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*

No abstract available.
Baculoviridae* ; Bombyx* ; Coinfection*

PURPOSE: Several recent studies have reported the benefits of tubeless percutaneous nephrolithotomy (PNL). Postoperatively, tubeless PNL patients have an indwelling ureteral stent placed, which is often associated with stent-related morbidity. We have performed totally tubeless (tubeless and stentless) PNL in which no nephrostomy tube or ureteral stent is placed postoperatively. We evaluated the safety, effectiveness, and feasibility of totally tubeless PNL. MATERIALS AND METHODS: From March 2008 to February 2012, 57 selected patients underwent standard or totally tubeless PNL. Neither a nephrostomy tube nor a ureteral stent was placed in the totally tubeless PNL group. We compared patient and stone characteristics, operation time, length of hospitalization, analgesia requirements, stone-free rate, blood loss, change in creatinine, and perioperative complications between the standard and totally tubeless PNL groups. RESULTS: There were no significant differences in preoperative patient characteristics, postoperative complications, or the stone-free rate between the two groups, but the totally tubeless PNL group showed a shorter hospitalization and a lesser analgesic requirement compared with the standard PNL group. Blood loss and change in creatinine were not significantly different between the two groups. CONCLUSIONS: Totally tubeless PNL appears to be a safe and effective alternative for the management of renal stone patients and is associated with a decrease in length of hospital stay.
Analgesia ; Creatinine ; Hospitalization ; Humans ; Kidney Calculi ; Length of Stay ; Nephrostomy, Percutaneous ; Postoperative Complications ; Stents ; Ureter

PURPOSE: Several recent studies have reported the benefits of tubeless percutaneous nephrolithotomy (PNL). Postoperatively, tubeless PNL patients have an indwelling ureteral stent placed, which is often associated with stent-related morbidity. We have performed totally tubeless (tubeless and stentless) PNL in which no nephrostomy tube or ureteral stent is placed postoperatively. We evaluated the safety, effectiveness, and feasibility of totally tubeless PNL. MATERIALS AND METHODS: From March 2008 to February 2012, 57 selected patients underwent standard or totally tubeless PNL. Neither a nephrostomy tube nor a ureteral stent was placed in the totally tubeless PNL group. We compared patient and stone characteristics, operation time, length of hospitalization, analgesia requirements, stone-free rate, blood loss, change in creatinine, and perioperative complications between the standard and totally tubeless PNL groups. RESULTS: There were no significant differences in preoperative patient characteristics, postoperative complications, or the stone-free rate between the two groups, but the totally tubeless PNL group showed a shorter hospitalization and a lesser analgesic requirement compared with the standard PNL group. Blood loss and change in creatinine were not significantly different between the two groups. CONCLUSIONS: Totally tubeless PNL appears to be a safe and effective alternative for the management of renal stone patients and is associated with a decrease in length of hospital stay.
Analgesia ; Creatinine ; Hospitalization ; Humans ; Kidney Calculi ; Length of Stay ; Nephrostomy, Percutaneous ; Postoperative Complications ; Stents ; Ureter

PURPOSE: To describe the surgical treatment of the complex dorsal metacarpophalangeal dislocations and its results, emphasizing on the modified volar approach with A1 pulley release. MATERIALS AND METHODS: We experienced 6 cases of dorsal dislocation of the metacarpophalangeal joint. We performed open reduction with the modified volar approach described by Eaton and Dray. Postoperatively posteroanterior and lateral radiographs of the index finger metacarpophalangeal joint and metacarpophalangeal joint range of motion was followed. RESULTS: One case with a large osteochondral fracture was operated with volar and doral approach both. Overall end results were good without any significant restriction of motion and stability of the fingers. CONCLUSION: Modified volar approach with A1 pulley release is an excellent method for complex dorsal metacarpophalangeal dislocations without osteochondral fracture.
Benzodiazepines ; Dislocations ; Fingers ; Metacarpophalangeal Joint ; Range of Motion, Articular

Chylothorax or chylous ascites are rare manifestations of liver cirrhosis. We report a rare case of simultaneous chylothorax and chylous ascites in a patient with hepatitis B virus-related liver cirrhosis. A 76-year-old woman was referred to our hospital with a pleural effusion on her right side. She had no history of recent medical procedures, trauma or tumor. There was no evidence of mass or thoracic duct obstruction in a computed tomography scan. Pleural fluid and ascites were confirmed as chylothorax and chylous ascites by chemistry analysis. Despite thorough conservative care, there was no improvement. Pleurodesis was planned, but hepatic encephalopathy developed suddenly and she did not recover.
Aged ; Ascites ; Chemistry ; Chylothorax* ; Chylous Ascites* ; Female ; Hepatic Encephalopathy ; Hepatitis B ; Humans ; Liver Cirrhosis ; Pleural Effusion ; Pleurodesis ; Thoracic Duct

