The aim of this study was to compare wear resistance of resin denture teeth opposing various restorative materials. The wear resistance of conventional acrylic resin teeth (Trubyte Biotone) and three high-strength resin teeth(Bioform IPN, Endura, SR-Orthosit-PE) opposing different restorative materials (gold alloys, dental porcelain, composite resin) was compared. Wear tests were conducted with a sliding-induced wear testing apparatus which applied 100,000 strokes to the specimen in an mesio-distal direction under conditions of 100 stroke/min and constant loading of 1Kgf/tooth. Wear resistance of the resin denture teeth was evaluated by the following criteria : 1) wear depth, 2)weight loss, and 3) SEM observation. Results were as follows. 1. When opposed to gold alloys and composite resin, high-strength resin teeth showed superior wear resistance compared to acrylic resin teeth. But, in cases opposing dental porcelain, differences between the wear of the high-strength and acrylic resin teeth were not statistically significant (p<0.05). 2. When comparing wear resistance among high-strength resin teeth, opposing gold alloys, Endura was slightly more resistant and while in cases opposing dental porcelain, SR-Orthosit-PE was showed to be slightly resistant(p<0.05). 3. The wear of high-strength resin teeth was greater by 5 to 7 times when opposing porcelain and 2 to 3 times when opposing composite resin compared to gold alloys(p<0.05). 4. SEM observations of the wear surface showed that wear of resin teeth opposing gold alloys is a fatigue type of wear and wear of resin teeth opposing dental porcelain is fatigue and abrasion type of wear. Trubyte Biotone showed more severe fatigue type of wear than high-strength resin teeth. In conclusion, the use of dental porcelain should seriously be considered as restorative material in cases opposing resin denture teeth and improvement seems to be needed on resin teeth in the areas of wear resistance.
Dental Alloys ; Dental Porcelain ; Dentures* ; Fatigue ; Gold Alloys ; Stroke ; Tooth*

Fifty seven consecutive trochanteric hip fracture treated with Smith-Petersen nail and Thornton plate who were treated at the Department of Orthopedic Surgery, St. Marys Hospital Catholic Medical College, during the period of January 1969 to September 1975 were reviewed. This covered a period of six years and nine months. Of the fifty seven cases treated with this method, only thirty four cases were able to be analysed completely. Of these thirty four cases, in two cases the nail penetrated to the hip joint, four cases showed a loosening bolt of the S-P nail, one case involved a delayed union and three cases resulted in malunion, showing a total failure rate of 29.4%. In addition, four cases of intertrochanteric hip fractures of children were reviewed. 1) The sex ratio was 2.1:1 (male to female). Those in their fifth decade showed the highest incidence at 26.3%, next came those in their third decade. 2) The most common cause of the trochanteric hip fractures was traffic accidents (57.9%), other cause were slipping or falling down, direct trauma and pathological fractures. 3) The ratio of left trochanteric hip fractures to right was 7:6. 4) In the group which received external immobilization with Buck's extension skin traction and delayed weight bearing method, the results were better than that group to which external immobilization was not applied and early weight bearing was allowed. 5) The group which received the external immobilization and delayed weight bearing method showed a total failure rate of 21.8% 6) The group to which external immobilization was not applied and early weight bearing was allowed a total failure rate of 64%.
Accidental Falls ; Accidents, Traffic ; Child ; Clinical Study ; Femur ; Fractures, Spontaneous ; Hip ; Hip Fractures ; Hip Joint ; Humans ; Immobilization ; Incidence ; Methods ; Orthopedics ; Sex Ratio ; Skin ; Traction ; Weight-Bearing

