Three linear strain gauges (KFR-02N-120-C1-23, Kyowa, Japan) were placed around the abutment of implant fixture and the maximum axial loads on the mandibular implants supporting overdentures were registered in experimental model when the overdenture was removed. The overdenture attachments used in this study wee Round bar, Hader bar, Dolder bar with and without spacer. The retention of bar attachment was measured using universal testing machine while being controlled by Activating set and Deactivator except in case of the Hader bar. Simultaneously strains were recorded with the strain smart program in strain P-6000 series (Measurement group, Raleigh, USA). The maximum axial load was calculated and compared with each other. The results were as follows: 1. The amount and the timing of the maximum axial loads were different between the right and left implant in all attachment systems. 2. The retention of bar attachment except Hader bar could be adjusted but the controllability was different among the attachment systems. 3. The more the axial load, the higher the retention with Hader bar and Dolder bar without spacer. but the tendency of increase was not shown with round bar and Dolder bar with spacer.
Denture, Overlay* ; Models, Theoretical

No abstract available.
Adhesives* ; Crowns* ; Resin Cements*

No abstract available.
Denture Bases* ; Dentures*

No abstract available.

This study was investigated to compare the staining resistance of soft denture liners. Specimens wee made of Coe-soft. Coe-Comfort, Soft-liner, Visco-gel, and were stored in 1% methyleneblue solution for 24 hours. The amounts of color change before and after treatment with mono-poly and thermocycling were measured by colorimeter(TC-6FX, Tokyo Denshoku Co. Ltd, Japan) for evaluation of staining resistance. The following conclusions were drawn from this study. 1. The staining resistance of Visco-gel was increased, but there was no changer of staining resistance in Coe-soft, Coe-comfort, and Soft-liner after treatment with monopoly. 2. The staining resistance of the Coe-comfort was the least in all soft denture liners. 3. The staining resistance of Visco-gel and Soft-liner were decreased after thermocycling.
Denture Liners* ; Dentures*

Soft denture liners or conditioners may be valuable therapeutic materials. The life of these liners is short and varies, but it can be extended by the use of a mono-poly(polymethyl methacrylate coating material). This study determined whether coating three temporary soft denture liners with mono-poly affected the resiliency of soft liners, and evaluated the ability of mono-poly to prevent water absorption and alcohol loss from the underlying soft liners. 20x12mm cylindrical specimens of Coe-Soft, Soft-Liner, Coe-Comfort soft lining materials were made and divided into two groups of mono-poly uncoated(control) and mono-poly coated specimens. Specimens were immersed in water and compressed on an instron universal testing machine and weighted at initial, 24 hours, 1 week, 2 weeks, and 4 weeks. resiliency was determined by measuring the energy absorbed by the soft liners when stressed to a specific yield point. Mono-poly coating significantly increased the resiliency of the Soft-Liner, but had no effect on the other soft liners. Among the 3 soft liners, Soft-Liner showed the hightest resiliency and modulus of elasticity. The weight loss in Soft-Liner was the least among the 3 liners, and the weight loss in Coe-Soft was decreased by monopoly coating.
Absorption ; Denture Liners* ; Dentures* ; Elastic Modulus ; Water ; Weight Loss

Serum IgE values were determined in 100 patients vith atogic dermatitis in the Department of Dermatology at Severance Hospital, Yonsei University College of Medicine, from Oct. 1, 1978 to Mar. 31, 1980. Mean IgE value of patients is 293. 4 unit/ml which is significantly higher than reference value, and the following results were obtained. 1. The mean IgE value in adults with atopic dermatitis, 339.8 unit/ml, 30 cases: more tian 16 years old) was significantly higher than in children(251. 4 unit /ml, 70 cases). 2. Male patierts showed higher IgE va,lue (mean 324. 5 unit/ml, 62 cases,' than female patients (242.7 unit/ml, 38 cases). 3. No close correlation was demonstrated between IgE values and eosiniphils in blood. 4. Patients with parasitic infesta,tion (5 cases) showed relatively increased IgE values (mean; 116. 2 unit/ml;. 5. Patients wifh bronchial asthma (2 cases) showed high IgE values exceeding 1000 unit/ml, 6. IgE. values roughly correlated with severity of the dermatitis. Four cases with high IgE values exceeding 1000 unit/ml were included in the clinically severe group.
Adult ; Asthma ; Dermatitis ; Dermatitis, Atopic* ; Dermatology ; Female ; Humans ; Immunoglobulin E* ; Male ; Reference Values

No abstract available.
Crowns*

No abstract available.
Crowns* ; Dental Cements*

OBJECTIVE: The aim of this study was to investigate whether embryonic stem (ES) cells can be established from isolated blastomeres of mouse embryos. METHODS: Blastomeres were separated from mouse (C57Bl/6J) 2- or 4-cell embryos. Isolated blastomeres or whole 4-cell embryos were co-cultured with mitosis-arrested STO feeder cells in DMEM supplemented with recombinant murine leukemia inhibitory factor and ES-qualified fetal bovine serum. After the tentative ES cell lines were maintained from isolated blastomeres or whole embryos, some of them were frozen and the others were sub-cultured continually. Characteristics of tentative ES cell lines as were evaluated for specific gene expressions with immunocytochemistry and RT-PCR. RESULTS: One ES cell line (3.0%) was established from isolated blastomere of 2-cell embryo and one cell line (4.0%) from isolated two blastomeres of 4-cell embryo. And five cell lines (16.7%) were established from whole 4-cell embryos. Both cell lines from isolated blastomere and whole embryo expressed mouse ES cells specific markers such as SSEA-1, Oct-4 and alkaline phosphatase. Marker genes of three germ layers were expressed from embryoid bodies of both cell lines. CONCLUSION: This study suggests that mouse ES cells could be established from isolated blastomeres, although the efficiency is lower than whole embryos. This animal model could be applied to establishment of autologous human ES cells from biopsied blastomeres of preimplantation embryos in human IVF-ET program.
Alkaline Phosphatase ; Animals ; Antigens, CD15 ; Blastocyst* ; Blastomeres* ; Cell Line ; Embryoid Bodies ; Embryonic Stem Cells* ; Embryonic Structures ; Feeder Cells ; Gene Expression ; Germ Layers ; Humans ; Immunohistochemistry ; Leukemia Inhibitory Factor ; Mice* ; Models, Animal