PECULIARITIES OF THE PERMANENT TEETH ENAMEL RESISTANCE TRANSFORMATION IN CHILDREN WITH MALFORMED TEETH

Liubarets S. F.

DENTISTRY

Scentific article

The author has analyzed the data of the enamel resistance (ERT) and enamel acid biopsy test (EAB) for calcium and fluoride content in the enamel of permanent teeth of children with malformed teeth who referred to different somatic status groups. 584 children have been examined. The following groups were recognized: group 1‑children with dental malformation disorders, referred to the 3rd health status group; group 2‑children with dental malformation disorders, referred to the 2nd health status group; group 3‑children with dental malformation disorders, exposed to radiation after the Chornobyl accident, referred to the 3rd health status group. Groups 1,2 and 3 were subdivided into subgroups according to the dental malformation subtype: children with enamel systemic hypoplasia (groups 1a, 2a and 3a appropriately); children with molar‑incisor enamel hypomineralization (groups 1b, 2b and 3 b appropriately). The control group №4 was represented with children referred to the 2nd health status groups, without dental malformation disorder. The informative value of the figures applied for evaluation of the permanent teeth resistance in children with dental malformations was confirmed by the dispersive analysis: ERT (F = 29.70, р ˂ 0.001), EAB of the affected enamel (Са, Р) (F = 3.86, р ˂ 0.01; F = 3.93, р ˂ 0.01, respectively), EAB of the intact enamel (Са, Р) (F = 6.35, р ˂ 0.001; F = 5.16, р ˂ 0.001, respectively). Mean average of the ERT among the examined children made up (4.80 ± 1.35). The ERT in children with dental malformations correlated with the average resistance degree and proved average resistance for caries. The reliably higher figures were established in groups 2а, 2b and 3b when compared to group 4 (р ˂ 0.05). The Са and Р content in the affected and intact dental enamel areas of all examined children made up, respectively, (0.31 ± 0.22) mmol/l; (0.33 ± 0.28) mmol/l; (0.53 ± 0.48) mmol/l and (0.58 ± 0.31) mmol/l. The detection of Са within the permanent teeth affected enamel regions in children with hard dental tissue malformations revealed significantly lower figures in groups 1b, 2а, 3а, 3b and in group 2b compared to the control data (р ˂ 0.05, р ˂ 0.05, р ˂ 0.05, р ˂ 0.05 and р ˂ 0.01, respectively). The above ‑ mentioned macroelement content was reliably lower in the intact enamel of people with molar ‑ incisor enamel hypomineralization referred to the 2nd health status group (group 2b) compared to group 4 (р˂ 0.05). The fluoride content in the affected permanent teeth enamel in patients with dental malformations ranged from (0.29 ± 0.21) mmol/l to (0.43 ± 0.32) mmol/l, being significantly lower in groups 1b, 2а, 3а, 3b, when compared to group 4 (р ˂ 0.05). The Р content in the intact permanent teeth enamel was significantly lower when comparing the data of group 2b to group 4 (р˂0.01). So, the ERT data in patients with dental malformations corresponded to the mean average resistance level and evidenced about their average resistance to caries. The ERT in children with systemic enamel hypoplasia and molar ‑ incisor enamel hypomineralization was equal except for the people with severe radiation anamnesis, with brightly manifested tendency for decreased dental enamel resistance. The results of the acid enamel biopsy show that calcium content in the affected and intact enamel of the permanent teeth was lower in those inhabiting the territories, contaminated with radionuclides, patients with dental malformations referred to the 3rd health status group. The abovementioned changed may be stipulated for a complex of factors, including the ionizing radiation. The detected enamel resistance disorders in children with dental malformations may present a valuable complication risk factor, caries in particular.

children, teeth, hypoplasia, calcium, phosphates

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«Bulletin of problems biology and medicine» Issue 4 part 1 (146), 2018 year, 287‑290 pages, index UDK 616.314.13.‑053.2:616.314.‑007.1

10.29254/2077‑4214‑2018‑4‑1‑146‑287‑290