Sterilization has received much attention in orthodontic practices over the past several years. The present study was undertaken to investigate the effects of sterilization on the physical properties of orthodontic pliers-AEZ, Unitek, and Dentronix ligature cutters. This study was designed to examine the tips of ligature cutters before and after 200 and 400 sterilization cycles using the Bowmar RHT-1000, the Dentronix DDS-5000, and the Eschmann SES-2000. The tip surface and the fracture surface were observed with a scanning electron microscope. The microstructure was observed with an optical microscope. The hardness test was carried out with the mic개-Vickers hardness tester and the Rockwell C Scale hardness tester. The chemical composition was analyzed by energy dispersive X-ray spectrometer. The results of this study were as follows : 1. The number and the size of corrosion products on the tip surface and the proportion of cleavage planes in fractured specimen increased, but the hardness of the tip decreased in proportion to sterilization cycles. From these observations, it was considered that mechanical properities decreased in proportion to sterilization cycles. 2. The number and the size of chromium carbides increased in proportion to sterilization cycles. Coarse microstructure decreased mechanical properities. 3. The AEZ and Unitek ligature cutters were Fe-Cr stainless steels, but the Dentronix ligature cutter was Co-Cr alloy. There were many differences among manufactures, but the chemical composition was .not changed after sterilization cycles. 4. The tip edge of ligature cutter used in a clinic revealed microcracks with the SEM observation. Clinical experience confirmed that ligature cutters were gradually degraded by sterilization.
Background : Pulmonary Langerhans cell histiocytosis forms part of a spectrum of diseases that are characterized by a monoclonal proliferation and infiltration of organs by Langerhans cells. Several organ systems may be involved in Langerhans cell histiocytosis, including the lungs, bone, skin, pituitary gland, liver, lymph nodes and thyroid. Pulmonary histiocytosis X represents 2.8% of interstitial lung disease. Here we present the clinical, radiological, therapeutic aspects of pulmonary histiocytosis X. Method : Fourteen cases of biopsy-proven pulmonary histiocytosis X patients who were diagnosed in Seoul National University Hospital during the period from January 1990 to December 1998 were analyzed retrospectively. Result : There were 12 men and 2 women in this study. The initial presenting symptoms were dyspnea, cough, chest pain, which was associated with the pneumothorax, and chest radiography abnormalities. Only 8 patients (57%) were smokers. There were 5 patients with extra-pulmonary histiocytosis (pituitary, bone, skin). Eight patients had received the chemotherapy. There were no mortalities and only one patient experienced an aggravation of symptom during the follow-up period. Conclusion : In contrast to previous reports from other countries, the patients with pulmonary histiocytosis X in this study presented with several different clinical characteristics, such as a male predominance, relatively low smoker's rate, and a better prognosis.
Hwang, Tae Hyok;Wang, Tae Hyun;Cho, Hyung Lae;Kim, Keun Young
Journal of the Korean Arthroscopy Society
/
v.15
no.2
/
pp.92-98
/
2011
Purpose: We describe a all-arthroscopic technique for decompression of spinoglenoid ganglion cyst and present our clinical results for this procedure. Materials and Methods: From March 2006 to June 2009, eight patients (7 males, 1 female; mean age 40.6 years; range: 21~61) were included who underwent arthroscopic decompression of spinoglenoid ganglion cyst. The most common symptoms were vague shoulder pain and external rotation weakness, which lasted 6.4 months (range: 3~8) on average. Five of eight patients were noted abnormalities on electromyographic (EMG) examination to have suprascapular nerve neuropathy and magnetic resonance imaging (MRI) showed spinoglenoid ganglion cysts in all eight patients and the cyst size was 2.6 cm (range: 1.8~3.6). Labral pathology was identified intraoperatively in all patients and the cysts were decompressed by the posterosuperior capsulotomy under arthroscopic control and labral repair with suture anchors was performed in six patients. Results: The average clinical outcome scores including Constant and Murley, Simple shoulder test (SST) all improved significantly at the time of the final follow-up and there were no complications resulting from the procedures. All patients including the patients with abnormal EMG study recovered strength on isokinetic strength testing. Follow-up MRI scans were performed on all patients at a mean of 5.2 months postoperatively (range: 3~12) revealed complete resolution of the cysts and no evidence of recurrences were seen at an average of 18 months (range: 12~26) of follow-up. Conclusion: Arthroscopic decompression of spinoglenoid ganglion cyst effectively restores patient function and all patients in this study showed improvement in their postoperative MRI findings. Arthroscopic decompression is also useful in the appropriate treatment for labral pathology and may contribute to decreased risk of cyst recurrence.
