1.A study on oral sensory function in the implant-supported prosthesis wearers.
Kyoung Soo JANG ; Yung Soo KIM
The Journal of Korean Academy of Prosthodontics 1991;29(1):215-232
No abstract available.
Prostheses and Implants*
;
Sensation*
2.Experimental studies on the tissue response of HA coated, TPS and Al2O3 artificial root implants.
The Journal of Korean Academy of Prosthodontics 1991;29(2):267-284
No abstract available.
3.A study on the osseointegrated prosthesis using three dimensional finite element method.
The Journal of Korean Academy of Prosthodontics 1991;29(1):167-212
No abstract available.
Prostheses and Implants*
4.An electrochemical study on the corrosion resistance of the various implant metals.
The Journal of Korean Academy of Prosthodontics 1993;31(3):423-446
No abstract available.
Corrosion*
;
Metals*
6.A case of distal type of renal tubular acidosis in a neonate.
Sung Sub SHIM ; Young Joon KIM ; Jae Hong PARK ; Soo Yung KIM ; Chan Yung KIM
Journal of the Korean Pediatric Society 1992;35(7):1014-1018
No abstract available.
Acidosis, Renal Tubular*
;
Humans
;
Infant, Newborn*
7.A Study on The Flexural Bond Strength of The Gold and The Co-Cr Alloy To The Denture Base Resins.
Hyun Joo PARK ; Chang Whe KIM ; Yung Soo KIM
The Journal of Korean Academy of Prosthodontics 2000;38(4):500-509
In general, the three major oral functions of edentulous patients-mastication, phonation, esthetics-can be rehabilitated by the complete dentures, and both the resin based complete denture and the metal based complete denture are commonly used by many clinicians today. For the sake of many advantages such as the excellent thermal conductivity, low volumetric change, high strength, low risk of fracture and the better patient's adaptation, the metal based complete dentures are indicated to the several cases. But, there are common failures of these type of dentures mainly by the fracture or the debonding between the resin structures and the metal frameworks which is caused by the discrepancies by the discrepancies of the flexural strength and the coefficient of thermal expansion. This is aggravated by the water contamination of the interface when exposed to the oral environment and results in the failure of complete denture treatment. So, the purpose of this study is to compare the bond strength and the fracture patterns of the gold alloy based and the Co-Cr alloy based complete dentures using the PMMA resins and the 4-META adhesive resins. The results of this study were as follows. 1. Both to th PMMA resin and the 4-META resin, the flexural bond strength of gold alloy is lower than that of Co-Cr alloy(p<0.05). 2. To the Co-Cr alloy, the bond strength of the 4-META resin is significantly higher tan that of PMMA resin(P<0.05). 3. The flexural strength of the group with the mechanical retention form is significantly higher than that of the group without retention form(P<0.05). 4. Comparing with the other groups, the fracture patterns of the group 3 are quite different from the group 1, 2, 5.
Adhesives
;
Alloys*
;
Denture Bases*
;
Denture, Complete
;
Dentures*
;
Phonation
;
Polymethyl Methacrylate
;
Thermal Conductivity
;
Triacetoneamine-N-Oxyl
8.ANALYSIS OF THE FIT IN THE IMPLANT PROSTHESIS USING LASER DISPLACEMENT METER AND THREE-DIMENSIONAL FINITE ELEMENT METHOD.
Ho Beom KWON ; Yung Soo KIM ; Chang Whe KIM
The Journal of Korean Academy of Prosthodontics 2001;39(6):611-624
A precise fit of the implant prosthesis is one of the most important factors in preventing mechanical complications. To analyze the degree of the misfit of implant prosthesis, a modal testing experiment was accomplished. And to interpret the modal testing analysis mathematically, three-dimensional finite element models were established. In the experimental modal testing analysis, with a laser displacement meter, FFT analyzer, impact hammer, etc., natural frequencies of the models with various degree of prosthesis fit were determined after the frequency response function were calculated. In the finite element analysis, the natural frequencies and mode shapes of the models which simulated those of experimental modal testing were computed. The results were as follows : 1. Natural frequencies of the prosthesis-abutment were related to the contact state between components. 2. In the modal testing experiment, the natural frequencies increased from 50micrometer to 200micrometer gap and reached a plateau. 3. In the finite element analysis, the natural frequencies decreased gradually according to the increase of the gap size. 4. In the finite element analysis, the mode shapes of model 1 with misfitting prosthesis showed different patterns from those without misfitting prosthesis. 5. The devices including a laser displacement meter used in this study were useful for measuring the natural frequencies of an implant prosthesis which had various degrees of fit.
Finite Element Analysis
;
Prostheses and Implants*
9.EFFECTS OF CHOPPED GLASS FIBER ON THE STRENGTH OF HEAT-CURED PMMA RESIN.
Sang Il LEE ; Chang Whe KIM ; Yung Soo KIM
The Journal of Korean Academy of Prosthodontics 2001;39(6):589-598
The fracture of acrylic resin dentures remains an unsolved problem. Therefore, many investigations have been performed and various approaches to strengthening acrylic resin, for example, the reinforcement of heat-cured PMMA resin using glass fibers, have been suggested over the years. The aim of the present study was to investigate the effect of short glass fibers treated with silane coupling agent on the transverse strength of heat-polymerized PMMA denture base resin. To avoid fiber bunching and achieve even fiber distribution, glass fiber bundles were mixed with PMMA powder in conventional mixer whose blade was modified to be blunt. Composite of glass fiber (11micrometer diameter, 3mm & 6mm length, silane treated) and PMMA resin was made. Transverse strength and Young's modulus were estimated. Glass fibers were incorporated with 1%, 3%, 6% and 9% by weight. Plasticity and workability of dough was evaluated. Fracture surface of specimens was investigated by SEM. The results of this study were as follows 1. 6% and 9% incorporation of 3mm glass fibers in the PMMA resin enhanced the transverse strength of the test specimens (p<0.05). 2. 6% incorporation of 6mm glass fibers in the PMMA resin increased transverse strength, but 9% incorporation of it decreased transverse strength (p<0.05). 3. When more than 3% of 3mm glass fibers and more than 6% of 6mm glass fibers were incorporated. Young's modulus increased significantly (p<0.05). 4. Workability decreased gradually as the percentage of the fibers increased. 5. Workability decreased gradually as the length of the fibers increased. 6. In SEM and LM, there was no bunching of fibers and no shortening of fibers.
Denture Bases
;
Dentures
;
Elastic Modulus
;
Glass*
;
Plastics
;
Polymethyl Methacrylate*
10.A comparative study on subgingival microbial composition between natural teeth and osseointegrated implants.
Yong Sik LIM ; Yung Soo KIM ; Chang Whe KIM
The Journal of Korean Academy of Prosthodontics 1993;31(3):411-422
No abstract available.
Tooth*