No 1 (2003)

Published data and independent observations on clarifying the pathogenesis of gnathic kerato-cysts are presented in the article. It was established that the so-called primary kerato-cysts develop repeatedly due to an aggressive proliferation and an active differentiation of the multi-layer flat epithelium into the jaw osteal tissue. This predetermines an aggressive and, probably, atypical clinical course.

Intact teeth, extracted due to medical indications in persons aged 20-25 and 60- 70, were irradiated by а у -unit "AgatP'. The teeth were irradiated in a irradiation regime identical to the one applied in the treatment of patients with malignant neoplasms in the head and neck. After that a tooth brush was used to treat the teeth with a tooth-paste containing the fine-dispersed hydroxy apatite (particle size - 1-2 mem), which was synthesized at the "Polistom" company; the procedure was repeated 4 times a day for 3 minutes each time with subsequent washing of the teeth under the flowing water. Prior to the treatment with paste, organic deposits and pellicula were removed by a 3-5% solution of Sodium Hypochlorite. The thus obtained material was examined by Electronic Scanning Microscopy. It was established, that the enamel of the irradiated teeth (especially of those extracted from elderly persons) had a larger quantity of defects and fractions, and their depth and width were bigger, either, as compared to non-irradiated teeth. The hydroxyapatite particles and their conglomerates fill in the formed enamel defects and fractions, whose width exceeds 2-3 \icm. Hydroxyapatite fills in such defects and it is not washed out by water for as long as 10 days, which is a reason for a clinical testing of the material in question.

The morphological characteristics of the medial incisor were studied anatomically, ondotoscopically, ondotometrically and rentgenologically both in male and female. The established factors can characterize such teeth in both male and female. We can make a diagnosis, when we deal only with two of such factors as minimum. Odonotoscopical characteristics were used as approximate facts.

The forensic medical aspects of mechanisms of damages to the maxillofacial parts was studied by using the information technologies and the engineering mechanics laws. Clinical cases of trauma were examined in 59 patients (both male and female), aged 16 to 60, who underwent treatment at the department of maxillofacial surgery of Voronezh regional clinical hospital. The study led to isolating two key types of maxillofacial trauma with regard for the forensic medical aspect, i.e. spontaneous falling and falling with acceleration as well as blow with some object. The study results are recommended for use in the forensic medical practice.

Crystalline aggregates of the mouth liquid were studied in 20 virtually healthy young male and female. 16 types of crystalline aggregates were systemized and described for the "normal" and "mixed" saliva.

The study was aimed at evaluating clinically the dental reconstructions made by using hybrid composite materials "Ecusite" (DMG-Hamburg) and "Charisma" (Heraeus Kulzer). A total of 40 reconstructions were examined according to the criteria of the Ryge direct clinical evaluation, including the edge adaptation, anatomic form, secondary caries, matching of colors, changes in the cavity-edge colors and roughness of surface. The study results showed that the above filling materials meet all clinical parameters according to the Ryge system; the application of these materials offers a more extensive choice for stomatologists in making reconstructions with regard for a individual dental color range of a patient, an absence of caries that could adjoin the dental stopping edge and for preserving an original anatomic form.

The clinical assessment of fillings made from restoration composite material "Filtek ™ Z-250" ("3M") showed a lack or an insignificant quantity of such complications like pigmentation of the dental cavity, manifestations of caries at filling edges and integrity of filling adhesion. Composite material "Fitek ™ Z-250" (3M) is feasible for a comprehensive use as a restoration composite in the dentist practice.

The authors studied the elementary composition of salivary and dental calculi in 16 patients with salivary-dental pathology by using the method of laser mass-spectrometry; the target of the study was to work out the prognostication criteria to evaluate the discharges of the salivary glands. The obtained results are indicative of that the elementary compositions of salivary and dental calculi have quantitative but not qualitative differences, which proves that they are of the same origin, i.e. from saliva. Besides, the authors did not establish any reliable difference in the elementary composition of the dental calculus irrespective of the lithotripsy results. The organic basis (carbon) as well as iron and nickel prevail in the composition of the salivary calculus, which is a hard object for lithotripsy.