Purpose : A study was done to assess the incidence and classification of congenital urinary tract anomalies detected by antenatal ultrasonogram. Methods : We reviewed 558 cases of urinary tract anomaly which were detected by antenatal ultrasonogram and postnatally confirmed between June 1989 and May 2002. We investigated the incidence and classified congenital urinary tract anomalies by review of medical records, antenatal and postnatal radiologic studies retrospectively. Results : In 558 cases of congenital urinary tract anomalies, 292 cases of hydronephrosis were found and the most common. Another anomalies were composed of 65 cases of multicystic dysplastic kidney, 32 cases of hydroureteronephrosis, 31 cases of duplication of kidney, 25 cases of renal agenesis, 21 cases of simple renal cyst, 20 cases of polycystic disease, 13 cases of ureterocele, 11 cases of renal hypoplasia, 10 cases of horseshoe kidney, 9 cases of vesicoureteral reflux, 8 cases of posterior urethral valve, 7 cases of bladder diverticulum, 6 casts of megaureter, 5 cases of ectopia, 2 cases of megacystis, and 1 case of medullary cystic disease. In 82 of the 558 cases, there were two or more combined urinary tract anomalies. Associated diseases other than urinary tract were observed in 13 cases, of which the congenital heart disease was the most common. Conclusion : The congenital urinary tract anomaly is frequently found and diverse during the antenatal ultrasonography. The multicenter study is needed to investigate precise incidence and distribution of each anomalies in general population.
Keum Ki Chang;Park Hee Chul;Seong Jinsil;Chang Sei Kyoung;Han Kwang Hyub;Chon Chae Yoon;Moon Young Myoung;Kim Gwi Eon;Suh Chang Ok
Radiation Oncology Journal
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v.20
no.2
/
pp.123-129
/
2002
Purpose : The purpose of this study 띤as to determine the potential role of three-dimensional conformal radiotherapy (3D-CRT) in the treatment of primary unresectable hepatocellular carcinoma. The preliminary results on the efficacy and the toxicity of 3D-CRT are reported. Materials and Methods : Seventeen patients were enrolled in this study, which was conducted prospectively from January 1995 to June 1997. The exclusion criteria included the presence of extrahepatic metastasis, liver cirrhosis of Child-Pugh classification C, tumors occupying more than two thirds of the entire liver, and a performance status of more than 3 on the ECOG scale. Two patients were treated with radiotherapy only while the remaining 15 were treated with combined transcatheter arterial chemoembolization. Radiotherapy was given to the field including the tumor plus a 1.5 cm margin using a 3D-CRT technique. The radiation dose ranged from $36\~60\;Gy$ (median; 59.4 Gy). Tumor response was based on a radiological examination such as the CT scan, MR imaging, and hepatic artery angiography at $4\~8$ weeks following the completion of treatment. The acute and subacute toxicities were monitored. Results : An objective response was observed in 11 out of 17 patients, giving a response rate of $64.7\%$. The actuarial survival rate at 2 years was $21.2\%$ from the start of radiotherapy (median survival; 19 months). Six patients developed a distant metastasis consisting of a lung metastasis in 5 patients and bone metastasis in one. The complications related to 30-CRT were gastro-duodenitis $(\geq\;grade\;2)$ in 2 patients. There were no treatment related deaths and radiation induced hepatitis. Conclusion : The preliminary results show that 3D-CRT is a reliable and effective treatment modality for primary unresectable hepatocellular carcinoma compared to other conventional modalities. Further studies to evaluate the definitive role of the 3D-CRT technique in the treatment of primary unresectable hepatocellular carcinoma are needed.
