• The Journal of Korean Academy of Prosthodontics
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• v.35 no.1
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• pp.31-42
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• 1997

This study was performed to investigate the surface roughness of the Cerec Vita Mark II polished by various polishing techniques, compare with that of the Vintage enamel porcelain glazed by high temperature glazing technique. All of the Cerec specimen were finished with sequential use of high speed diamond burs(grit 45, 30 and $15{\mu}m$). The groups were divided into 5 groups : Group I : Cerec Vita Mark II block specimens polished with Sof-lex discs. Group II : Cerce Vita Mark II block specimens polished with Two Striper MPS. Group III : Cerce Vita Mark II block specimens polished with Enhance. Group IV : Cerce Vita Mark II block specimens polished with Porcelain laminate polishing FG kit. Group V : Vintage enamel porcelain glazed by high temperature glazing Technique. Each group was consisted of 10 specimens. The surfaces produced were examined quantitatively using a laser specular reflectance machine(Perthen RM600-s, Feinpruf Perthen GmbH., Germany) and qualitatively under SEM(JSM-5400, JEOL, Japan). The Results were as follows : 1. The arithmetic mean roughness value(Ra) in groups 1, 2, 3 and 4 was higher than that of group5. There was statistically significant difference(P<0.05). 2. The arithmetic mean roughness value(Ra) decreased in the following orders : group 1, group 2, group 4, group 3 and there was no statistically significant difference between group 1 and group 2, group 3, and group 4. There was statistically significant difference among group 1, 2, and group 3, 4 and group 5(P<0.05). 3. The maximum individual peak-to-valley-height(Rmax) decreased in the following orders : group 2, group 1, group 4, group 3, group 5 and there was no statistically significant difference between group 1 and 2, group 1 and group 4, group 3 and group 5. There was statistically significant difference among group 1, 2, and group 1, 4 and group 3, 5(P<0.05). 4. The treated surfaces of group 5 had smoother surface than that of groups 1, 2, 3, 4 with SEM.

• Journal of Technologic Dentistry
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• v.10 no.1
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• pp.55-66
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• 1988

