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Biomedical subjects

P Hotz

Publications and source records attributed to P Hotz.

At least 91 records · Page 5Linked to original sources
PubMed1980

Study of some hepatic effects (induction and toxicity) caused by occupational exposure to styrene in the polyester industry.

This study describes an occupational health survey carried out in the polyester industry in order to investigate the hepatic effects caused by exposure to styrene. Fifty-seven workers underwent a medical examination. They were submitted to blood and urine sampling for the determination of the degree of exposure, by the analysis of urinary mandelic and phenylglyoxylic acids (styrene metabolites), and the intensity of induction and/or hepatic effects, by the analysis of urinary glucaric acid and plasma enzyme activities (gamma glutamyl transferase, ornithine carbamoyl transferase, alanine aminotransferase, and aspartate aminotransferase). The results showed that styrene does not give rise to measurable autoinduction. With regard to the hepatic tests, exposure to styrene caused an increase in the plasma enzyme activities, a phenomenon illustrating a possible damaging effect on liver cells. This effect appears with exposure below 100 ppm (time-weighted average).

Adult↗
PubMed1979

[Inspection of 1 to 5-year-old amalgam, composite, and cast gold fillings].

On 103 randomly chosen patients composite-, amalgam-, and cast gold fillings were checked and examined after various criteria. Also, the gingival changes were noted and vitality tests made. As was to be expected, composites, particularly class 2-fillings, showed more loss of substance than amalgams. The latter, however, had a worsening marginal adaptation with increasing age. Secondary caries was generally more frequent in subgingival fillings. The quality of the material was of smaller importance than the marginal leakage. Inflammatory processes of the gingiva were more frequent with composites than with inlays. Gradually increasing discolorations were the rule. Very few teeth lost their vitality after treatment, irrespective of the bases (normal, direct and indirect capping).

Adult↗
PubMed1978

[Fissure sealing combined with enamel fluoridation. Follow-up study 2 year after sealing].

In a two-year study the adhesion of diluted composite material as fissure sealant was tested upon etched and etched-fluoridated (aminofluoride) occlusal surfaces of molars and premolars. After 24 months the sealant was found to be intact in 89.3% of the only etched and in 85.6% of the etched-fluoridated fissures. 3.9% of all sealed fissures showed either an increase in the degree of caries or a filling, while the control teeth showed a percentage of 49.7 DF. Fissure sealing therefore appears to be an adequate method for reducing occlusal caries.

Adolescent↗
PubMed1977

[Caries diagnosis of deciduous teeth, value of radiography].

Deciduous molars of 10-11 year-old children were examined clinically and radiologically for caries. The findings were compared. Without the radiological evidence of the bitewing pictures about 66% of proximal caries of deciduous molars would have been overlooked. Moreover, the lesions could be detected earlier.

Child↗
PubMed1975

[The effect of fluorides on the adhesion of sealants on etched enamel].

The adhesion of composite filling material was examined on etched and fluoridated enamel in vitro. Etching considerably improves the adhesion. Application of 1% NaF and of 1% acid phosphate fluoride after etching insignificantly decreases it. 1.15% aminofluoride does not change the adhesion.

Composite Resins↗