The condition of teeth in ancient populations living on the territory of Ukraine has been little studied. The aim of the work is to study the dental status of the 15th century Nogais, and to carry out a comparative analysis of the data obtained with the state of the dento-jaw system of medieval populations that lived on the territory of modern Ukraine in the 9th – early 15th centuries. The object of the study was 48 Nogai skeletons (main group) and 118 representatives of medieval cultures (control group). The research method was a method for analyzing the skeletal tissue of ancient people, developed by the authors. The prevalence and intensity of caries, the prevalence of dento-jaw anomalies, dental calculus and periodontal diseases were studied. Statistical analysis was performed using the Pearson χ2 test. It was found that the prevalence of dental caries in the main group is lower than in the control group (18.75 % and 37.28 % respectively, p<0.05). It was also found that this indicator significantly differed in men of both groups (p<0.05), while in women it did not differ (p>0.1). It was found that in the main group, compared with the control group, the frequency of primary adentia was higher (16.67 % and 6.68 % respectively, p<0.05), but the prevalence of anomalies in the position of individual teeth and occlusion was lower (4.17 % and 21.18 % respectively, p<0.05,). It was found that the prevalence of dental calculus in the main group is two times higher than in the control group (89.50 % and 41.0 % respectively, p<0.0001). Also, 15.0 % of Nogai men showed a decrease in the height of the alveolar process of the jaws, which is characteristic of periodontitis; in women, such changes were not found due to the low average age of survival. Thus, the 15th century Nogai population had a lower prevalence of caries and dento-maxillary anomalies than the medieval populations that lived on the territory of modern Ukraine in the 9th – early 15th centuries.

A paradigm shift in dental caries treatment in paediatric dentistry is viewed towards a wide using of composite resins. This prospective clinical trial are evaluated and compared during 18 months of clinical performance of a microhybrid composite with a nanoceramic resin composite placed in сlass I and II cavities in permanent teeth in children.  Thirty one children aged between 7 and 15 years were investigated during this study. About 40 restorations were performed, 50% for each material: a nanoceramic resin composite “Ceram. X Sphere TEC one” and a microhybrid resin composite “Charisma”. The restorations have been estimated by investigators immediately after complete polishing a filling. Clinical evaluation was performed 18 months after replacement by two other investigators using modified USPHS criteria. In addition to hand instruments, a magnifier was used for investigation of the restoration margins. Eighteen fillings with “Ceram. X Sphere TEC one” and 17 fillings with “Charisma” were available. The USPHS parameters were analyzed with the Chi-square test in18 months. The level of significance was p<0.05. Also Green-Vermillion index was used for oral hygiene estimation.  There are no failed restorations and secondary caries during the studied period. There were no statistically significant differences among the materials used (p>0.5) regarding the clinical performance. Green-Vermillion hygienic index was 1.48. Thirteen children (43.42%) showed satisfactory level of oral hygiene, 10 children (35.71%) demonstrated good level and 7 children (20.87%) – unsatisfactory level.  According to the marginal discoloration and surface roughness criteria, there were no significant differences among the restorative materials (p>0.5). Marginal discoloration was seen in children with unsatisfactory oral hygiene that corresponds to the data of recent study. Marginal adaptation rate was 94.95% for nanoceramic, and 82.35% for the microhybrid restorations. The marginal defects recorded had small detectable defects at the enamel margin of the restorations. According to the anatomic form criterion, there were no significant differences among the restorative materials (p>0.5). Postoperative sensitivity of one nanoceramic and two microhybrid restorations was scored as Bravo at baseline examination, but it disappeared by the 18-months evaluation. For color match criterion, the slight differences were observed in microhybrid restoration in 18 months. This shade mismatch was clinically acceptable (Bravo), with no significant differences noted between the materials studied (p>0.5). The nanoceramic and microhybrid composites have provided acceptable clinical performance over 18-months period. The research pertaining to bigger size of a studied sample and longer observation period is considered advisable to ensure the higher clinical success rate of nanoceramic than microhybrid composite in restoration of permanent teeth in children.