The great sudden change of circle of dental laboratory technology brought many discord between the new growing environmental group and the old group. In order to know the satisfactory degree of Dental Laboratory Heads about all and woman dental technicians who graduated from junior college, this study was conducted for 41 dental laboratory heads in Pusan area during Aug. to Sep. 1986 by means of a questionaire. The results are obtained as follows : 1. By born place, the dental laboratory heads’ satisfactory degree mean of items about all dental technician who graduated from junior college were Pusan group 3.55, Kyungnam group 2.94. The difference among the groups was significant enough(P<0.05). The satisfactory degree about woman dental technician graduated from junior college were Pusan group 3.45, Kyungnam group 2.72. 2. By age, The degree of satisfaction of items about all graduate dental technician were 30$\sim$34 age group 3.13, 40$\sim$44 age group 2.71. The degree of satisfaction about woman graduate dental technician were 30$\sim$34 age group 3.13, 40$\sim$44 age group 2.71. The degree of satisfaction about woman graduate dental technician were as follow : 35$\sim$39 age group 3.50, 45$\sim$49 age group 3.16, 30$\sim$34 age group 2.86, 40$\sim$44 age group 2.43. 3. By job career, the highest degree item out of satisfaction about all graduate dental technician was 6$\sim$10 years group 3.58, the other items were 1$\sim$15 years group 2.90, 16$\sim$20 years group 2.71. The satisfactory degree item about woman graduate dental technician was 6$\sim$10 years group 3.43, 16$\sim$20 years group 3.15, 11$\sim$15 years group 2.82 respectively. 4. By managing term of respondents’ dental laboratory, the satisfactory degree of items about all graduate dental technician were below 2 years group 3.25, 3$\sim$6 years group 3.14, 7$\sim$10 years group 2.93 in order. The satisfactory degree items about woman graduate dental technician were 11$\sim$14 years group 3.25, 3$\sim$6 years group 3.14 7$\sim$10 years group 2.80 in order. 5. By acquired qualification of licence test, the satisfactory degree of dental laboratory heads about all graduate dental technician were job career group 3.07, graduated from Dept. of Dental Technology group 3.00. The satisfactory degree about woman graduate dental technician were job career group 3.03 and graduated from Dept. of Dental Technology group 2.57. 6. By dental technician numbers of respondents’ dental laboratory. the satisfactory degree of items was as follow: 10$\sim$13 persons group is 2.86, 6$\sim$9 persons group 3.25, below 5 persons group 3.11. There was significant enough.(P<0.01). The satisfactory degree items about woman graduate dental technician were below 5 persons group is 3.00, 10$\sim$13 persons group 2.79, 6$\sim$9 persons group 2.67. 7. by the outlook of occupation, the satisfactory degree of dental laboratory heads about all dental technicians who graduated from junior college were neither good norbad group 3.20 bad group 2.59, good group 3.13. The difference among the groups was significant enough(P<0.01). The satisfactory degree about woman dental technicains graduated from junior college were good group 3.25, neither good nor bad group 2.80, bad group 2.75. The difference among the groups was significant enough.(P<0.01) 8. By occupational satisfaction, The satisfactory degree of items about all graduate dental technician were neither satisfied nor dissatisfied group 3.08, satisfied group 3.17, dissatisfied group 2.89. The satisfactional degree of items about woman graduate dental technician were satisfied group and neither satisfied mor dissatisfied group each 3.00 9. By the outlook of employment, the satisfactory degree of items about all graduate dental techician were bad group and neither good nor bad group 3.00. There was significant enough.(p<0.02) About woman graduate dental technician were good group 3.80, neither good nor bad group 3.00, bad group 2.84. The difference among the groups was significant enough.(P<0.01) 10. By cognition of the number of graduate dental technician, the satisfactory degree of dental laboratory heads about all graduate dantal technician were too many group 2.86, many group 3.32. There was significant enough.(P<0.05) About woman graduate dental techician were too many group 2.60, many group 3.20 The difference among the groups was significant enough.(P<0.01) 11. As compared with the items ut of satisfaction and improvement about all dental technician who graduated from junior college, the rate of satisfaction item was for as follow : dental technological theory is 5.21%, ability of adaptation and sincerity each 17.1%. The rate of improvement items was as follow : sincerity is 39%, ability of work and ability of basical work each 24.4%. 12. As compared with the items out of satisfaction and improvement about woman dental laboratory technician who graduated from junior college, the rate of satisfaction item was as follow : atmosphere of the office is 56.1%, sincerity 22%. The rate of improvement items was as follow : ability of adaptation is 36.6%, ability of work 31.7%.

• Clinical and Experimental Reproductive Medicine
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• v.16 no.2
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• pp.211-220
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• 1989

The aim of this study was to compare the response and their outcome of superovulation induction protocol in IVF-ET program. One hundued seventy seven infertile women were stimulated by FSH/hMG(group I, N=128), clomiphene citrate/hMG(group II, N=51), and hMG(group III, N=18) for the purpose of ovulation induction. The results were as follows; 1. The mean ages of patients were $31.9{\pm}3.8$ in group I, $30.6{\pm}3.3$ in group II, and $29.3{\pm}2.5$ in group III. 2. The day of hCG administration was $11.1{\pm}1.8$ in group I, $12.1{\pm}2.0$ in group II, and $13.7{\pm}6.8$ in group III. The hCG administration day of group III was significantly delayed compared with that of group I (p<0.001). 3. The terminal E2 pattern in group II was different from those of group I and III, but there was no significant difference. 4. The mean numbers of mature eggs aspirated were $5.5{\pm}3.8$ in group I, $5.0{\pm}3.3$ in group II, and $5.6{\pm}5.4$ in group III. There was no significant differences in the mean numbers of mature eggs retrieved among the three groups. 5. The fertilization rate of eggs was significantly higher in group II (67.9%) than that of group I (52.2%)(p<0.001). 6. The cleavage rate of group I (67.0%) was significantly lower than those of group II (93.2%) and group III (95.8%) (p<0.0001). 7. The mean numbers of embryos transfered were $3.3{\pm}1.4$ in group I, $3.1{\pm}1.3$ in group II, and $3.2{\pm}1.6$ in group III and the ET rate was 69.0% in group I, 77.3% in group II, and 100% in group III. There was significant difference in ET rate between group I and group III (p<0.005). 8. The pregnancy rates per OPU cycle or ET cycle were not significantly different among the three groups, but delivered and ongoing pregnancy rates were significantly different between group I (36.8%) and group II (p<88.8%) (p<0.05).

