1.Flexure strength of acrylic resin temporary brigde by pontic design.
Sang Chun OH ; Tai Ho JIN ; Jin Keun DONG
The Journal of Korean Academy of Prosthodontics 1992;30(1):65-72
No abstract available.
Denture, Partial, Fixed*
2.A Clinical Study On The Occurrence Of Food Impaction.
Jae Hoon JUNG ; Sang Chun OH ; Jin Keun DONG
The Journal of Korean Academy of Prosthodontics 2000;38(1):50-58
The purpose of this study was to investigate the causes of food impaction and to explore solutions as well. For this study, 39 patients with food impaction wee selected. 77 contact areas in these patients were investigated mobility, tightness of contact area, gingival index, plaque index, attachment loss, alveolar bone loss, proximal caries, marginal ridge distance and occlusal relationships. The results were as follows ; 1. Teeth without distal support were found to be the most frequent site of food impaction (41.6%). Food impaction was found to be more frequent in the upper teeth (66.2%) than the lower teeth (33.8%). 2. Food impaction was found in tight contact cases (71.4%). Alveolar bone loss was not found in the early stage of food impaction (83.1%) 3. The distance between the marginal ridges of food impaction sites (mean=0.48mm) was shorter than that of the control group. (mean=0.77mm) (p<0.001) 4. In 18.2% of t he cases, proximal carries were found at the food impaction site. 5. Food impaction affected patient's occlusion with the following frequencies ; cusp to marginal ridge relationship (72.7%), cusp to fossa relationship (3.9%) and stepped relationship (23.4%).
Alveolar Bone Loss
;
Humans
;
Periodontal Index
;
Tooth
3.Hypnotics and cognitive function.
Bong Joo OH ; Jin Sang YOON ; Hyung Yung LEE
Journal of Korean Neuropsychiatric Association 1992;31(4):756-766
No abstract available.
Hypnotics and Sedatives*
4.Varus derotation osteotomy by MacEwen and Shands in congenital dislocation of the hip before the age of five.
Kwang Jin RHEE ; Sang Rho AHN ; Sun Tae OH
The Journal of the Korean Orthopaedic Association 1992;27(5):1381-1394
No abstract available.
Dislocations*
;
Hip*
;
Osteotomy*
6.A STUDY ON THE WEAR OF DENTAL RESTORATIVE MATERIALS.
Sang Ho EOM ; Sang Chun OH ; Jin Keun DONG
The Journal of Korean Academy of Prosthodontics 1998;36(3):514-523
The purpose of this study was to compare the wear characteristics of Type III Gold Alloy (Degular C; Degussa AG), VMK 95 (Vita Zahnfabrik), Vitadur Alpha (Vita Zahnfabrik), IPS Empress (Ivoclar-Vivadent) and Targis (Ivoclar-Vivadent). Ten samples of each material were abraded against enamel of extracted incisors for 160,000 cycles on the wear machine. The depth of wear scars on enamel was analized with profilometer (Alpha-step 200; Tencor). And the wear of material specimen was determined with micrometer (PB-1B; Mitutoyo Co. Japan). The results obtained were as follows : 1. Type III gold alloy (2.47micrometer) and Targis (5.89micrometer) caused less wear of enamel specimens compared to VMK 95 (75.59micrometer), IPS Empress (78.60micrometer) and Vitadur Alpha (78.89micrometer) (p<0.05). 2. The wear of material specimen when opposing enamel was the lowest in type III gold alloy (3.0micrometer), followed by Targis (69.8micrometer), IPS Empress (148.4micrometer). VMK 95 (298.0micrometer) and Vitadur Alpha (300.8micrometer) exhibited the most severe wear against enamel (p<0.05).
Alloys
;
Cicatrix
;
Dental Enamel
;
Incisor
7.FRACTURE STRENGTH OF THE IPS EMPRESS CROWN:THE EFFECT OF OCCLUSAL DEPTH AND AXIAL INCLINATION ON UPPER FIRST PREMOLAR CROWNS.
