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This study aims to maximize the function of base plate in dental orthodontic appliance by comparing fracture strength of base plates manufactured with spray-on technique and doughing technique. S₁-group(spray-on technique) and D₁-group(doughing technique) were manufactured in tap water at room temperature under the pressure of 1㎏/㎠. S₂-group and D₂-group were manufactured in 20℃ distilled water under the pressure of 2㎏/㎠. S₃-group and D₃-group were manufactured in 20℃ distilled water under the pressure of 4㎏/㎠. S₄-group and D₄-group were manufactured in 40℃ distilled water under the pressure of 2㎏/㎠. S_(5)-group and D_(5)-group were manufactured in 40℃distilled water under the pressure of 4㎏/㎠. In each group 5 sample plates of each group were prepared with the size of 25×2×2㎜. so total 50 sample plates were manufactured using self-curing resin. After sample plates were immersed in distilled water(37±1℃) for one day. the fracture strength of each was measured with 3 point flexural equipment of Instron. The results are as follows: 1. When sample plates were manufactured in tap water at room temperature under the pressure of 1㎏/㎠. the fracture strength was low regardless of the resin work technique. 2. When sample plates were manufactured in 20℃ distilled water under the pressure of 2㎏/㎠, sample plates manufactured with doughing technique(D₂) showed significantly higher fracture strength(p<.05) than those with spray-on technique(S₂). When sample plates were manufactured with spray-on technique in 20℃ distilled water, sample plates manufactured under the pressure of 4㎏/㎠(S₃) showed significantly higher fracture strength(p<.05) than those under the pressure of 2㎏/㎠(S₂). 3. When sample plates were manufactured in 40℃ distilled water, sample plates manufactured with doughing technique showed higher fracture strength than those with spray-on technique. But, there were no significant differences in fracture strength between the resin work technique or between the pressure. With these results. the fracture strength of sample plates will be higher when the temperature of distilled water and the pressure increased, and when sample plates were manufactured with doughing technique rather than with spray-on technique.
To observe the activity of the xanthine oxidase in cerebral ischemia, an ischemic model was made using a transorbital occlusion of the middle cerebral artery(MCA) in cats. Xanthine oxidase activity was measured by means of high performance liquid chromatography with electrochemical detection of uric acid. The results were as follows : 1) The infarction in the territory of the left middle cerebral artery(MCA) was identified with intracardiac perfusion of a 2% triphenyltetrazolium chloride(TTC) solution after transorbital occusion. 2) There was no significant difference between the control and ischemia groups in the total xanthine oxidase activity. 3) In the control group, 38.2% of the total xanthine oxidase was in the oxygen-dependent superoxide-producing oxidase group (Type 0). It had been increased with time in ischemia, despite the total xanthine oxidase activity remaining the same ; particularly at 12 hours (p<0.05) and 24 hours (p<0.01) after occlusion of the left MCA. 4) In the healthy side, the activity of type 0 and its ratio to the total xanthine oxidase activity has not been increased. 5) IN the ischemic side, the conversion of type D xanthine oxidase to the type 0 xanthine oxidase was demonstrated and its rate had been increased with the passage of time.
The study objected to the 64 persons out of 102 persons who had registered under the association of the dental technicians in Kang-Won to grasp contents about improvement of life long education of the present day of January 2000, and its results which we had acquired by this study were as follows ? l. A sense of satisfaction toward the system of life long education appeared as unsatisfaction and its unsatisfaction decreased from the contents of education, The rate of member's attendance, the problem of inviting of a lecturer. 2. The frequency of the opening for the life long education was fixed as nowadays two times per annually and they wanted to keep it. They liked the opening at the second week and preferred the holding on saturdays. 3. The subject of the life long education had appeared the opinion that thesis was lop-sided toward the allocation of time schedule of lecture appeared the opinion of which they preferred the rate of an hour of cultural subject and three hours of major studies, and invitation for an instructor they preferred two dentist, one member, one dean for the cultural subject and there were lots of opinions which they wished display of materials. 4. A sense of satisfaction about the place was good. They hoped taking place in a public auditorium or seminar room. 5. The problem of a Exam. mark, Which derived by a substitute presence and the relation which legal treatment when ones didn't completed Exam. 6. Lastly, there were lot's of opinions who had required the necessities to constitution for the academic branch.
