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Biomedical subjects

W Harzer

Publications and source records attributed to W Harzer.

12 recordsLinked to original sources
PubMed1992

[The long-term observation of alveolar bone blood flow during tooth movement with the aid of skeletal scintigraphy in an animal model].

We observed in eleven dogs the blood flow in the alveolar bone during the tooth movement with the bone scintigraphy for one year. Additional we used for histological evaluation polychrome sequence marking and for improving of therapy electrostimulation. There is a correlation between tooth movement and blood flow. Four to six weeks after beginning tooth movement and blood circulation are reduced although the applied force was continuous all the time. This is an advice for stress interruption during treatment. Electrostimulation improves the conditions for tissue regeneration because the lifetime of osteoblasts is prolonged.

Alkaline Phosphatase↗
PubMed1991

[Findings for validity of Dresden cephalometric (by Hasund)].

Cephalometric analysis is essential in order to evaluate treatment results. 202 patients were investigated for the validity of the norm values according to Hasund. In order to test the validity of the growth prediction methods of Björk and Petrovic 23 class II div. 1 and 21 class III patients were analysed before and after treatment and the treatment results achieved compared with the growth prediction values. The results of the norm value tests showed that the population in Saxonia is more retrognath than that in the northern region of Germany (Hasund norm group). The study also showed that the Björk growth prediction and the Petrovic growth categories were not specific enough and it is therefore suggested that separate growth prediction methods should be used in class II div. 1 and class III groups.

Adolescent↗
PubMed1991

[Teleroentgenographic findings in adults with overbite. Teleroentgenographic morphology in closed-bite patients].

Lateral skull radiographs were analyzed in twenty patients with retroclined incisors. Greatest deviations from the comparison values were found in the region of the lower face. The mandible shows a retrognathic and counter clockwise rotated position. The height of the anterior lower face height and the dentoalveolar height are reduced. The interincisor angle ist distinct increased. Etiological aspects and the therapeutical consequences of the findings are mentioned.

Adult↗
PubMed1991

[Computer-assisted teleradiographic image interpretation in orthodontics].

The utilization of a computer supported cephalometric system using the analysis introduced by Hasund is demonstrated. In comparison to the traditional measurement by hand the advantages of a computerized analysis are: Time reduction, minimization of evaluation errors, the use of individualized norm values and the advantages in recording.

Cephalometry↗
PubMed1990

[The dentition and jaw growth of 60 mono- and dizygotic twins between the ages of 10 and 18].

60 twins were investigated between the age of ten and 18 years to obtain information about inheritance of tooth-crown size and growth of alveolar bone. The results suggest genetically controlled interaction between tooth germs during their formation. The intrapair differences decrease between ten and 18 years for the alveolar bone diameters. This is an advise for stronger genetically influences in higher age and an etiological factor for relapse after orthodontic treatment.

Adolescent↗
PubMed1990

Limiting factors of functional adaptation to orthodontic space closure.

The closure of spaces, especially in the incisor region, has been criticized as causing functional alterations in the masticatory system. The study comprised 80 patients, 30 with space closure and 50 as a control. The results showed that closure of incisor spaces caused marked occlusal alterations, but apparently no damage to the temporo-mandibular joint nor to muscle action, provided that treatment was completed before the age of 12 years.

Anodontia↗
PubMed1989

[The open bite--morphology and therapeutic consequences].

With cephalometric measurements we investigated the morphology of the malocclusion "Open bite" from adults. The main of abnormality is the divergence of the jaw bases and the compensatory growth of alveolar bone in vertical direction. Under consideration of the best time for beginning of the treatment we give advice for the etiologically orientated therapy.

Adult↗
PubMed1979

[Experimental studies on the use of direct bonding in dental orthopedics (author's transl)].

Plastic filling materials of the Noracryl 100 and Evicrol type were used on twenty extracted teeth as adhesives for direct bonding. The two plastic materials did not differ in fatigue and tear-off test results.--The values of tensile strength were many times those of therapeutically effective orthodontic forces. Using replicas and scanning electron micrographs of the enamel surface, it was possible to show that, after bracket removal and polishing, residues of Noracryl are more easily removable than those of Evicrol.--Initial clinical tests allowed these results to be verified.

Acid Etching, Dental↗
PubMed1978

[The collection and evaluation of sulcus fluid in the juvenile periodontium].

On the collection and the evaluation of the crevicular fluid from the child's periodontium. In a methodological study on the collection of crevicular fluid, we used in 50 children with clinically healthy gingivae a method for the collection of crevicular fluid that we had modified. Small amounts of fluid could be collected in all instances, also during different periods of eruption, in the regions of deciduous and permanent anterior teeth, and in the molar region. It is planned to employ this method (after further improvements) in investigating the possible effects of changes in the crevicular fluid composition on the developmental and regenerative processes in the juvenile periodontium.

Gingival Crevicular Fluid↗
PubMed1978

[Contribution to familial ectodermal dysplasia].

The frequent occurrence of the clinical picture of ectodermal dysplasia in the family P. is described. The differences between subjects in symptomatology are discussed in detail. The author's experience speaks well for a great variability of the hereditary mode of this disease. Furthermore, advice is given on the detection and regular ambulatory supervision by the stomatologist.

Anodontia↗