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At least 721 records · Page 40Linked to original sources
PubMed1983

[Pilot study of chronic bronchitis in varnished wire production].

Until now knowledge on hazardous effects of wire-varnishings on the lung is insufficient. 31 wire-varnishers and 33 wire-drawers were studied by questionnaire, physical examination and lung function tests. The varnishers showed significant signs of small airways disease (decreased MEF50 and MEF75). They had symptoms like cough, phlegm and wheezing more often than the drawers. These findings supported the argumentation to acknowledge existing chronic bronchitis as a professional disease in three cases.

Adult↗
PubMed1981

[Tissue reaction with platinum-iridium insulated electrodes (author's transl)].

Pt-Ir-electrodes were coated with different insulations. Some of the insulations proved to be highly cytotoxic. Pt-Ir (9:1) electrodes coated with "PYRE-M.L." were easy to handle and did not show any cytotoxic effects. A change of electric impedance was found when the voltage was raised and platinum had changed the surface of the cathode.

Animals↗
PubMed1980

Effects of neonatal exposure to paint thinner on the development of swimming in rats.

Rats were exposed to paint thinner twice a day for a period of 10 minutes on Days 1 through 30 of postnatal life. The subsequent effects upon physical development, swimming ability and escape latency from water were evaluated. Maturation of swimming behavior and general physical development were delayed about 2-4 days in the experimental animals compared with non-exposed littermate controls. The results of these experiments suggest that exposure to this organic solvent during the early postnatal period interferes with the development of the cortico-subcortical neural structures underlying swimming and locomotion.

Animals↗
PubMed1994

Glass ionomer cement surface protection.

PURPOSE: To evaluate the effectiveness of various surface treatments for glass ionomer cement (GIC) by determining quantity of dye uptake spectrophotometrically. MATERIALS AND METHODS: Sixty specimens, 4.5 mm diameter and 2 mm thick, were made from Shofu GIC and divided into 10 groups. Positive control (A) and negative control (B) specimens were not protected while experimental specimens were protected with ARM chemically-cured bonding resin (C), Durafill Bond light-cured bonding resin (D), Bondlite light-cured bonding resin (E), Colorama nail varnish (F), Shofu varnish (G), Copalite varnish (H), Vaseline (I) or Vaseline followed by Copalite (J). The discs were immersed in 0.05% methylene blue solution 10 minutes after mixing except group B specimens which were immersed in deionized water. After 24 hours the discs were removed, washed, and individually placed in 1 ml 65% nitric acid for 36 hours. The solutions were filtered, centrifuged and the absorbance determined spectrophotometrically at 590 nm. Dye uptake was expressed in microgram dye/restoration and the data analyzed by ANOVA and Tukey Kramer test. RESULTS: The mean (SD) of dye uptake were: A:95.12 (11.28); B:0 (0); C:40.90 (5.06); D:33.89 (3.63); E:35.73 (3.36); F:3.29 (0.79); G:14.87 (2.86); H:21.99 (3.25); I:47.21 (7.06); J:29.74 (3.49). All the surface agents were effective in protecting setting restorative glass ionomer cement, but nail varnish provided the best results.

Analysis of Variance↗
PubMed1993

Varnish application technique and microleakage of amalgam restorations.

Various techniques for applying two types of varnish to control microleakage of Class V amalgam restorations were compared in vitro. The drying time for each layer of varnish with a gentle air spray was varied, including delays in applying the second coat and the placement of the amalgam restoration. Microleakage was recorded by dye penetration. Both varnishes were inefficient at reducing dye penetration at the gingival wall. There were no statistical differences in dye penetration at the gingival wall between the two varnishes, regardless of the method of application, or the presence of varnish. Both varnishes exhibited good sealing properties at the occlusal wall when used according to the manufacturer's instructions, but varnish application was technique-sensitive. Short-cuts in the procedure may increase leakage; too short a drying time of either varnish can cause microleakage similar to the control group without a varnish.

Analysis of Variance↗
PubMed1995

Influence of protecting agents on the solubility of glass ionomers.

PURPOSE: To evaluate the influence of protective agents (varnish and glaze-resin resin) on water solubility of two glass ionomer restorative cements (Chelon-Fil and Vidrion-R), with the graviometrical test (A.D.A Specification No 9). MATERIALS AND METHODS: Fifteen samples of each restorative cement were obtained and divided in one control and two experimental groups: (a) control, no protection; (b) protected with varnish; (c) protected with glaze-resin. On the two experimental groups, after the initial gelification reaction, the specimens were protected and immersed in distilled water for the period of 1 and 24 hours. RESULTS: The two glass ionomer restorative cements tested required surface protection to avoid the early solubility. Among the protective materials evaluated, the varnish was the most effective agent.

Analysis of Variance↗