[Use of a new biological factor--exogenous nitric oxide--during surgical treatment of periodontitis].

In order to improve the efficiency of surgical treatment of periodontitis, the operative wound was exposed to nitrogen oxide (NO) during osteogingivoplasty and on days 3, 5, and 6 after it. Clinical and laboratory data making use of the cytomorphometrical method indicate that NO exposure decreased and maybe prevented secondary injury to the operation wound in up to 46.6% patients, which was confirmed by decrease and even normalization of destruction index and inflammatory destructive index on days 7 and 14, which was not observed in the reference group patients not exposed to NO.

[Cytological indices as criteria for assessing periodontal status].

The authors define the complex of criteria for analysis of cytograms of gingival impressions in health and periodontal diseases. Such criteria are needed for objective diagnosis and monitoring of periodontal status over the course of treatment. All the cellular elements were taken account of: different types of epithelial cells, including those with signs of cytopathology and bacterial contamination, connective tissue cells, mononuclears, leukocytes, and fibroblasts.

[The characteristics of the contact area of an endoprosthesis made from Ostek graphite-based material and of the mandibular bone fragment].

Interactions between endoprostheses made of carbonic composition "Ostec" and bone tissue were studied after plastic repair of experimental vast defects in the mandible in 22 rabbits and 10 dogs over the course of 2 years. Histologic findings showed the formation of a layer of fibrous connective tissue 3 months after the operation and later; at some places the implant directly joins the rabbit bone, which frequently undergoes chondroid transformation. Microscopically, the structure of "Ostec" represents carbonic threads forming large bundles.

[An experimental trial of a hydroxyapatite-based root paste].

Hydroxyapatite-based radicular paste was tried in 12 dogs with experimental chronic periodontitis. Hydroxyapatite, zinc-eugenol, and resorcin-formal pastes were compared. The periodontal status was assessed by morphometric methods.

[Structural changes in the periodontal tissues under measured exposure to intra- and extraoral orthodontic appliances in the unstable bite].

Study of the histological characteristics of the teeth, dental rudiments, and periodontal tissues of animals during distraction of the maxilla and distal dislocation of the mandible by "minor", "medium", and "strong" force showed that the type and degree of morphological changes are related to the strength of exposure and duration of orthodontist device application. The minor (1.2 H) and medium (2.