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Biomedical subjects

H G Sergl

Publications and source records attributed to H G Sergl.

At least 37 records · Page 2Linked to original sources
PubMed1992

On the prediction of dentist-evaluated patient compliance in orthodontics.

The aim of the present study was to determine to what degree social and psychological patient variables can predict orthodontic co-operation evaluated by dentists 3 and 6 months after the beginning of treatment. The subjects were 94 patients from seven orthodontic practices. They received a questionnaire with four subscales: impulsiveness, dominance, anxiety, and orthodontic attitudes. Compliance was assessed by an 11-item instrument based on the studies of Slakter et al. (1980). None of the social indices could predict co-operation, but the psychological scales for orthodontic attitudes, impulsiveness and dominance showed a significant relationship to later co-operation. The combination of all psychological variables (regression equation) could explain co-operation 3 months later to 12.1 per cent and to 16.8 per cent 6 months later. The implications for psychological guidance in orthodontics and future research are discussed.

Adolescent↗
PubMed1992

Morphological cephalometric differences between two European populations.

Earlier research in craniofacial morphology of the inhabitants of Mainz (Germany) and Zagreb (Croatia), who represent the populations of wider areas, have shown some roentgen-cephalometric differences. The aim of this study is to determine the craniofacial morphologic differences of these populations in three dimensions. The sample consists of 200 adult examinees, male and female respectively, inhabiting the mentioned areas. The sample has been chosen so that the examinees with prominent craniofacial anomalies have been excluded. Twenty three craniofacial parameters with the usual anthropometric instruments have been measured. The data have been processed by using elementary descriptive statistics and discriminant analysis. The results have shown that in Mainz examinees longer and narrower heads and higher faces in comparison with Zagreb examinees, predominate. Significant differences in forehead widths and bipupilar distances have been found.

Adolescent↗
PubMed1992

Disfigurement and psychosocial handicap of adults with extreme mandibular prognathism.

Questionnaires and psychological tests were used to assess the psychosocial impact of mandibular prognathism. Patients with mandibular prognathism were asked to assess the impediments caused by their dentofacial deformity. In addition, they were asked to rate their appearance and to report the effect that it had on their social contacts. The self-assessment revealed that patients felt esthetically impaired, but that they had a fairly positive autostereotype, as revealed by their self-descriptive choices on a personality scale. These results were compared with the assessments made by two different control groups composed of persons with no esthetic impairment. The attitudes of the control groups toward the patients were more negative than perceived by the patients, indicating that mandibular prognathism does result in a social handicap.

Adolescent↗
PubMed1991

[The morphological results of the use of a pulsed krypton fluoride excimer laser for enamel conditioning].

Although there have been many advances in the field of acid etching, major problems still present. For the most part, these are the unpredictability of the effects of etching, the lack of control of the depth of etching over the long term, and the development of enamel fractures occurring on debonding. The aim of this study was to investigate the morphological effects of enamel conditioning using a pulsed krypton fluoride excimer laser (wavelength 248 nm). Scanning electron microscopic examination revealed a surface similar to that produced by peripheral etching; no signs of thermal damage were to be seen. The requirements that have to be met by a modern laser considered as a possible alternative to conventional acid etching, are discussed.

Acid Etching, Dental↗
PubMed1991

[Comparative study of the accuracy of localizing cephalometric reference points in using digital and conventional imaging technique].

The purpose of this study was to present possible advantages of digital luminescence radiography for cephalometry. Conventional and digitalized lateral headfilms were compared and evaluated. The first impression of an improved simultaneous presentation of bony structures and soft tissue profile in digital x-rays was statistically verified. A significant difference in identification of several reference points was proven by means of the F-test. The superior results of the digital luminescence radiography were evaluated in comparison with xeroradiography and experimental postdigitalization of conventional x-rays.

Cephalometry↗
PubMed1991

[Perceptibility of details in conventional and digital teleradiography--a comparative study].

By introduction of rare earth film-screen combinations instead of classical screens dose reduction has already been possible. By this study the extent of dose reduction without loss of clinical information was to be examined by comparing conventional radiographic rare earth film-screen combinations to digital radiography. Statistical analysis proves for conventional lateral cephalograms that soft tissue reference points can better be localized if small radiation doses are used. The localization of reference points in areas of less radiographic transparency is better when applying higher doses. These results were not found in images by digital radiographic technique. Reference points both of soft tissue and of more dense areas of the skull were equally to be localized independent from radiation dose by the linear sensibility characteristics of digital radiography. This enables reduction of radiation doses and therefore a contribution to radioprotection.

Cephalometry↗
PubMed1990

[The relationship between different indicators of growth types].

In this study eleven variables were measured. These could be considered as indicators of the growth type or related to growth type. Together with a calculated combination measurement these variables have been correlated with one another. The correlations were interpreted and related to the type of growth.

Adult↗
PubMed1990

[How well can the growth type be evaluated?].

The purpose of this study was to determine to what extent growth type can be predicted using different information. Correlations between estimated values and those measuring cephalometric growth indicators revealed that the growth type can be evaluated reasonably well by merely viewing the cephalogram. The viewer is guided by form which is represented by the Go2 angle according to Jarabak. Growth type can also be evaluated from a profile photography. The assessment can be improved if one uses a wooden spatula to determine the mandibular and occlusal planes.

Adolescent↗
PubMed1990

[A comparative study of the craniofacial morphology of 2 ethnic groups].

The samples consisting of 200 latero-lateral cephalometric X-rays of examinees with nearly normal occlusion from Mainz are compared with homologous one from Zagreb. The purpose of the investigation was to point out the morphological differences in cranio-facial system. 19 variables were analysed by using essential statistic parameters and discriminative analysis. The results show the differences in the anterior face height, the lower border mandible inclination, the interincisal angle as well as the degree of face convexity. The average examinee from Zagreb, in comparison with the same one from Mainz, shows smaller anterior face height, the marked mandibular basal line inclination in the sense of the anterior rotation, the higher interincisal angle as well as smaller facial convexity.

Adolescent↗
PubMed1989

[The idealisator--a functional end appliance made of a pliable plastic].

A new appliance, the idealisator is presented. Its form has been derived from the original activator, but is made from soft acrylic following a set-up whereby the teeth are arranged in an ideal occlusion. This appliance could be an alternative to the Kesling positioner. By comparison it seems to have some advantages.

Activator Appliances↗