Symptomatic spinal epidural gas-containing cystic lesion is a rare clinical disease entity. We recently experienced two cases of symptomatic epidural gas-containing cysts that were the main cause of the patients?radiculopathy and the cysts were removed surgically. These lesions were actually gas containing ruptured disc herniations from the vacuum discs at the same level. We report herein on the radiological findings along with conducting a review of the related literature.
Spine ; Vacuum

In order In interpret the relationship among many variables, urinary mercury and at the same time mercury concentration in air were measured for 254 workers of a fluorescent lamp manufacturing factory. And monthly mercury consumption amounts, numbers of monthly producing fluorescent lamps, numbers of inferior lamps and numbers of breakage lamps, numbers of vacuum exhaustion pumps and frequencies of mercury infusion were also investigated from January 1988 to March in 1989. The results were as follows; 1. On the mercury concentration in air by producing line and by working site, all of them were exceed the threshold limit value (0.05mg/m(2)). 2. The highest mercury concentration in air by sampling point was found at the floor of workplace (0.334mg/m(2)) and next were at vacuum exhaustion pimp (0.183mg/m(2)), and breathing zone of workers (0.103mg/m(2)) in order. 3. The highest mean of the mercury concentration in urine by producing line was the automatic exhausting line (80.8microgram/1) and next were high speed exhausting line (72.4microgram/1), and Manual exhausting line (35.8microgram/1) in order. Distribution of workers of the mercury concentration in urine more than 200microgram/1 by working site was the highest (10%) in the vacuum exhaustion pump part and next were sealing part (6.6%), packing part (4.6%), and stem part (4.1%) in order. 4. The correlation coefficient between mercury concentration in urine and in air was the highest (0.302) and next were numbers of breakage lamps (0.223), frequencies of mercury infusion (0.223), numbers of inferior lamps (0.205) in order.
Respiration ; Vacuum

This research was conducted to investigate the correlations between urinary mercury concentration and each independent variable related with urinary mercury levels. the urinary mercury concentrations of 543 workers exposed to metal mercury vapor in a total of 11 fluorescent lamp manufacturing factories and at the same time mercury concentrations in air were measured from June 1989 to December 1989. And annually mercury consumption per workers, mercury consumption per lamp, numbers of breakage lamps, frequency of mercury infusion, numbers of droppers, and numbers of vacuum exhaustion pumps were also investigated. The results were as follows: 1. The geometric mean of airborne mercury concentration in a total of 11 factories was 47.9 microgram/m3 (5.8~352.2 microgram/m3), six factories(54.5%) of them were exceed the threshold limit value(50.0 microgram/m3). 2. The geometric mean of urinary mercury concentration among 543 workers was 84.3 microgram/l (1.13~533.9 microgram/l), the distribution of workers by urinary mercury concentration showed that 26 workers(4.8%) were above the mercury posioning level(300 microgram/l). 3. The correlation coefficient between urinary mercury concentration and monthly numbers of breakage lamps was the highest(0.74) and next was mercury consumption per lamp (0.67), annually mercury consumption per worker(0.63) in order.
Korea* ; Vacuum

No abstract available.
Intervertebral Disc* ; Vacuum*

No abstract available.
Intervertebral Disc* ; Vacuum*

No abstract available.
Capillaries* ; DNA* ; Vacuum*

No abstract available.
Humans ; Infant, Newborn ; Vacuum

No abstract available.
Skin ; Transplants ; Vacuum

STATEMENT OF PROBLEM: Shade selection has traditionally been accomplished by visual examination, which is particularly relevant to the shade selection of anterior teeth, but the subjective nature of visual analysis can lead to errors in shade matching. Recently shade selection systems have been developed to provide a more objective and scientific approach to understanding and clarifying shade selection. PURPOSE: The purpose of this study was analysis of various shade analyzing equipment with the goal of providing a more objective shade selection. Materials and method: Visual shade matching system selection(Vita Lumin Vacuum shade guide, Vitapan 3D Master shade guide) and mechanical shade matching method(ShadeEye (R) -EX Chroma Meter, ShadeScan(TM) System) used for this study. The shade guide tap specimens for 10 extracted maxillary anterior teeth were produced by selecting shades using each shade matching system. The accuracy of the selection of shades for the teeth and fabricated specimens were evaluated by analyzing the calculated shade difference(delta E*), using a spectrophotometer and calculating the output of value L*, a*, b*. RESULTS AND CONCLUSION: The results show that the average delta E* value (difference of shade) of the shade tap specimens to the actual specimen decreased in the following order: Vita Lumin Vacuum Shade Guide(VL), ShadeEye(R)-EX Chroma Meter(SE), Vitapan 3D Master Shade guide(V3), and ShadeScan(TM) System(SS); and that there are significant statistical differences between the VL and SS (p<0.05). In the analysis of the delta E* (difference of shade) value, 40% of the VL group was found to be less than 3.3 (limit value of shade tap specimens clinically acceptable), 60% in the V3 group, 50% in the SE group, and 80% in the SS group.
Dental Porcelain* ; Spectrophotometry* ; Tooth ; Vacuum

This study evaluated the effect of dagassing on the ceramic bond strength of two Ni-Cr alloys under varying holding time at the upper limit temperature and atmospheric conditions. Metal specimens were divided into 5 groups for each alloy according to degassing conditions prior to porcelain application : no degassing, degassing under vacuum without hold, degassing under vacuum with hold for 5min. and 10 min. respectively at the upper limit temperature and degassing in air. Total number of metal ceramic specimens was eighty and each group had eight specimens : The ceramic bond strength was measured by four-point flexural test using Instron and the fractured surface was examined under SEM. The results obtained were as follows. 1. Degassing in air improved the ceramic bond strength of Ni-Cr alloys. 2. in degassing under vacuum, hold at the upper limit temperature was advantageous to the ceramic bonding of Ni-Cr alloys. 3. After ceramic metal bond test, metal surfaces were partially covered with the thin porcelain layer, and the cohesive failures in porcelain were predominant in groups showing higher ceramic bond strength.
Alloys* ; Ceramics* ; Dental Porcelain ; Vacuum