We report on the fabrication and characterization of an oxide photoanode with a zinc oxide (ZnO) nanorod array embedded in cuprous oxide (Cu2O) thin film, namely a ZnO/Cu2O oxide p-n heterostructure photoanode, for enhanced efficiency of visible light driven photoelectrochemical (PEC) water splitting. A vertically oriented n-type ZnO nanorod array is first prepared on an indium-tin-oxide-coated glass substrate via a seed-mediated hydrothermal synthesis method and then a p-type Cu2O thin film is directly electrodeposited onto the vertically oriented ZnO nanorod array to form an oxide p-n heterostructure. The introduction of Cu2O layer produces a noticeable enhancement in the visible light absorption. From the observed PEC current density versus voltage (J-V) behavior under visible light illumination, the photoconversion efficiency of this ZnO/Cu2O p-n heterostructure photoanode is found to reach 0.39 %, which is seven times that of a pristine ZnO nanorod photoanode. In particular, a significant PEC performance is observed even at an applied bias of 0 V vs Hg/Hg2Cl2, which makes the device self-powered. The observed improvement in the PEC performance is attributed to some synergistic effect of the pn bilayer heterostructure on the formation of a built-in potential including the light absorption and separation processes of photoinduced charge carriers, which provides a new avenue for preparing efficient photoanodes for PEC water splitting.
Topographic electroencephalographic study (CME) is a newly developed method using a microcomputer system that displays the scalp topograph as the square roots of the average power spectra over each EEG frequency band on a color television screen. CME were applied to thirty patients. Fifteen patients out of them with focal neurologic deficit were analysed about CT scan and conventional EEG. The results of the study were as follows: 1) Comparing the results of CME and conventional EEG reading, CME revealed to be slightly more sensitive in detecting asymmetrical depression of background activity than the conventional reading of the EEG. 2) Topograph EEG study was more accurate than conventional EEG in lateralization of the lesion. 3) CME is very useful in topographic and objective diagnosis of functional lesion, although the source of the data is the same as that from the conventional EEG.
The Juvenile pilocytic astrocytoma has histologically the same features as the adult type one. Contrary to the adult type, the parallel arrangement of fibrils in long thin tapering cells of the tumor is peculiarly independent of the environment in which the tumor is growing and it gives rise to the main tumor mass that is usually well circumscribed. The overall incidence is relatively rare of all the brain tumor, it occurs in children mainly from three to five of age. Its predilection sites are the hypothalamus and the optic chiasm. We are reporting an experiance of a juvenile pilocytic astrocytoma in a three years old female patient, involving the hypothalamus, basal ganglia and deep white matter of the temporoparietal lobe of the left side.
Intracranial arachnoid cysts are uncommon congenital lesions of considerable interest and importance, the origins and exact nature of which remain uncertain. They account for about 1% of all intracranial space-occupying lesions). Its predilection sites are in the sylvian fissure, the interhemispheral fissure, the cerebral convexity, the base of the brain, and over the midline of the cerebellum in the posterior fossa. We are reporting a case of arachnoid cyst, developed in the left sylvian fissure in a ten years old male patient
This study was designed to investigate the relationship of health promoting daily life style and self-efficiency about a dental technician. For maintaining health, it is important to keep one s healthful behavior. If human activity is decided by personal recognition, it might be crucial to research the relationship between health promotion behavior and the recognition factors on health promotion. A self-efficiency, among cognitive-perceptual factors, has been convinced of being the most efficient factor for a health promotion to take and maintain a certain activity. The purpose of this study is to inquire into the degree of health promotion activity of a dental technician, and to find out the relationship between the self-efficiency and the health promotion behavior in order to offer the basic data for developing a educational method or program of health promotion. The objects of this study were selected by haphazard sampling and the size was 203 of the dental technician. I collected the data 24 November 2000 to 8 January 2001 and the data was analyzed by means, percentage, ANOVA, pearson's correlation coefficient and stopwise multiple regression, using SPSS-PC+, and the results are as follows. 1. The hypothesis that 'The higher the self-efficacy, the better the health-promoting behaviors' was supported on a meaningful level(r=.623, p<.000). I analyzed the effect of self-efficacy on each section of the health-promoting behaviors and the result in every section supported the hypothesis on a meaningful level-the eating habit(r=.541. p<.000), drinking · smoking(r=.629, p<.000), health responsibility(r=.02, v<.000). the control of interpersonal relation(r=.415. p<.000). the exercise(r=.504, p<.000), the control of interpersonal relation(r=.313, p<.000), self-achievement(r=.542, p<.000). 2. The executive degree of health-promoting behaviors of the objects was above-middle, 2.59(total=4.00). When the means of the executive degree of each sections were examined, the section of self-achievement was the highest(2.98), and the others order was drinking smoking(2.81), the control of personal relation(2.80), the control of stress(2.68), the eating habit(2.82), the exercise(2.49), health-responsibility(2.07). 3. The point of self-efficacy was 6.63(total=10.00). In each sections, self-achievement was the highest(7.82). the control of interpersonal relation(7.33), drinking smoking (6.92) was the next, and the control of stress(6.90) was the next, the eating habit(6.26), the exercise(6.05), health-responsibility(5.98) was the lowest one.