PURPOSE: The purpose of this article is to review the current status of dental caries diagnosis using cone beam computed tomography (CBCT). MATERIALS AND METHODS: An online PubMed search was performed to identify studies on caries research using CBCT. RESULTS: Despite its usefulness, there were inherent limitations in the detection of caries lesions through conventional radiograph mainly due to the two-dimensional (2D) representation of caries lesions. Several efforts were made to investigate the three-dimensional (3D) image of lesion, only to gain little popularity. Recently, CBCT was introduced and has been used for diagnosis of caries in several reports. Some of them maintained the superiority of CBCT systems, however it is still under controversies. CONCLUSION: The CBCT systems are promising, however they should not be considered as a primary choice of caries diagnosis in everyday practice yet. Further studies under more standardized condition should be performed in the near future.
Cone-Beam Computed Tomography ; Dental Caries

Malaria is a worldwide febrile illness with high morbidity and mortality. High fever, jaundice, hemolysis, and hepatosplenomegaly are usual symptoms and signs of malaria, whereas retinal hemorrhage is an unusual finding. Retinal hemorrhage has been known to be one of the clinical manifestations in severe Plasmodium falciparum infection, especially in children developing cerebral malaria. However, retinal hemorrhage can occur in adult patients with severe parasitemia, shizontemia, anemia and may occur in malaria infections caused by other Plasmodium species, because it is due to dense parasitemia in deep vascular beds. A case of Plasmodium vivax malaria with retinal hemorrhage has not been reported as yet. We report a Plasmodium vivax malaria patient with retinal hemorrhage, who presented with severe schizontemia and anemia.
Adult* ; Anemia ; Child ; Fever ; Hemolysis ; Humans ; Jaundice ; Malaria ; Malaria, Cerebral ; Malaria, Vivax* ; Mortality ; Parasitemia ; Plasmodium ; Plasmodium falciparum ; Plasmodium vivax ; Retinal Hemorrhage* ; Retinaldehyde*

Old post burn contractures on feet still remain challenging problem for reconstructive surgeon. A 43-year-old male visited Hallym University Sacred Heart Hospital with the complain of foot deformity and difficulties in shoe fitting. His right 4th and 5th toes were inverted at dorsal foot. We released the contracture of 4, 5th metatarsophalangeal joint and lengthened extensor tendon by Z-plasty, and covered the resultant defect with the anterolateral thigh flap. The flap was successful and the deformity was corrected. As there have been few reports on reconstruction of foot dorsum, especially on post burn extension contractures in the toes, we report a rare case of contracture release and coverage by free flap.
Adult ; Burns* ; Congenital Abnormalities ; Contracture* ; Foot ; Foot Deformities ; Free Tissue Flaps* ; Heart ; Humans ; Male ; Metatarsophalangeal Joint ; Shoes ; Tendons ; Thigh ; Toes*

PURPOSE: The purpose of this study is to evaluate the radiologic features and clinical utility of ultrasonography and mammography in cases of gynecomastia. MATERIALS AND METHODS: This study involved 40 men inwhom gynecomastia had been pathologically diagnosed by surgical incision. In 21 cases, a retrospective analysis of ultrasonographic and mammographic findings was performed. RESULTS: Causative factors of gynecomastia among the 40 pathologically-proven cases were idiopathic or pubertal in 33 cases, related to male hormone deficiency in three cases and to chronic liver disease in four. Bilateral involvement was seen in 14 cases, and unilateral involvementin 26 ; among unilateral cases, right side was involved in 10 cases, and the left side in 16. Mammographically, asubareolar discoid lesion was present in 12 cases, diffuse increased breast density was seen in five cases and dendritic marginated subareolar lesion without microcalcification in one. Ultrasonographically, a round smooth marginated low echogenic lesion in the subareolar region was seen in five cases, a diffuse hyperechogenic pattern without definite mass in two cases and an ill defined low echogenic lesion in one. CONCLUSION: The male breast is small, so in cases of gynecomastia, ultrasonography is an effective diagnostic modality. Mamography will, however, be helpful in the detection of microcalcification in cases of gynecomastia seen on sonography.
Breast ; Gynecomastia* ; Humans ; Liver Diseases ; Male ; Mammography ; Retrospective Studies ; Ultrasonography