• The Journal of Korean Medicine
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• v.16 no.1 s.29
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• pp.379-402
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• 1995

This study was performed to investigate the comparative effects of Apitoxin(0.1% bee venom 0.1cc) & Acupuncture therapy on the knee joint arthritis induced by 0.1% carrageenin solution at Rt. knee joint in rats. After carrageenin injection, the apitoxin was injected for two times (Experimental group I : 1 & 24hours later, Experimental group II : 48 & 72hours later) into the corresponding loci to Rt. $ST_{35}$(Group 3) & $EX-LE_4$(group 4) of the human body in rats. Acupuncture therapy was done same as above. And then the comparative effects of apitoxin and acupuncture therapy on the knee joint arthritis were estimated by the WBC count, RBC count, hemoglobin level, hematocrit level and ASO titer in serum. The results were summerized as follows : 1. The effects of apitoxin & acupuncture on WBC count showed remarkable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 2. The effect of apitoxin on RBC count showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. The acupuncture was not showed decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 3. The effects of apitoxin & acupuncture on hemoglobin level showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 4. The effect of apitoxin on hematocrit level showed noticeable decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. The acupuncture was not showed decrease at group 3 & group 4 as compared with the control group in both experimental group I & experimental group II. There were not any statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. 5. The effect of apitoxin on ASO titer showed noticeable decrease at group 3 & group 4 as compared with the control group only in experimental group I. The apitoxin & acupuncture showed decrease at group 3 & group 4 as compared with the control group in experimental group II. There were significantly statistical difference from apitoxin and acupuncture therapy by Duncan's multiple range test. The effect of apitoxin showed slightly decrease as compared with the acupuncture therapy by Duncan's multiple range test.

• The korean journal of orthodontics
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• v.22 no.2 s.37
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• pp.373-388
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• 1992

The purpose of this study was to clarify the histologic changes in the expansion of midpalatal suture by the tensile forces. 39 Sprague-Dawley rats were divided into a control group (3 rats) and three experimental groups (36 rats) -group 1, pressured with a light force(50-75 g), group 2, with a heavy force(250-300 g) and group 3, with a heavy force (250-300 g) plus laser irradiation. Autoradiographic and histopathologic observations were performed in 12, 24, 48 and 96 hours after force delivery. The results were as follows; 1. The anterior portion of midpalatal suture was more separated than the posterior portion in all experimental groups. Group 2 showed more separation than group 1 and no difference to group 3 2. Ligament tearing appeared intensively in 24 hours, but the sutural matrices increased with times. ; Group 2 showed more tearing than group 1, and active regeneration of sutural matrices was observed in group 3. 3. Vascular dilatation appeared intensively in 24 hours and decreased with times. ; The anterior portion of midpalatal suture showed more dilatation than the posterior portion, ; The changes was the greatest in group 3, group 2, group 1, in that order. 4. New bone formation and the new capillary prolieferation began to appear in 12 hours and increased with times, : Group 2 showed more changes than group 1 and no difference to group 3. 5. Infiltration of inflammatory cells was little observed and was the greatest in group 2, group 1, group 3, in that order 6. Positive reaction of cells to $[^3H]$ thymidine was the greatest in 24 hours, and decreased with times ; The reaction was the greatest in group 3, group 2, group 1, in that order.

• The korean journal of orthodontics
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• v.23 no.2 s.41
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• pp.199-216
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• 1993

The purpose of this study was to quantify the biologic effects of the tensile forces from helical springs across the maxillary incisors on the periodontal tissues of rats. 39 Sprague-Dawlely rats were divided into a control group(3 rats) and three experimental groups(36 rats)-group 1, pressured with a light force(50-75g), group 2, with a heavy force(250-300g) and group 3, with a hen force(250-300g) plus laser irradiation. Autoradiographic and histopathologic observations were performed in 12, 24, 48 and 96 hours after force application. The result were as follow : 1. Hyalinized zone of periodontal ligament began to appear at pressure side in 12 hours in group 2 and group 3 ; all decreased in 96 hours except in group 2. 2. Alveolar bone resorption began to appear in 12 hours in group 2 and group 3 ; Group 2 showed more resorption than group 1 and no difference to group 3. 3. Tearing of periodontal ligament and vascular dilatation began to appear at tension side in 12 hours in all groups ; Group 2 showed more changes than group 1 and no difference to group 3 ; Decrease began to appear in 96 hours. 4. New bone formation began to appear at tension side in 12 hours and increased more and more ; No differences were shown of groups 5. New capillary proliferation began to appear at pressure side in 12 hours ; The changes were the greatest in group 3, group 2, group 1, in that order. 6. Positive reaction of cells to $[^3H]-thymidine$ was the greatest in 24 hours of all groups and decreased with times i Group 2 showed more reaction than group 1 and no difference to group 3.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.24 no.2
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• pp.291-304
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• 1994