Even though various kinds of diagnostic and therapeutic measures have been used for the detection and cure of the acute osteomyelitis, this disease is difficult to be eradicated in many clinical cases. However it is rather easy to treat once this disease can be detected in early stage. So far radiological examination and many kinds of maneuvers including blood culture, clinical laboratory, xeroradiography, computed tomography have been performed for the early detection of this disease but invalid in the most cases. Recently some authors reported that the bone scanning was useful for the early detection of acute osteomyelitis, but this method also had difficulty in differential diagnosis and uncertaninty of its activity. This study aims to try to find methods of early detection of acute osteomyelitis. Experimental osteomyelitis was developed by the inoculation of Staphylococcus aureus to proximal tibias of 39 young rabbits already sclerosed by solution of sodium morrhuate. By comparing the clinical, radiological, bacteriological and laboratory findings in sequence from 2 days to 7 weeks after inoculation, the following results were obtained. 1. The incidence of experimental osteomyelitis after inoculation of staphylococcus aureus SNUH-S-188 in suspension of 1×10(7) colony forming units was 84%, 74%, and 79% in radiological, blood culture and pathologic examination respectively. 2. The leucocytosis was noticed only in early stage and slight degree of anemia was found during the 1st and 2nd weeks after inoculation. The sedimentation rate was increased only in early acute stage and same was eosinophil count. The leucocyte alkaline phosphatase(LAP) and platelet count. showed no significant abnormal changes. 3. Lymphocyte and eosinophil turned over from normal and eosinophil was predominant in experimental osteomyelitis. 4. Serum calcium, phosphorus, total protein and albumin showed significant decrease in all stages and was conversely paralle1 to changes in groin temperature. The level of BUN was normal indicating normal kidney function in experimental osteomyelitis. 5. Even though the enzymes of which showed no significant changes enrolled alkaline phosphatase and serumgluiamicoxalic-transaminase(S-GOT), but some increa.e was attained to 27% and 44% respectively. 6. It is important and significant to find continuous increase of lactic dehydrogenase (LDH) and creatine phosphokinase (CPK) since 48 hours after inoculation and author, think these will be the reliable and sensitive indices in early detection of the development of osteomyelitis and efficacy of therapeutic measures.
Alkaline Phosphatase ; Anemia ; Calcium ; Creatine Kinase ; Diagnosis, Differential ; Eosinophils ; Groin ; Incidence ; Kidney ; Lymphocytes ; Methods ; Osteomyelitis ; Oxidoreductases ; Phosphorus ; Platelet Count ; Rabbits ; Sodium Morrhuate ; Staphylococcus aureus ; Staphylococcus ; Stem Cells ; Tibia ; Xeroradiography

No abstract available.
Stress Disorders, Post-Traumatic* ; Thyroid Gland*

Although many studies on the cytotoxicity of the dental cast metal alloys and their components have been carried out, the results are rather conflicting because of the different type of cells used and the various experimental procedures taken. Recently, a number of scientists have claimed that it would be preferable to focus on the use of cells from relevant specific location of the human bodies. Consequently, the primary cultured oral keratinocyte derived from oral mucous along with nickel chloride and several of widely used dental cast base metal alloys(two-Ni-Cr alloys and one Co-Cr alloy)in domestic were selected for this study, from which 1) The amounts of released metal ions were determined using atomic absorption spectrometry, 2) The cytotoxicity of nickel chloride and dental cast base metal alloys was evaluated via MTT assay, and finally, 3) The amounts of released metal ions and the cytotoxicity of nickel chloride were correlated with the cytotoxicity of dental cast base metal alloys And, the results were summarized as follows ; 1. Nickel ion from Ni-Cr alloys and Cobalt ion from Co-Cr alloys resulted in maximum releasing rate during first 24 hours, followed by a decrease in releasing rate with time. Chromium ion were found to be minimal in all alloys. 2. In cytotoxic test, with 40muM, 80muM of nickel chloride, there were observed an increase in the relative cell number compared to control samples after 24 hours. With 160muM, there was found to be no difference in the relative cell number with control, except that 48 hour showed a increase in relative cell number. With 320muM, the relative cell number remained constant and decreased after 48 hours, and with 640muM, a continuing decrease in relative cell number was observed throughout test period. 3. The sensitivity of primary cultured oral epithelium to nickel was lower compared to the cells used in other studies. 4. CB-80 Soft and Regalloy showed no cytotoxicity to primary cultured oral epithelium and New crown resulted in a slight cytotoxicity. In conclusion, it was shown that the primary cultured oral keratinocytes could be applied successfully as testing cells in cytotoxicity test. Futhermore, the dental cast base metal alloys used in this study were found to be biocompatible.
Absorption ; Alloys* ; Cell Count ; Chromium ; Cobalt ; Crowns ; Epithelium ; Human Body ; Humans* ; Ions ; Keratinocytes* ; Nickel ; Spectrum Analysis

