Biomedical subjects

U Hirschfelder

Publications and source records attributed to U Hirschfelder.

At least 37 records · Page 2Linked to original sources

PubMed1991

[Treatment planning in skeletally fixed laterognathism--an interdisciplinary task].

To achieve favourable aesthetic and functional results in treatment of skeletal facial asymmetry, a proper morphologic diagnosis based upon detailed information is essential for combined orthodontic and surgical treatment planning. In seven cases it could be shown that CT-scans and three-dimensional CT-surface reconstructions are far more efficient than conventional X-ray techniques in analysing the individual pattern. An excellent possibility of morphologic classification is offered in combination with the skeletal classification of head X-rays. The importance of a morphologically orientated treatment plan is emphasized by selected cases. Therefore various methods of operation in maxillofacial surgery can be planned better in advance and in orthodontics, with regard to the complexity of the case, it presents a better coordination of timing in the use of fixed and functional appliances.

Adult↗

PubMed1991

[Findings following functional orthopedic treatment of TMJ fractures in the growth period].

80 children and teenagers at the age of 3 to 14 years with isolated TMJ fractures were only treated by means of functional orthodontic appliances. After an average period of 3 years after the fracture they could be followed-up clinically, as well as radiographically. TMJ function turned out to be good in all patients. The morphological regeneration was often incomplete in older the patients and especially in deep dislocation fractures.

Activator Appliances↗

PubMed1991

[Studies on skull morphology in cleidocranial dysostosis].

Using computerized tomography (5 patients) and lateral cephalograms (17 patients) for analysing craniofacial pathology in patients with cleidocranial dysostosis, a number of specific morphologic disorders could be demonstrated in great detail. Furthermore, new characteristics of cranial base dysplasia and disproportion of the facial skeleton could be clearly demonstrated. These findings also explain the typical concave profile of these patients.

Adolescent↗

PubMed1991

[Therapeutic approaches for patients with cleidocranial dysostosis].

In three cases of c.c.d. it could be shown, that combined orthodontic and surgical treatment provided further possibilities for the treatment of severe problems in permanent dentitions as well as correcting extreme skeletal discrepancies of the facial skeleton in c.c.d. Well-scheduled removal of supernumerary teeth creates space for the spontaneous eruption of delayed teeth. By the use of carefully applied orthodontic forces, alignment of even extremely displaced teeth is shown to be possible. Furthermore, it is demonstrated that careful planning and realization of osteotomies in the midface can remarkably improve the facial appearance and the relationship of the jaws thus facilitating particularly future prosthodontic treatment.

Adolescent↗

PubMed1991

[Frequency of tooth agenesis in CLP patients with eruption of all four third molars].

Tooth agenesis was investigated in 101 patients with complete unilateral or bilateral cleft lip and palate presenting four third molars. The prevalence was found to be six times higher than in the control group. The most commonly missing teeth were the upper second premolars and the upper lateral incisors. With the exception of one patient, tooth agenesis in the mandible was only found in combination with congenital absence of teeth in the maxilla.

Anodontia↗

PubMed1990

[Follow-up study of the reaction of the marginal and apical periodontium under the continuous application of force].

Radiological findings and clinical data from existing treatment records have been examined using X2-test for clarification of possible relationships between pathological reaction of the periodontal ligament to continuous application of force and different patient-specific and therapeutic factors. It was shown that 70% of the total group have pathological changes following fixed appliance therapy. Apical root resorption usually could be diagnosed five times more frequently than marginal bone loss. No age-specific relationship was noted. The findings confirmed that active intrusion, extensive tooth movement, interruption of treatment, and in particular the anatomical configuration of the roots codetermine the quality of the periodontal reaction.

Adolescent↗

PubMed1990

[The treatment of deep bite in adults].

UNLABELLED: 49 treated adult patients with deep-bite were classified by analysing orthodontic models and lateral cephalograms differentiating skeletal, dento-alveolar deep-bite and class I, class II-1, class II-2 malocclusion. Change of overbite and position of incisors were described within every group and compared with the other groups. RESULTS: On the average overbite decreased about 3.5 mm, mostly however combined with root resorptions in the maxillary front. After removing the appliance overbite relapsed about 1.7 mm at 93.3% of cases. The percentage of factors which made possible a decrease of overbite was described and parameters which caused the relapse were discussed. Interpreting the results of orthodontic treatment in adults, it seems to be legitimized in some exactly indicated cases but, treatment in adults is not the best time for correcting deep-bite.

Adult↗

PubMed1990

[The experiences of adult patients with their orthodontic treatment].

Own experience with an orthodontic treatment stimulated us to interview patients out of retention about four topics concerning their opinion and experience: 1. Reasons for treatment, 2. doubts about treatment, 3. troubles during treatment, 4. attitude to the result of treatment. 50 adults, former patients of the Department of Orthodontics at the Erlangen-Nürnberg University, responded our questionnaire. Aesthetics range first in the patient's desires for treatment. Severe doubts about treatment rarely occurred before treatment. The occurrence of particular complaints cannot be predicted and does not show a characteristic distribution. Pain, induced by treatment generally was underrated. For unpredictable severe pain may occur, one might consider to review the treatment goals critically after the patient's own experience with orthodontic treatment.

Adult↗

PubMed1990

[Craniocarpotarsal dystrophy (Freeman-Sheldon Syndrome)].

In the case of a woman with Freeman-Sheldon syndrome clinical, radiographic and CT data were used to demonstrate specific craniofacial and dental characteristics. Three-dimensional surface reconstruction of the cranial morphology obtained from axial CT scans was found to provide the most useful means for analyzing the characteristic craniofacial deformities in this syndrome. Apart from the dentofacial structures also orthopedic disorders were evaluated clinically and radiographically with particular consideration of the cervical spine morphology.

Adolescent↗

PubMed1990

[Hypodontia with anlage of all four third molars].

Orthopantomographic films and anamnestic data of 1553 orthodontic patients presenting four third molars were evaluated for tooth agenesis. Agenesis was found in 94 patients (6.1%). There were no significant differences between male and female patients. The most commonly missing teeth were the lower second premolars followed by the upper lateral incisors and the upper second premolars in decreasing order of frequency. Compared with the data in the literature, these results suggest that agenesis occurs less frequently in patients with anlage of all four third molars.

Anodontia↗

PubMed1989

[Sequelae of unsecured elastic bands (the status after 7 years)].

The use of elastic bands without an adequate appliance mechanism to close a diastema represents a professional error on behalf of the dentist. Two case reports are presented showing both the consequences of such malpractice and the successful periodontal and orthodontic treatment over a period of seven years. The reasons for this successful treatment are discussed as well as points of special interest.

Child↗

PubMed1989

[3-D reconstruction for assessing the morphology of craniofacial structures].

The diagnostic value of 3-D reconstructions from axial CT scans in evaluating craniofacial structures was analyzed on the basis of a selected orthodontic patient group. The results showed that, for the first time, a three-dimensional analysis of the craniofacial relationships could be obtained which was not a mere spatial evaluation of the morphological structures. The specific application of this imaging procedure in detailed evaluations of complex dysmorphias and asymmetries seems to be justified.

Face↗

PubMed1987