The purpose of this study was to analyze the facial asymmetry of the patients with the craniomandibular disorder. In this study, 50 patients, who have joint clicking and pain, mouth opening limitation, and 40 dental students, Chosun University, who did not posses any restoration and orthodontic treatment, joint clicking and pain, mouth opening limitation, were selected as the control group. Both the control group and the patient group were takened skull P-A, submento-vertex radiogram by standized methods. After that, the deviation and facial asymmetry were measured and analyzed. The results of the this study were as follows: 1. In the Skull P-A radiogram, the width difference of control group and patient group measured that the △ Cg-Go-Cl: control group were 3.35㎜, patient group were 4.51㎜ (P<0.05), the △Cg-Zy-Go: control group were 1.83㎜, patient group were 3.27㎜(P<0.001). 2. In the Skull P-A radiogram, the height difference of control group and patient group measured that the △ Cg-Go-Cl: control group were 131.85㎜, patient group were 188.45㎜(P<0.05), the △Cg-Zy-Go: control group were 1.58㎜, patient group were 2.68㎜(P<0.00l). 3. In the Skull P-A radiogram, the area difference of control group and patient group measured that the △ Cg-Go-Cl: control group were 120.76㎟, patient group were 185.49㎟(P<0.05), the △Cg-Zy-Go: control group were 2.29㎟, patient group were 3.37㎟(p<0.05). 4. In the submento-vertex radiogram, the width difference of control group and patient group measured that the △Mr-Cl-Ia: control group were 1.50㎜, patient group were 2.35㎜(P<0.05), the △Mr-Cm-Ia: control group were 1.75㎜, patient group were 3.17㎜(P<0.05), the △Mr-Go-Ia: control group were 1.96㎜, patient group were 3.24㎜(P<0.001), the △Mr-Cp-Co: control group were 1.74㎜, patient group were 2.73㎜(P<0.05). 5. In the submento-vertex radiogram, the height difference of control group and patient group measured that the △Mr-Cp-Ia: control group were 1.68㎜, patient group were 2.46㎜P<0.05), the △Mr-CI-Ia: control group were 2.38㎜, patient group were 3.74㎜(P<0.05), the △Mr-Co-Ia: control group were 1.63㎜, patient group were 2.80㎜(P<0.05), the △Mr-Cm-Ia: control group were 1.45㎜, patient group were 3.12㎜(P<0.001). 6. In the submento-vertex radiogram, the area difference of control group and patient group measured that the △ Mr-Cp-Ia: control group were 73.17㎟, patient group were 110.16㎟(P<0.05), the △Mr-Cl-Ia: control group were 105.09㎟, patient group were 180.87㎟(P<0.001), the △Mr-Co-Ia: control group were 103.31㎟, patient group were 148.48㎟(P<0.05), the △Mr-Cm-Ia: control group were 97.01㎟, patient group were 167.83㎟(P<0.05), the △Mr-Go-Ia: control group were 104.24㎟, patient group were 205.90㎟(P<0.05).

• Journal of Korean Academy of Nursing
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• v.32 no.5
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• pp.727-734
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• 2002

