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Biomedical subjects

U Ehmer

Publications and source records attributed to U Ehmer.

At least 37 records · Page 2Linked to original sources
PubMed1993

[The validity of the degrees of asymmetry in computer-supported analyses of the frontal x-ray image].

The aim of the study presented here was to evaluate the efficacy of symmetry indices when using a specially adapted computer aided mandibular analysis of symmetry degree (CMS). By means of using a series of anteroposterior cephalograms with experimentally simulated rotations and tippings of the two mandibles under study (one ideal symmetric, one severe asymmetric), it proved possible to quantify significant distortions in the degree of symmetry. It was possible to demonstrate that the determination of percentual symmetry degree is a helpful diagnostic tool in the case of skeletal mandibular asymmetry. In the two-dimensional projections of posteroanterior cephalograms, however, computer aided differential analysis of the functional and skeletal components of asymmetry were not shown to be valid. This finding can thus be generally applied to all exclusively posteroanterior cephalogram related symmetry indices.

Cephalometry↗
PubMed1992

[A comparison of the clinical and instrumental functional findings in subjects with Angle class II/2 versus a eugnathic group].

On the basis of a clinical and functional analysis, the diagnosis of a group of patients with Angle class II/2 malocclusion is compared with a control group with normal occlusion in a statistical study. The present study confirms the tendency revealed in the literature for patients with an Angle class II/2 malocclusion to more frequently show symptoms of a myoarthropathy. However, our results failed to confirm the assumption made in previous studies that class II/2 patients have a steep condylar axis. In particular in patients with relatively vertical upper incisors and a deep bite, a functional analysis should be done at the start of treatment. In the event of problems being found, the primary aim of therapy is the correction of the upper incisor angle.

Adult↗
PubMed1992

Mandibular border movements and masticatory patterns before and after orthognathic surgery.

To study the effects of combined surgical-orthodontic treatment, recordings of functional and border movements were obtained before and after surgery for 16 patients with severe skeletal malocclusions. The tracings showed a clear difference in the functional adaptation to mandibular setback and mandibular advancement surgeries. Patients with a skeletal Class III malocclusion who had undergone mandibular setback surgery generally showed an increase in the range of border and masticatory movements postsurgically. Patients with a skeletal Class II malocclusion corrected by mandibular advancement showed a restricted range of motion immediately postoperatively. Even 12 months after surgery, their recordings did not completely approach presurgical values.

Adult↗
PubMed1991

[Gnathographic study of mandibular borderline movements and chewing patterns before and after surgical dysgnathia correction in retrognathism and prognathism].

Chewing patterns and longitudinal border movements of 16 patients with severe dysgnathia were examined preoperatively and up to 12 months postoperatively by means of sirognathographic records of surgical-orthodontic treatment results. Patients with a skeletal class-III malocclusion showed an increased range of movement compared to the preoperative situation, after a surgical mandibular setback performed by wire osteosynthesis, followed by an intermaxillary immobilisation of 6 weeks. Patients with a skeletal class-II malocclusion showed a considerably limited range of movement during the first postoperative registration after a surgical mandibular advancement. The preoperative situation had not been fully achieved even after 12 months. The postoperative sirognathographic records present distinct differences in functional adaptation between surgical mandibular advancement and mandibular setback.

Adult↗
PubMed1990

[Growth and therapy in Angle class II/2--a longitudinal cephalometric study].

The influence of both growth and functional therapy with the U-Bow-Activator Type I on Angle class II subdivision 2 malocclusion is analysed in a cephalometric long term study. Findings concerning skeletal problems: 1. Therapeutically intended clockwise rotation of the mandible with vertically and sagittally controlled maxillary position, 2. achieving normal sagittal mandibular growth rates. Dental problems are improved significantly. The results obtained by functional therapy and growth proved to be stable in the post-treatment check-ups.

Activator Appliances↗
PubMed1990

[The effects of orthodontic treatment on periodontal findings in adults].

After periodontal therapy 12 patients with advanced alveolar bone loss were orthodontically treated and recalled for approximately 51.1 months. Orthodontic tooth movement resulted in a mean overjet reduction of 1.7 mm, a mean overbite reduction of 1.3 mm and closure of the anterior spaces. No significant differences were observed in the probing depths and attachment levels between the test and control teeth. 31% of the treated teeth showed signs of root resorption. The results indicate that orthodontic therapy in patients with successfully treated advanced periodontal disease does not lead to further attachment loss if the patients are periodontally well maintained.

Adult↗
PubMed1989

Calibrated double split cast simulations for orthognathic surgery.

A cephalometric prediction tracing serves as a guideline for orthognathic surgery. Transfer of information from prediction tracings to cast simulation (model surgery) is part of treatment planning for surgical correction of dentofacial deformities. Articulated mounting with calibrated double split casts adds precision to the process and makes the final cast operation more effective. Systematic errors in the transfer of information are appraised critically.

Audiovisual Aids↗
PubMed1978

[Median superior diastema--definition, etiology, symptoms].

The definitions, aetiology, and symptomatology of the diastema mediale superior are discussed in the present study on the basis of personal experience and reports in the literature, special attention being paid to the verbal evaluation of "genuine" or "spurious".

Diastema↗
PubMed1977

[Distribution of praevalent morphological symptoms of the oral complex in 600 Jena school children in dependence of age and sex (author's transl)].

In this study praevalence and stage of some selected symptoms within the orofacial complex were investigated in 600 normal children living in Jena (300 boys and 300 girls). The first problem of this study consisted in registering the biological variability of 6 symptoms (bit abnormality, protrusion of the lower lip, diastema, palatal height, size of the tongue, fissured tongue) in a normal group, and secondly to find correlations between these symptoms. The results are listed for the age groups according to sex. The supposed causes that may lead to the development of these symptoms are discussed. Our results were compared with those of the literature. Difficulties and incompletion are involved in recording of the mentioned symptoms and their value of diagnosis.

Adolescent↗
PubMed1976

[Results from a study of the normal values in the vertical, sagittal and transversal plane of early mixed dentitions].

168 (21.7%) of 776 pupils from primary classes in Jena had normal tooth position and occlusion. 94 of them were selected for a longitudinal study. Up to now, they have been examined at the ages of 7 and 8 years. The evaluation of the results obtained showed differences with regard to age and sex. The data reported and the deviations observed may be considered reference values. They concrete the assessment of the growth and development in the orofacial system, facilitate the recognition of dysgnathias which must be treated and optimize the planning and performance of orthodontic treatment.

Cephalometry↗