl chloride molds with a length of 10.00 mm and a diameter of 3.00 mm were prepared. The molds were air-dried from a compressor and fixed in fluoroplastic retainers perpendicular to the metal opaque surface below and subsequently filled with the investigated restorative material along the entire length, in a contact manner, along the wall. After filling, the material was polymerized with an LED photopolymerizer directly in contact with the surface of the light guide for 40 seconds. Subsequently, the material was removed from the forms and the remains of the unpolymerized mass were removed from the surface of the polymerized cylinder of the composite with a metal dental sickle-shaped carrier (scarification test). The length of the polymerized cylinder was measured using an electronic micrometer. Results. Therefore, the study of the depth of polymerization of flowable bulk fill photocomposites "SDR® Posterior Bulk Fill Flowable Base", "Filtek™ Bulk Fill Flowable" and domestic "Jen-Radiance Molar-FW" showed that signs of polymerization of all three materials were observed in a depth of more than the "declared" four millimeters which may be explained by the improvement of the recipe for the preparation of such materials and the optimization of the transparency of the organic component and inorganic filler, as well as the regular distribution of photoactivators in the mass. "SDR" polymerized to a depth of 7.38 ± 0.17 (M = 7.30) mm, the minimum value was 7.16 mm and the maximum value was 7.71 mm. "Filtek Bulk Fill Flowable" polymerized to a lesser depth – on 6.34 ± 0.14 (М = 6.38) mm, the minimum value was 6.05 mm and the maximum value was 6.55 mm. The domestic analogue "Jen-Radiance Molar‑FW" showed even higher values of polymerization depth – 8.03 ± 0.19 (М = 7.98) mm, the minimum value was equal to 7.75 mm and the maximum value was 8.41 mm. Statistical tests showed probable similarity between "SDR" and "Jen-Radiance Molar-FW" in the depth of polymerization. Conclusions. All three studied flowable bulk fill photocomposite materials were polymerized to a depth greater than 4.00 mm. Domestic "Jen-Radiance Molar-FW" was similar to "SDR" according to the investigated feature.