This study was to determine the effect of DHEA administration before, during, and after dexamethasone treatment on body weight and TypeI,II muscle weight of rat receiving dexamethasone treatment. Method: Wistar rats were divided into 6 groups: control(C), dexamethasone(D), DHEA administration for 3days after dexamethasone treatment for 7days(7D+3DH), dexamethasone treatment for 7days after DHEA administration for 3days(3DH+7D), DHEA administration during dexamethasone treatment for 4days after dexamethasone treatment for 3days(3D+4DDH), DHEA administration during dexamethasone treatment for 7days(7DDH). Dexamethasone was injected by subcutaneously daily at a dose of 5mg/kg. DHEA was orally administered daily at a dose of 5mg/kg for 7 days. Soleus(TypeI) muscle, and both plantaris and gastro- cnemius(TypeII) muscles were dissected on the 7th day of experiment. Result: Body weight of both 3DH+7D group and 3D+4DDH group increased significantly compared with that of 7D group. Body weight of 7D+3DH group decreased significantly compared with that of 7D group, 7DDH group, 3DH+7D group and 3D+4DDH group. Muscle weight of both plantaris and gastro- cnemius tended to decrease compared with that of 7D group. Muscle weight of 7DDH group, 3D+4DDH group and 3DH+7D group increased significantly compared with that of 7D+3DH group. Muscle weight of gastrocnemius of both 3DH+7D group and 3D+4DDH group increased significantly compared with that of 7D group. Conclusion: Based on these results, it can be suggested that DHEA administration before and during dexamethasone treatment can increase both body weight and mass of atrophied TypeII muscle induced by dexa- methasone treatment.

• Journal of Nutrition and Health
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• v.29 no.3
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• pp.321-330
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• 1996

With changing socio-economic environments, there have been some changes in the Korean diet. One of major changes is the increasing fat intake. Based on the current trend of increase, it is important to understand factors related to fat intake levels. Objective of this study was to find out the differences in food consumption patterns, demographic characteristics, and other socio-economic factors among three groups of households. The households were devided into three groups by percentage of fat energy intake to total energy intake such as less than 15%(Group 1), from 15% to 25%(Group 2), and more than 25% (Group 3). Among 1, 987 households, the numbers in Group 1, Group 2 and Group 3 were 792(39.6%), 902(45.4%), and 293(15.1%), respectively. The mean size of family was 3.44 person per households for total survey household, 3.42 for Group 1, 3.54 for Group 2, and 3.21 for Group 3. More than 60% of families living in the rural area belonged to Group 1(p<0.05). Group 3 had most educated food preparers and more income than other groups(p<0.05). Group 3 showed higher intake of all nutrient analyzed except carbohydrate (p<0.05). Other than calcium and vitamin A for Group 1, and vitamin A for Group 1, and vitamin A for Group 2, all nutrient intake analyzed for three groups were more than 75% of Korean recommended dietary alowances. Mean fat intakes for Group 1, Group 2, and group 3 had highest amount of intake for all food groups. According to food group analysis, Group 3 had highest amount of intake for all food groups except vegetables. Group 3 consumed more than 10 times of meats compared to Group 1. Group 3 had more dishes prepared by baking, deep-fryng, stir-frying, and pan-frying other two groups. Processed foods were used most frequently in Group 3. Other diet and related factors were analyzed also. These results showed that the amount of fat consumed by Korean households varies widely. Households with high fat energy intake had tendency to reside in the largy city, and to have heigher education level and more income than other groups. They eat less vegetables, use more cooking methods using oils, and use more processed foods. To ensure a proper intake of fat, there should be two separate ways of approach for high fat energy group and low fat energy group, since they are different in many ways.

• Restorative Dentistry and Endodontics
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• v.21 no.1
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• pp.300-310
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• 1996

Recently, there have been attempts to obstruct the dentinal tubules and remove the smear layer by way of laser irradiation in the root canal during endodontic treatment. This treatment was designed to make the root canal to be nonporous. Using 33 extracted single rooted teeth, 30 teeth were divided into 3 groups (10 each), and 3 teeth were used as samples for SEM. Using Nd : YAG laser, the control group was not irradiated, experimental group l(1W group) was irradiated with 1W, 15pps, 15sec., 3 times, 6.7mJ and experimental group 2(3W group) was irradiated with 3W, 15pps, 15sec., 3 times 20mJ. Thereafter the roots were immersed in methylene blue for 8 hours, and the dye infiltration pattern was observed under stereomicroscope and canal wall surface change was observed under SEM. The results are as following ; 1. As a result of evaluating the dye infiltration rate of the apical and middle 1/3, there was significant difference between control group and 1W group, control group and 3W group and there was no significant difference between 1 W group and 3W group. 2. In each group, as a result of comparing the dye infiltration rate of the apical and middle 1/3, there was no significant difference in control and 1W group but significant difference in 3W group. 3. In the control group smear layer was scarecely found and many dentinal tubules were found to be open. 4. In the 1W group, the number of dentinal tubules were decreased and gradual changes of the dentin surface could be seen and 3W group, almost no dentinal tubules could be found and the dentin surface was changed a little more and showed signs of partial fusion.