Study on the surface of resins that burn without residues in the lost-wax procedure.

Statement Of Problem: When compared with waxes and prefabricated components made of dental alloys, processing resins is difficult and often results in a less accurate fit. The exact linear dimension is hard to realize, as the materials required for a dental casting are adjusted to dental waxes, and usually there are no special processing instructions for these resins.

Purpose: The surface structure of 16 residue-free burning resins was determined to find which could enlarge the range of application for waxes in the dental casting technique.

Long-term electromyography as a possible diagnostic aid for detecting craniomandibular dysfunctions.

As there is a positive correlation between oral parafunctional habits and craniomandibular disorders, objective electromyographic findings on parafunctional jaw activities could be very interesting for the diagnosis and management of craniomandibular disorders. The described pocket-sized and battery-operated electromyographic measuring device fulfils the essential requirements for monitoring and recording parafunctional activity in a chosen time period. It is easy to handle and can therefore be operated by a trained patient.

[Functional craniomandibular disorders and ENT-symptoms].

Complaints in the otolaryngologic region, that cannot be referred to an otolaryngological pathologic process, are often caused by or combined with craniomandibular dysfunctions. As a rule these complaints are not the result of direct mechanical irritation of the articular tissues, but the effect of neuromuscular incoordination and spasms. Consequently the term "Costen's syndrome" is obsolete and should be used no more.

[Economic aspects of use of alternative dental alloys].

A cost calculation for different types of dental alloys was carried through all stages of production. Recycling and scrap material values were included. Results showed that over an estimated 20 years of usage, the higher annual cost for bridges cast with a high gold alloy in relation to those with lower gold content alloys is not that significant that from the patients point of view the lower alloys should the choice.

[Determination of transverse resilience of human temporomandibular joint].

Transversal TMJ-resiliency is defined as a possible movement of the condyles exclusively in the lateromedial direction. The extent of this individual and variable shifting of the condyles can be recorded and reproduced using high-resolution electronic axiography and a special manipulating technique by the dentist. A study on 52 patients showed an average value of 0.

[The neuromuscular effect of anterior guidance on the protrusive movement pattern of the mandible. Observations in the horizontal plane].

The influence of a temporarily altered anterior guidance on mandibular movement patterns of tooth-guided and non-guided protrusion was examined in a clinical study on 20 patients, all with complete sets of teeth. Registration and recordings of movements were done with the computer-aided ultrasonic measuring system MT 1602. Based on an average measuring time of 40 min for each patient the main results were as follows: 1.

[Comparative analytic occlusal study of clinical use of T-scan systems].

Occlusal corrections are dependent on a precise registration. The T-Scan system has recently been presented to the market as an innovative, computer-aided device, capable of providing exact information regarding position, strength and frequency of occlusal contacts. The diagnostic validity of this technique was tested in a comparing study on 16 patients.

[Is the T-scan system a relevant diagnostic method for occlusal control?].

The T-Scan system has recently been introduced to the market as a computer-aided device for direct monitoring and documentation of individual occlusal patterns. To receive first assessments of diagnostic relevance of this method, sensitivity and planar resolution capacities of the T-Scan system was tested in an in-vitro study, that showed a lack in the resolution capacity and an excessive variation in sensor sensitivity. Therefore the clinical use of the system is very limited.

[Influence of occlusion on head posture during prolonged phases of clenching].

The influence of divergent splint-adjusted maximum intercuspation on head posture during prolonged phases of clenching was studied in five subjects. During clenching in maximum intercuspation profound changes of head posture were observed, if intercuspation was not harmonized with an upright posture of head and body. Since the interrelation between occlusion and head posture is established a comprehensive approach of orthopedic, physiotherapeutic, and dental measures, in particular for the therapy of myoarthropathy patients with cervical spine symptoms seems appropriate.

[Possibilities and limits of prosthetic rehabilitation of the reduced dentition].

The initial findings are crucial for determining the time and the extent of possible prosthetic treatment. The patients to be fitted with a prosthesis are divided into several groups, on the basis of the present state and the reaction of the masticatory organ to external irritation, into resistant and insufficient states. The topography (not the number) of abutment teeth, the relationship of the edentulous parts of the jaw to the number of remaining teeth, the extent and the course of future prosthetic surfaces, the possibility of the equilibrium and distribution of force, the antagonistic relationship of the teeth with each other and hygienic factors limit the prosthetic possibilities.

[Stability of temporomandibular joint relations in the edentulous].

Loss of teeth causes a change in the relationship of the mandibular condyles to the articular fossa of the temporal bone. The movement of the joint is pathologically restricted by the relation of the articular disc. The study showed that the function of the masseter muscles could be normalized with a modified Shore bite path plate.

[Microstructural studies on abraded facettes in the dentin].

Using transmission electorn microscopy, a homogeneous deposition on abrasion facets in the dentin was observed in sections. This deposition ranged between 0.2 and 0.