Background: Deep vein thrombosis (DVT) is a serious disease that causes life-threatening pulmonary embolism and chronic venous insufficiency. Anticoagulation is the standard therapy for DVT. However, the results of standard anticoagulation for treating DVT have been disappointing, so endovascular treatment is commonly performed nowadays. The aim of this study was to evaluate the efficacy of an endovascular procedure for treating patients with DVT. Material and Method: We retrospectively evaluated the clinical data of 29 DVT patients who underwent an endovascular procedure between December 2006 and July 2008. We compared the results of the 29 patients with the results of another 45 patients who were treated with only aspirin and heparin. Result: The patient’s mean age was 55.4 years in the intervention group and 53.7 years in the control group. DVT occurred more frequently in the females. Catheter-directed thrombolysis was performed in 22 patients (75.8%). Aspiration thrombectomy was performed in 18 patients (62%) and a endovascular stent was placed in 25 patients (86.2%). Fifteen patients (51.7%) underwent percutaneous insertion of a retrievable IVC filter for the prevention of pulmonary embolism. In the control group, thirty nine patients (86.7%) were treated with low-molecular heparin, and seven patients (15.6%) who were contraindicated for warfarin were treated with aspirin. No bleeding complications occurred during thrombolysis or anticoagulation. We analyzed the statistical data according to recurrence of DVT and the incidence of post-thrombotic syndrome (PTS) during the follow-up period. The intervention group had a significantly lower incidence of PTS (p-value=0.008), but they had the same result as the control group for the recurrence of DVT. In addition, death from the DVT did not occur in the intervention group. Thus, we obtained better clinical outcomes in the intervention group as compared to those in the anticoagulation only group. Conclusion: Endovascular procedures are effective alternative modalities, as compared to systemic anticoagulation, for the treatment of DVT. But more studies are needed to determine the specific indications and to validate the long-term efficacy of endovascular procedures for the treatment of DVT.
Kim, Ji-Young;Kim, Kyung-A;Lee, Yeon-Kyung;Ko, Sun-Young;Shin, Son-Moon;Han, Byung-Hee
Neonatal Medicine
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v.18
no.1
/
pp.117-123
/
2011
Purpose: Congenital intrahepatic portosystemic shunts are rare disease and clinically asymptomatic shunts may be detected by chance on ultrasonogram before and after birth. We studied clinical course, treatment and prognosis of congenital intrahepatic portosystemic shunt at prenatal or neonatal period. Methods: Medical records of 8 patients which were diagnosed in intrahepatic portosystemic shunt in Cheil General Hospital from 2006 through 2010 were reviewed retrospectively. Results: Eight patients with congenital intrahepatic portosystemic shunts were identified. Six patients were diagnosed at prenatal radiological screening, including three cases of intrauterine growth restriction and two cases of preterm baby. One case with increased serum ammonia underwent coil embolization. In four cases including one case that presented elevated direct bilirubin, shunts were closed spontaneously within 11th month after birth. Two patients were diagnosed on abdominal sonogram after birth because of elevated direct hyperbilirubinemia, all of whom presented intrauterine growth restriction. Closure of shunts was confirmed during 4th month to 6th month. Conclusion: Congenital intrahepatic portosystemic shunts are clinically asymptomatic mostly and spontaneous closure is expected within 2 years age. But occasionally they have severe complication, so clinical and radiological observation is needed. Specially in cases of intrauterine growth retardation without evident cause, the possible diagnosis of congenital intrahepatic portosystemic shunts should be considered and prenatal and postnatal examination should be performed. When prenatal diagnosis is made, fetal wellbeing should be monitored periodically until spontaneous closure of shunts.
Purpose: The purpose of this study is investigation of clinical and functional outcomes in homogeneous group with positive culture after arthroscopic management for pyogenic knee arthritis and analysis of factors affecting those outcomes. Materials and Methods: Thirty-two patients with positive culture after arthroscopic management were included. Mean follow-up period was 41.6 months. Clinical evaluation included death related to infection, recurrence, time to normalize erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP), duration of administration of intravenous antibiotics and readmission. Radiographic evaluation was performed according to Kellgren and Lawrence. The prevalence of total knee arthroplasty was investigated and functional evaluation included modified Lysholm, Tegner activity and Korean version of the Western Ontario and McMaster Universities (K-WOMAC) score. Results: Staphylococcus aureus was identified in 21 patients. Time to normalize ESR and CRP was 78.0 and 67.6 days, respectively. Two patients died while there were six recurrences and five readmissions. Rate of recurrence was significantly high in patients with chronic renal failure (P=0.034) and incidence of readmission was associated with higher radiographic grade of osteoarthritis and rate of reoperation (P=0.032 and P=0.006, respectively). At the final follow-up, radiographic grade worsened in 21 patients and was associated with those at first visit. Five arthroplasties were performed. Average modified Lysholm score, Tegner activity score and K-WOMAC score were 53.5, 2.7, 44.2 points, respectively. Conclusion: The severity of osteoarthritis on final radiographs was associated with those at first visit. Patients with higher grade of osteoarthritis at first visit showed higher incidence of readmission and those with chronic renal failure demonstrated higher chances of recurrence.
