1.Marcy's repair in indirect inguinal hernia.
Journal of the Korean Surgical Society 1992;43(3):445-452
No abstract available.
Hernia, Inguinal*
2.Economic Consideration of Mass Screening Program for Early Detection of Carcinoma of the Uterine Cervix.
Korean Journal of Preventive Medicine 1974;7(2):367-372
No abstract available.
Cervix Uteri*
;
Female
;
Mass Screening*
3.Influence of Thickness of Empress 2 Ceramic on Fracture Strength.
Jung Woo KOH ; Jae Ho YANG ; Sun Hyung LEE
The Journal of Korean Academy of Prosthodontics 2000;38(4):446-460
All ceramic restorations have had a more limited life expectancy than metal ceramic crowns because of their lower strength. The relatively lower strength has limited the use of all-ceramic crowns to the areas where occlusal loads are lower. Therefore many researches have been done to increase the strength of all-ceramic crowns. IPS Empress 2 is a new type of lithium disilicate glass-ceramic with enhanced physical characteristics which has been in use clinically since 1998. Previous researches reported that the flexural strength of all-ceramic material was greater than 300MPa, and all-ceramic crowns can be used in staining or layering technique. The objective of this study was to investigate the influence of the thickness of IPS Empress 2 ceramic on fracture strength. Both staining technique and layering technique was investigated. Vita VMK was used as control. For all three groups, five specimens each of 0.8mm, 1.0mm, 1.4mm, 1.8mm, and 2.2mm thickness (a total of 75 specimens) were prepared. Control group: Vita VMK Porcelain specimens were prepared with dentine ceramic and liquid glazing was done. Group I: IPS Empress 2 were prepared with staining technique and stained twice and glazed once. Group II : IPS Empress 2 were prepared with layering technique and glazed after wash firing. The thickness and diameter of the specimen were measured and controlled after specimen preparation. Biaxial Flexure Test (ASTM Standard F394-78) was adopted as this test method produces results least affected by the edge condition of the specimens. Fracture strength was measured with Instron Universal Testing Machine. Conclusions are as follow : 1. The fracture strength was increase in order of control group, test group I, test group II. 2. Fracture strength of the group I(Empress 2 Staining) was 65.54 N in 0.8mm, 155.2 N in 1.0mm, 233.5 N in 1.44mm, 434.5 N in 1.8mm, and 600.1 N in 2.2mm. 3. Fracture strength of the group II (Empress 2 Layering) was 190.0 N in 0.8mm, 283.5 N in 1.0mm, 437.2 N in 1.4mm, 732.0 N in 1.8mm, and 1115.0 N in 2.2mm. 4. No statistical difference was found in flexural strengths according to thickness in a specified group(p>0.05).
Ceramics*
;
Crowns
;
Dental Porcelain
;
Dentin
;
Fires
;
Life Expectancy
;
Lithium
4.FRACTURE STRENGTH AND MARGINAL FIT OF IN-CERAM, COPY-MILLED IN-CERAM, AND IPS EMPRESS 2 ALL-CERAMIC BRIDGES.
Jung Won HWANG ; Jae Ho YANG ; Sun Hyung LEE
The Journal of Korean Academy of Prosthodontics 2001;39(6):641-658
All-ceramic restorations have become an attractive alternative to porcelain-fused-to-metal crowns. In-Ceram, and more recently IPS Empress 2 were introduced as a new all-ceramic system for single crowns and 3-unit fixed partial dentures. But their strength and marginal fit are still an important issue. This study evaluated the fracture resistance and marginal fit of three systems of 3 unit all-ceramic bridge fabricated on prepared maxillary anterior resin teeth in vitro. The 3 all-ceramic bridge systems were: (1) a glass-infiltrated, sintered alumina system (In-Ceram) fabricated conventionally, (2) the same system with copy-milled alumina cores (copy-milled In-Ceram), (3) a heat pressed, lithium disilicate reinforced glass-ceramic system (IPS Empress 2). Ten bridges of each system with standardized design of framework were fabricated. All specimens of each system were compressed at 55degree at the palatal surface of pontic until catastrophic fracture occurred. Another seven bridges of each system were fabricated with standard method. All of the bridge-die complexes were embedded in epoxy resin and sectioned buccolingually and mesiodistally. The absolute marginal discrepancy was measured with stereomicroscope at x50 power. The following results were obtained: 1. There was no significant difference in the fracture strength among the 3 systems studied. 2. The Weibull modulus of copy-milled In-Ceram was higher than that of In-Ceram and IPS Empress 2 bridges. 3. Copy-milled In-Ceram (112micrometer) exhibited significantly greater marginal discrepancy than In-Ceram (97micrometer), and IPS Empress 2 (94micrometer at P=0.05. 4. The lingual surfaces of the ceramic crowns showed smaller marginal discrepancies than mesial and distal points. There was no significant difference between teeth (incisor, canine) at P=0.05. 5. All-ceramic bridges of three systems appeared to exhibit sufficient initial strength and acceptable marginal fit values to allow clinical application.
Aluminum Oxide
;
Ceramics
;
Crowns
;
Denture, Partial, Fixed
;
Hot Temperature
;
Lithium
;
Tooth
5.A Clinical Study of Neuroblastoma.
Jung Sook HONG ; Yang Dong PARK ; Il Whan KIM ; Hyun Gi JUNG ; Jae Sun PARK
Journal of the Korean Pediatric Society 1987;30(1):80-88
No abstract available.
Neuroblastoma*
6.Clinico-statistical analysis of the laryngeal polyp and nodule.