Jin Keun DONG ; Sang Chun OH ; Sang Don KIM
The Journal of Korean Academy of Prosthodontics 1999;37(1):127-133
The purpose of this study was to compare the fracture strength of the IPS Empress ceramic crown according to the occlusal depth (1.5mm, 2.0mm, 2.5mm) and axial inclination (4degree, 8degree, 12degree) of the upper first premolar. After 10 metal dies were made for each group, the IPS Empress ceramic crowns were fabricated and each crown was cemented on each metal die with resin cement. The cemented crowns mounted on the testing jig were inclined 30 degrees and a universal testing machine was used to measure the fracture strength. The results were : 1. The fracture strength of the ceramic crown with 2.5mm depth and 12degreeinclination was the highest (630N). Crowns of 1.5mm depth and 4degreeinclination had the lowest strength(378N). There were no significant differences of the fracture strength by axial inclination in same occlusal depth group. 2. The fracture mode of the crowns was similar. Most of fracture lines began at the loading area and extended through proximal surface perpendicular to the margin, irrespective of occlusal depth.
Bicuspid*
;
Ceramics
;
Crowns*
;
Resin Cements
8.Clinical significance and incidence of antineutrophil cytoplasmic antibody.
Jung OH ; Yeong Jin CHOI ; Seok Jin KANG ; Byung Kee KIM ; Sang In SHIM ; Sun Moo KIM
Korean Journal of Clinical Pathology 1993;13(2):295-302
No abstract available.
Antibodies, Antineutrophil Cytoplasmic*
;
Incidence*
9.Clinical Experience of the Tibial Plateau Fracture
Jin Hwan AHN ; Sang Eun LEE ; Cheol Jin OH ; Seung Key KIM
The Journal of the Korean Orthopaedic Association 1990;25(3):684-691
The intra-articular tibial plateau fracture can induce many complications of the knee joint after conservative treatment or operative treatment. Recent experience could decrease the complications with accurate anatomical reduction, stable internal fixation and early knee ROM exercise, but still unsatisfactory results were reported from 20% to 40%. The authors analyzed the 30 cases that could be follow-up from 1 year to 6 years and were treated with operative methods, and the following results were obtained. 1. The most common cause of injury was traffic accident (14 cases-46.4%). 2. The most common fracture type by Hohls classification was type VI (13 cases-43.1%). 3. According to Blokker's criteria, 26 cases (86.7%) among 30 cases had satisfactory results. 4. The one of the most important factor influencing end results was thught to be the anatomical reduction of the articular margin.
Accidents, Traffic
;
Classification
;
Follow-Up Studies
;
Knee
;
Knee Joint
10.Clinical Experience of the Ilizarov Application for Correction of Ulnar Defect with a Dislocated Radial Head: 2 Cases report
Kwang Jin LEE ; Sang Rho AHN ; Chan Hee PARK ; Jin Sun JEONG ; Kee Young OH
The Journal of the Korean Orthopaedic Association 1995;30(5):1267-1271
2 patients of forearm deformities with ulnar defect and radial head dislocation were treated with the Ilizarov apparatus at Chungnam University Hospital. One patient had a severe hypoplastic remnant-like ulnar fragment and a anterolaterally dislocated radial head due to complicated osteomyelitis of ulnar. We applied an Ilizarov apparatus to transport the radial head distally, and fixed to remaining proximal ulnar fragment. The other had a large bony defect at the ulnar shaft and a dislocated radial head due to complicated osteomyelitis of ulna. We performed internal transport of ulna to decreased the ulnar defect and to descend the dislocated radial head. The clinical-radiological features and functional results of those 2 forearm deformities were described with brief review of the articles about the Ilizarov method for correction of forearm defor- mities.
Chungcheongnam-do
;
Congenital Abnormalities
;
Dislocations
;
Forearm
;
Head
;
Humans
;
Ilizarov Technique
;
Osteomyelitis
;
Ulna