Purpose: To identify the damage of the articular cartilage and analyze the clinical results of the partial medial meniscectomy. Materials and Methods: From January 2001 to December 2004, forty-eight patients in the degenerative arthritis and medial meniscal tear of knee who undertook arthroscopic partial meniscectomy and were able to keep pace with the times follow-up for more than 3 years were enrolled in this study. Six cases were men and 42 were women, and the mean age was 55.7 years (40~78 years). The patients were classified into two groups according to the Outerbridge grade. Grade I and II were classified into group 1 and grade III and IV into group 2. Group 1 included 30 cases and group 2 included 18 cases. The result were analyzed according to the Tapper & Hoover classification and Lysholm knee scoring scale. And we measured the distance of medial joint space in standing anteroposterior (AP) view of both sides at the pre-operative and the last follow-up. Results: According to the Tapper & Hoover classification, 28 cases were excellent, 7 cases good, 8 cases fair, and 5 cases poor. Among group 1, 25 cases were excellent, 2 cases good, 2 cases fair, 1 case poor. However, among group 2, 3 cases were excellent, 5 cases good, 6 cases fair, 4 cases poor. Average Lysholm knee score was improved from 62.4 preoperatively to 94 postoperatively in group 1, and from 58 preoperatively to 77.9 postoperatively in group 2. The joint space narrowing showed no statistically significant difference in both knees standing AP view. Conclusion: The arthroscopic partial meniscectomy for a patient with the degenerative articular cartilage was an effective treatment. However, we could not satisfy the results, in cases of Outerbridge grade III and IV. In grade III and IV, the partial meniscectomy was not aggravated the cartilage damage.
The Journal of Korean Orthopaedic Ultrasound Society
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v.6
no.1
/
pp.1-9
/
2013
Purpose: The purpose is to perform objective evaluation for rotator cuff using ultrasonography and validate factors influencing cuff integrity as well as efficacy of follow-up ultrasonography after unreamed antegrade intramedullary nailing for humerus fracture. Materials and Methods: Seventeen patients with an average age of $55.7{\pm}18.6$ years underwent antegrade intramedullary nailing for humerus fracture and follow-up ultrasonography of shoulder joint. Mean follow-up period was $43.5{\pm}32.2$ months. Intraoperative evaluation for preoperative cuff tear was performed, of which four cuffs were repaired by single row repair technique. Clinical evaluation included visual analogue scale (VAS), range of motion, Korean Shoulder Scoring System (KSS) and American Shoulder and Elbow Society (ASES) score. Ultrasonographic evaluation was performed on cuff integrity and protrusion of proximal nail tip as well. Radiographic evaluation included time to union, protrusion of proximal nail tip and migration of proximal interlocking screw which could affect shoulder joint function. Results: Mean VAS at last follow-up was $1.65{\pm}1.84$ points. Range of motion showed forward flexion of $137.0{\pm}33.5^{\circ}$, external rotation of $43.5{\pm}12.7^{\circ}$ and internal rotation of $16.4{\pm}2.0^{\circ}$ while KSS score and ASES score were $79.6{\pm}20.7$ and $83.7{\pm}17.0$ points, respectively. Bone union was demonstrated in all cases and average time to union was $3.4{\pm}1.3$ months. Migration of proximal interlocking screw was shown in 6 cases (35%). On ultrasonographic evaluation, there were normal in 8 (47%), weaving in 4 (24%), partial tear in 5 cases (29%), but no complete tear. Protrusion of proximal nail tip was demonstrated in 8 cases (47%) on plain radiographs whereas in 11 cases (65%) on ultrasonography and was associated with increasing age (p=0.038). Ultrasonographic weaving and partial tear was associated with protrusion of proximal nail tip (p=006), but not with repair of preoperative tear (p>0.05). Conclusion: Because weaving and partial tear on ultrasonography originated from protrusion of proximal nail tip, careful insertion of nail and meticulous repair of cuff during operation lead to stable fixation with satisfactory recovery of shoulder function follow-up ultrasonography can be a useful tool for evaluating protrusion of nail tip and rotator cuff tear, of which diagnosis is difficult on plain X-ray after antegrade intramedullary nailing for humerus fracture.
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