• Journal of the korean academy of Pediatric Dentistry
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• v.33 no.3
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• pp.534-547
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• 2006

Ectopic eruption and impaction of canines is a frequently encountered clinical problems. The incidence of impaction ranges between 1-3%. The cause of canine impaction can be the result of localized factors or can be a polygenic multifactorial inheritance and associated with other dental anomalies. The general dentist and pediatric dentist should know how to properly diagnose and manage potential disturbances in the eruption of maxillary canine. Diagnosis of impacted canine at age 8-10 years can significantly reduce serious ramifications, including surgical exposure and orthodontic traction as well as root resorption of the lateral incisors. Extraction of primary canine would be one of the method to prevent the impaction. The surgical procedure should be designed to minimize the destruction of periodontal tissue of impacted canine. Closed eruption technique is thought to be optimal method of surgical exposure compared with other methods. An overview of the incidence, sequela as well as the surgical periodontal, and orthodontic consideration in the management of impacted canine was presented.

• Journal of the Korean Arthroscopy Society
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• v.16 no.1
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• pp.98-103
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• 2012

The repair technique of rotator cuff tear has been markedly developed in recent years. When the natural history of rotator cuff tear was followed, the size of rotator cuff tear increased with time. The fatty infiltration which would come at the later period of rotator cuff tear and the rotator cuff tear arthropathy which would be occurred after massive rotator cuff tear may be the important factors in predicting the prognosis of rotator cuff tear or determining the timing of surgery. Because moderate supraspinatus fatty infiltration appeared an average of 3 years after onset of symptoms, the repair of rotator cuff tear was recommended to be performed before that. And if there was massive rotator cuff tear with cuff tear arthropathy, it was recommended that the rotator cuff repair should be performed before the occurrence of the narrowing of acromiohumeral interval. The techniques of arthroscopic rotator cuff repair were mainly the single row repair and the double row repair. The former is good in view of time consuming and cost, but the latter is superior in view of biomechanics. To maintain the benefit in biomechanics of double row technique and reduce the time of surgery, the suture-bridge technique was invented and widely used recently. There are several modified techniques in arthroscopic suture-bridge technique according to the characteristics of rotator cuff tear.

• Pediatric Infection and Vaccine
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• v.27 no.1
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• pp.69-76
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• 2020

Recurrent bacterial meningitis is the reappearance of two or more episodes of meningitis caused by a different or same organism after an intervening period of full convalescence. Predisposing factors for recurrent bacterial meningitis include immunodeficiency and developmental and traumatic anatomical defects. Therefore, careful evaluation of children with recurrent meningitis is essential. We report the case of a patient with a skull base abnormality who had suffered from four events of bacterial meningitis between 8 and 17 years of age. He experienced another event of bacterial meningitis at the age of 21, without undergoing correction for the anatomical defect. Streptococcus agalactiae was identified in the patient's blood and cerebrospinal fluid culture. Afterwards, he underwent surgical treatment for a meningioma; this meningioma was strongly suspected as the cause of the recurrence.

• Journal of Chest Surgery
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• v.35 no.2
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• pp.87-93
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• 2002

Background: Predicting the important role of intercellular adhesion molecule-1 expression on the acute ischemia-reperfusion injury, we set out to demonstrate it by assessing the degree of expression of ICAM-1 after warm ischemia-reperfusion in canine unilateral lung ischemia model. Material and Method: Left unilateral lung ischemia was induced by clamping the left hilum for 100 minutes in seven adult mongrel dogs. After reperfusion, various hemodynamic pararmeters and blood gases were analyzed for 4 hours, while intermittently clamping the right hilum in order to allow observation of the injured Ieft lung function. The pulmonary venous blood was collected serially to measure TNF- and cICAM-1 level. After 4 hours of reperfusion, the lung tissue was biopsied to assess cICAM-1 expression, and to measure tissue malondialdehyde(MDA) and ATP level. Result: The parameters including arterial oxygen partial pressure, pulmonary vascular resistance and tissue MDA and ATP level suggested severe lung damage. Serum TNF-$\alpha$ level was 8.76$\pm$2.37 ng/ml at 60 minutes after reperfusion and decreased thereafter. The cICAM-1 level showed no change after the reperfusion during the experiment. The tissue cICAM-1 expression was confirmed in 5 dogs. Conclusion: The increase of TNF-$\alpha$ Ievel and expression of tissue ICAM-1 were demonstrated after ischemia reperfusion injury in canine lung model.

• Journal of Chest Surgery
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• v.39 no.2 s.259
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• pp.111-116
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• 2006

Background: Perforation of the esophagus is a deadly injury that requires expert management for survival. The mediastinal contamination with microorganisms, gastric acid, and digestive enzymes results in a mediastinitis that is often fatal if untreated. Material and Method: Between January 1990 and June 2004, 38 patients with esophageal perforation were treated in our hospital. Retrospective review of these cases has been performed. Result: There were 28 males and 10 females. The mean age was 43.84$\pm$18.89 years (range $1{\~}73$ years). Spontaneous rupture was found in $34\%$ of perforations, iatrogenic perforation in $32\%$ and traumatic perforation in $34\%$. Perforation occurred in the cervical esophagus in 8 cases, thoracic esophagus in 29 and abdominal esophagus in 1. In the cervical esophageal perforation, managements were primary closure in 8 and drainage in 2. In the thoracic esophageal perforation, managements were primary closure in 14, resection in 3 and conservative management in 12. The mortality rate was $25\%$ in cervical esophageal perforation and $34.5\%$ in thoracic esophageal perforation. We revealed risk factor of esophageal perforation to be peropertaive septic condition (p=0.005). Conclusion: Most important risk factor of esophageal perforation was preoperative septic condition. Preoperative prompt and aggressive preoperative treatment may improve the survival rate of esophageal perforation.

