No 5 (2009)

Three-dimensional models were used to perform a numerical study to define the dependence of the distribution of tension fields and deformations in the implant-bone system on the diameter, length, and the screw thread of the implant. Four kinds of dental titanium implant produced by Konmet, Russia, were studied: 13- or 19-mm implants with or without thread having a diameter of 3.3 or 4.0 mm. In all the variants the abatment was loaded with a vertical load of F = 0.5 kg. The implant movement under two different boundary conditions was minimal when a 19.0-mm implant with a 4.0-mm diameter was used. When the diameter of a screw thread implant was increased by 20%, it decreased maximal implant movement under vertical load by 50%, and maximal tension at the implant apex by 70%. When the length of an implant was increased by 46%, it decreased its maximal movement under vertical load by 40%, and maximal apical tension by 20%. The absence of screw thread in a dental implant increased maximal implant movement under vertical load 1.36 times, and maximal apical tension 1.2 times.

In an experiment, the effects of various cleaning tablets and SHF irradiation on the adhesion index of the virulent anaerobic agent Prevotella melaninogenica to samples of the polymeric material Villacryl Soft (Zhermack) for elastic and Villacryl H (Zhermack) for hard bases were studied. The study demonstrated a high antiadhesive effectiveness of Corega tablets and SHF waves. A clinical investigation, in which 46 patients with removable prostheses participated, confirmed the efficacy of Corega tablets compared to conventional method of prosthesis care.

The authors describe a case of a three month-old blunt bullet wound of the neck. Despite the fact that the presence of the bullet did not manifest clinically, the bullet was removed surgically because it was located closely to a large arterial vessel (according to angiography), which could lead to arterial wall arrosion afterwards. Radiography had not been able to determine whether a surgery was indicated.

Four hundred and fifty-five elderly dental patients were examined. In 368 (80.5%) patients the following disturbances were revealed: organic anxious disorders (F06.4, 127 cases, 34%); mild organic cognitive disorders (F06.7, 52 cases, 14.1%); organic depressive disorders (F06.32, 31 cases, 8.3%); organic personality disorders (F07.0, 42 cases, 11.3%).

Periodontal pathology is one of the most widely spread one, and its prevalence nowadays is not lower than previously, which proves the inconsistency of the existing so called complex treatment. In everyday practice, the assumed treatment complexes mostly present interpolation of various means of palliative medication, allowing for only short-time effect. In fact, the only procedures from the complex of ones necessary to treat patients with periodontal diseases, performed on patients seeking help are usually removal of deposit and local medication processing. Dentists of different specialties, not to mention physicians, cardiologists, endocrinologists, and even psychologists, do not participate in discussions on management programs. Thus, only a clear program of observational, therapeutic and prophylactic measures will make it possible to fulfill main principles of prevention of periodontal diseases.

An analysis of the condition and quality of dental treatment of 500 North Osetia-Alania residents was carried out. The patients chose dental treatment according to such parameters as the quality of aid, the availability of modern equipment in the medical facility, and the use of new materials and medications.

The article presents results of a study of salivary fluid with superweak irradiation, reflecting the state of non-specific immunity and favoring the manifestation of various unfavorable effects in petrochemical industry workers. The study found that individuals contacting with chemical pollutants displayed substantial oral fluid chemiluminescence.