No abstract available.
Humans*

Intrinsic plus deformity, which results in severe functional impairment of the hand, is caused by contracture of intrinsic muscles. This deformity can be resulted from many causes such as ischemic damage, spasm of intrinsic muscles, thermal injury, and so on. The surgical release of tightened intrinsic muscles, may be the only solution to make usable hand, especially for severe cases. Sixty five digits in 22 patients who were operated on from 1982 to 1992, were evaluated retrospectively, to analyse the effects of surgery for intrinsic plus hand. Among 65 digits, 13 were thumbs and 52 fingers. The mean age of the patients was 26 years and 8 months and 17 cases were males and 6 females. The causes were ischemic damage by laceration or crushing injuries in 11 patients, compartment syndrome in 5, cerebral palsy in 5, and burn in one. Involved digits were thumb only in 4 patients, thumb and fingers in 9, and fingers in nine. All the digits were classified preoperatively by Zancolli's classification. In 13 thumbs retropulsion contracture was 4 and adduction-antepulsion contracture was nine. All of the thumbs were treated by intrinsic release and Z plasty(or rotational flap). Other procedures including arthrolysis, arthrodesis and tendon reconstruction were combined in 9 thumbs. In 52 fingers, in addition to distal release, arthrolysis was combined in 12 fingers, and arthrolysis plus volar plate release were combined in 4 fingers. For the assessment, our criteria, based on subjective satisfaction of the patient and range of motion, was used. The duration of follow up was from one year to 9 years with the average of 26 months. In 14 thumbs the results were excellent in 2, 6 good, 4 fair, and one poor. In 52 fingers excellent was 12, 24 good, 13 fair, and 3 poor. In summary we could improve the function of intrinsic plus deformity by appropriate sugery, and their results were good.
Arthrodesis ; Burns ; Cerebral Palsy ; Classification ; Compartment Syndromes ; Congenital Abnormalities ; Contracture ; Female ; Fingers ; Follow-Up Studies ; Hand ; Humans ; Lacerations ; Male ; Muscles ; Range of Motion, Articular ; Retrospective Studies ; Spasm ; Tendons ; Thumb

The majority of cystic lesions of the pancreas are psudocysts and a small fraction neoplastic. Failure to recognize the true nature of neoplastic cyst will lead to an incorrct treatment strategy. Ultrasonography, computerized tomography and angiography were used to distingish these lesions, but diagnostic value of ERCP is in controversy. To evaluate the diagnostic value of ERCP in cystic lesions of the pancreas, we analysed 33 cases of pancreatic cystic lesions (pseudocyst 18 cases, retention cyst 3 cases and cystic, neoplasm l2 cases) between Apr. 1985 and June 1993. In 18 cases of pseudocysts, ERP findings were communication with cyst in 8 cases (44.4%), chronic pancreatitis in 8 cases (44.4%), obstruction in 4 cases (22.2%) and displscement of pancreatic duct in 2 cases (11.1%), and ERC findings, which were perfomed in 8 cases, showed cholangitis in 3 cases (37.5%), CBD stone in 2 cases (25%), mass effect in 1 case (12.5%) and normal in 2 cases (25%). There was no communication with the cyst and pancreatic duct, except two mucinous ductal ectasia, in 12 cases of cystic neoplasms, and the other findings were displacement of pancreatic duct in 4 cases (33.3%), obstruction in 2 cases (16.7%) and normal in 4 cases (33.3%). ERC findings of cystic neoplasm were almost normal (85.7%) except 1 case of cholangitis. In conclusion, ERCP findings of pseudocysts were communication with pancreatic duct, chronic pancreatitis and biliary tract abnormality. In contrast, ERCP findings of cystic neoplasms were displacement or obstruction of pancreatic duct without communication and chronic pancreatitis, and biliary tract abnormality were rare.
Angiography ; Biliary Tract ; Cholangiopancreatography, Endoscopic Retrograde* ; Cholangitis ; Dilatation, Pathologic ; Mucins ; Pancreas ; Pancreatic Cyst* ; Pancreatic Ducts ; Pancreatitis, Chronic ; Ultrasonography

Letterer-Siwe disease occurred in a 3 year 7 month old male child showing severe emaciation, hepatosplenomegaly, otitis media, hemorrhagic and impetiginous crusted patches on the body, and seborrheic dermatitis like skin rashes in the scalp. Also showed are severe anemia, thrombocytopenia, bronchopneumonia and multiple bony defects in skull. The child expired in a month after admission.
Anemia ; Bronchopneumonia ; Child ; Dermatitis, Seborrheic ; Emaciation ; Exanthema ; Histiocytosis, Langerhans-Cell* ; Humans ; Infant ; Male ; Otitis Media ; Scalp ; Skull ; Thrombocytopenia

No abstract available.
Cellulitis* ; Staphylococcus aureus* ; Staphylococcus*