Han Woong JUNG ; Yang Sun LEE ; Jae Yul PARK ; Sin Il KWAK ; Jung Jae SEO
Korean Journal of Otolaryngology - Head and Neck Surgery 1992;35(3):395-402
No abstract available.
Polyps*
7.Microleakage and water stability of resin cements.
Sun Young CHOI ; Sun Hyung LEE ; Jae Ho YANG ; Jung Suk HAN
The Journal of Korean Academy of Prosthodontics 2003;41(3):369-378
STATEMENT OF PROBLEM: Recently, resin cements have become more widely used and have been accepted as prominent luting cements. Current resin cements exhibit less microleakage than conventional luting cements. However, the constant contact with water and exposure to occlusal forces increase microleakage even in resin cements inevitably. Most bonding resins have been modified to contain a hydrophilic resin such as 2-hydroxyethylmethacrylate (HEMA) to overcome some of the problems associated with the hydrophobic nature of bonding resins. By virtue of these modifications, bonding resins absorb a significant amount of water, and there may also be significant stresses at bonding interfaces, which may adversely affect the longevity of restorations. Therefore the reinforcement of water stability of resin cement is indispensable in future study. PURPOSE: This study was conducted to examine the influence of water retention on microleakage of two resin cements over the period of 6 months. MATERIALS AND METHODS: 32 ex acted human teeth were used to test the microleakage of a single full veneer crown. Two resin cements with different components and adhesive properties - Panavia F (Kuraray Co., Osaka, Japan) and Super-Bond C&B (Sun Medical Co., Kyoto, Japan)- were investigated. The storage medium was the physiological saline solution changed every week for 1 month, 3 months, and 6 months. One group was tested after storage for 1 day. At the end of the each storage period, all specimens were exposed to thermocycling from 5.C to 55.C of 500 cycles and chewing simulation of 50,000 cycles, and then stained with 50% silver nitrate solution. The linear penetration of microleakage was measured using a stereoscopic microscope at x 40 magnification and a digital traveling micrometer with an accuracy of +/-3 um. Values were analyzed using two-way ANOVA test, Duncan's multiple range tests (DMRT). RESULTS: Statistically significant difference of microleakage was shown in the 3-month group compared with the 1-day or 1-month group in bot systems (p<0.05) and there were statistically significant differences in microleakage between the 3-month group and the 6-month group in both systems (p<0.05). The two systems showed different tendency in the course of increased microleakage during 3 months. In Panavia F, microleakage increased slowly throughout the periods. In Super-Bond C&B, there was no significant increase of microleakage for 1 month, but there was statistically significant increase of microleakage for the next 2 months. For the mean microleakage for each period, in the 3-month group, microleakage of Super-Bond C&B was significantly greater than that of Panavia F. On the other hand, in the 6-month group, microleakage of Panavia F was significantly greater than that of Super-Bond C&B (p<0.05). CONCLUSION: Within the limitation of this study, water retention of two different bonding systems influence microleakage of resin cements. Further studies with the longer observation periods in viro are required in order to investigate water stabilty and the bonding durability of the resin cement.
Adhesives
;
Bite Force
;
Crowns
;
Hand
;
Humans
;
Longevity
;
Mastication
;
Resin Cements*
;
Silver Nitrate
;
Sodium Chloride
;
Tooth
;
Virtues
;
Water*
8.Effects of Perineal Care with Aroma Essential Oil on the Decrease of Urinary Tract Infection in Patients with Indwelling Urinary Catheter.
Sun Hee YUN ; Yang Sook YOO ; Jae Jung LEE ; Jung Hee CHA
Journal of Korean Academy of Adult Nursing 2006;18(2):314-326
PURPOSE: This study was designed to verify effects of perineal care with aroma essential oil on urinary tract infection(UTI) in patients with indwelling urinary catheter. METHOD: The research design was non equivalent control group pretest-post test design. The data were collected from March to August, 2005 at C university hospital in Seoul. The subjects were 43 patients who had a indwelling catheter in neurosurgery intensive care unit(NSICU). They were assigned to two groups, 21 subjects to the experimental group and 22 subjects to the control group. The experimental group received perineal care with 3% blending essential oil for 4 days. RESULTS: In the experimental group, white blood cells and bacteria in urine were significantly lower than control group. Bacteria in urine culture was lower in the experimental group at post test. CONCLUSION: Perineal care with aroma essential oil could be an effective intervention to reduce the UTI of patients in NSICU.
Aromatherapy
;
Bacteria
;
Catheters, Indwelling
;
Humans
;
Critical Care
;
Leukocytes
;
Neurosurgery
;
Research Design
;
Seoul
;
Urinary Catheters*
;
Urinary Tract Infections*
;
Urinary Tract*
9.Risk Factors of Arthritis in Middle-aged Women in Korea.
Kyung Mi YANG ; Soon Lae KIM ; Jong Eun LEE ; Hye Sun JUNG ; Sook In KIM ; So Young LEE ; Yoon Jung LEE
Journal of Korean Academy of Community Health Nursing 2006;17(4):512-520
No abstract available.
Arthritis*
;
Female
;
Humans
;
Korea
;
Risk Factors*
10.Risk Factors of Arthritis in Middle-aged Women in Korea.
Kyung Mi YANG ; Soon Lae KIM ; Jong Eun LEE ; Hye Sun JUNG ; Sook In KIM ; So Young LEE ; Yoon Jung LEE
Journal of Korean Academy of Community Health Nursing 2006;17(4):512-520
No abstract available.
Arthritis*
;
Female
;
Humans
;
Korea
;
Risk Factors*