The author proposes to utilize the properties of thermosetting plastics used in other fields to use them in prosthetics in order to eliminate undercuts. Application of extra equipment in claspograph in the form of studs of three dimension makes formation of undercuts' blockade easier improving the result of work at the same time.

The review paper describing the presently used principles of the theory of teeth positioning in complete prostheses. The author indicates their advantages and disadvantages, and the possibility of their application in general prosthetic practice.

The possibilities of an efficient and safe maxillary--orthopaedic intervention in adult patients in order to eliminate or diminish the intensification of some malocclusion have been discussed in the paper. It enables to achieve the full functional--esthetic effect of the prosthetic treatment. The results of the combined treatment of the patients with common defects, i.e. hypodontia of lateral incisors and deformities towards the front, that create disturbances in prosthetic treatment planning have been given as an example.

Fixed dentures carried out by current laboratory method require to create potentialities of accurate separation of the working part of the model from its base preserving reciprocal parallelism of abutment elements. Modern engineering has at its disposal two methods of parallel location of stabilizing pins in model by means of devices produced in west European countries. Instructive needs and shortage of the appliance of this type on our market have made us elaborate our own design. In the design optical and mechanical elements available in the country are used and it meet exactly the requirements particular about devices of this type.

The authors have presented the structure and potentiality of application of a new optoelectronic device called stereognathograph recording the function of mandibular condyles. The meter circuit of this device is placed on the sick's head and connected with the mandible's teeth by means of a peridental splint. It enables to record mandible's movements and in the view onto the horizontal and pterygoid plane and determine the mandibular condyles' position in relation to the chosen reference point in terms of measurable numerical three-dimensional quantities. Furthermore this device enables to designate the axis of rotation of mandibular condyles as well as to designate Bennet's angle and pterygoid angle precisely for individual setting of the SAM-2 articulator.

The authors used ionophoresis applied with an apparatus of own design in 32 patients with posttraumatic changes in the temporomandibular joints. In 24 cases xylocaine and in 8 cases hydrocortisone were used. In 27 cases disappearance of pain was achieved and complications were not observed. The apparatus of own design was applied also for analgesia for operations on the middle ear through the external meatus, and in the treatment of ear buzzing and otalgia of unknown origin.

The purpose of the study was determination of changes in the content of calcium, phosphorus and fluorine in young dental calculus developing in vivo in case of not using a rinsing solution of 1% NaF or after its use. The studied material comprised tartar deposited on a foil fastened to the lower incisor in 6 women aged 23-28 years. They were divided into two groups of 3 women in each, one of the groups had a high tendency for mineralization of tartar, while in the other group this tendency was small. The study was carried out in two stages. In the first, control, stage at the time of foil wearing the women rinsed mouth with a placebo solution, in the experimental stage they used 1% sodium fluoride solution for this purpose. The analysis of the superficial distribution of various elements showed a greater density of impulses in the case of calcium and fluorine, and lower density in the case of phosphorus in the deposits formed in the experimental stage as compared to the control stage. Using X-ray microanalysis a statistically significant rise was found of the concentration of calcium and fluorine, and reduced content of phosphorus in the deposits formed after NaF application. The per cent in weight of fluorine in young supragingival tartar from the control stage was 0.2-3.1, while in the experimental stage it rose to 3.0-27.7. The statistical analysis showed that the rise of fluorine content in tartar in cases with low tendency for mineralization of tartar (group II) was statistically significantly higher than in the group with a high tendency for tartar development (group I). The Ca/F ratio calculated on the basis of the results in the control stage was 1.35 to 2.68. After application of fluoride rinsing solution this value rose to 1.96 to 4.34 in the studied women.

The influence of pyralgin, acenol, hydroxizinum and scopolan administered orally on the amount of the saliva excreted and pocket fluid as well as one the patients' feeling during stomatological treatment has been examined by the dual blind test method. The examinations haven't proved any significant influence of these drugs on the excretion of the saliva and pocket fluid of a statistical importance; these drugs, however, have reduced the painfulness of the operations depending on hard dental tissues processing. Among the drugs applied Pyralgin has proved to be the most useful drug for patients premedication before stomatological treatment.

A study was carried out on the incidence and possibility of collective treatment of non-occlusal parafunctions in 216 elementary school children aged 7-14 years. Two objectively detectable non-occlusal parafunctions were analysed: nail-biting and pencil-biting. The study included four meetings during which the fingernails and pencils were inspected in all children and a talk was given, explaining the harmfulness of motor habits in the masticatory system, and the children with these habits were told to replace them with other non-harmful movements as habits. Among 216 children 131 (60.6%) had such non-occlusal parafunctions with nail-biting in 51.9% of them, and pencil-biting in 31%. In 22.2% both habits were found. During the third control visit the overall incidence of both parafunctions was found to be decreased, from 60.6% to 37.9%. Elimination of nail-biting was obtained in 37.5% of cases, and pencil-biting in 64.2%, with the proportions of treated children varying in various classes. The study showed that nail-biting and pencil-biting are widely spread habits in the studied population and that collective treatment of these parafunctions is possible.