• Korean Journal of Environmental Biology
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• v.37 no.4
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• pp.467-473
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• 2019

The amputation of body parts of wild animals can affect their activities in the wild and the behavior of mothers raising their cubs can cause behavioral characteristics in their offspring. In 2017, an Asiatic black bear was caught in a snare at the Jirisan National Park and had a right forefoot amputation. It was released into the wild the same year and gave birth to two cubs. The seasonal analysis of the behavioral rites of five females who gave birth in the same year as this individual showed specific home ranges, activity altitudes, and movement distances compared to other populations. Physical disabilities in the mother could lead to difficulties in food activity, hibernation, and cub-rearing, but the bear's maternal instincts helped to overcome difficulties in the wild and ensure the cubs' survival. It also became a special experience in the process of promoting the restoration of Asiatic black bears at Jirisan National Park. Although the Asiatic black bear's cubs, which grew up in difficult conditions compared to other populations, are not currently causing problems, continuous monitoring will help determine the success of the disabled mother cub-rearing study. Furthermore, these case studies will be used to establish long-term management directions and plans for conflicts with people from various perspectives.

• Journal of Oral Medicine and Pain
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• v.38 no.1
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• pp.87-95
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• 2013

Osteoarthritis (OA) of the temporomandibular joint (TMJ) is a severe form of temporomandibular disorders (TMDs), presenting gradual breakdown of articular cartilage and subchondral bone by the functional load sustained to exceed the physiologic tolerance of the joint. In such a joint loaded, offensive bioactive materials such as matrix degrading proteins, cytokines, and free radicals increase in concentration to shift the tissue response in the joint to degeneration from regeneration or remodeling. Recently, it has been issued that obesity can play an offensive role in pathogenesis of OA in a metabolic way. Adipokines released by adipose cells are present at higher concentration in the arthritic joint and joints of obese individuals. However, because of conflicting data reported, further scientific study should be performed to elucidate the practical role of adipokines in pathogenesis of TMJ OA. As far as the clinical signs and symptoms of TMJ OA are not much different from those of other forms of TMD and any definitive treatment modality to control directly the bone resorptive activity is not available yet, the treatment of TMJ OA should be directed to reduce the physical load and enhance the physiologic tolerance of the joint by means of conservative treatment such as physical therapy, medication, and occlusal splint therapy for sufficient period and, if needed after that, supplementary surgical procedure such as intra-articular injection, arthrocenthesis, and arthroscopic surgery that have turned out to be effective to control OA signs and symtpoms. Enthusiastic reassurance and motivation for patients to control behaviors for themselves to reduce unnecessary functional load in daily life is very important for the joint to reach to more favorable orthopedic stability of the TMJ more quickly, guaranteeing more successful management TMJ OA.

• Journal of the korean academy of Pediatric Dentistry
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• v.34 no.1
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• pp.162-168
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• 2007

Impaction of the maxillary central incisor may cause social, esthetic, and functional problems in children. There are various means of treatment for the inverted maxillary central incisor, such as extraction, surgical opening followed by orthodontic traction surgical repositioning or intra-alveolar autotransplantation prior to extraction. In this case, we surgically repositioned the inverted maxillary central incisor to normal semi-erupted position in a 5-year-old boy The developmental stage of the inverted tooth was Nolla's 6.5, which indicates formation of less than one third of the root. After surgical reposition, we did follow-up for 21 months, expecting spontaneous growth Unfortunately, poor prognosis was noted further root was not observed. Such failure seems to originate from possible injury on Hertwig's epithelial root sheath by surgical trauma. We performed surgical repositioning to retain the tooth instead of extraction. However, arrest of root development occurred which is one of the critical complications. In order to increase the success rate of the surgical reposition procedure, minimal surgical trauma is required as well as selection of adequate indication and decision of proper time of treatment considering the stage of root development.

• Journal of Korean Ophthalmic Optics Society
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• v.20 no.2
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• pp.219-228
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• 2015

Purpose: The current study was performed to compare the difference in binocular visual function depending on variable background colors at near work. Method: Fifty four adults (18 males, 34 females) who consented to the present study and had no ocular disease, ocular surgery history, strabismus and amblyopia with normal binocular vision were participated into this study. The subjects were asked to read the novels with black letter printed on white, red, green and blue background for 15 min. Then, their heterophoria, AC/A ratio, near point of convergence, accommodation facility, relative accommodation and vergence were measured before and after reading. The difference of measurements were compared. Result: Overall heterophoria was tended to decrease with regardless of background color. AC/A ratio showed a tendency of increase after reading the novels with all backgrounds except white background. Near point of convergence was significantly increased compared to before reading at all background color. Accommodative facility of dominant and non-dominant eyes were also significantly increased after reading however, binocular accommodative facility showed a tendency of decrease. Negative relative accommodation also decreased at all background colors however, the change of positive relative accommodation was not significantly different. In case of vergence, there was significant difference in break point of far BO and recovery point of far BI by the wavelength of background color. Conclusions: From the results, it was known there is convergence change depending on the wavelength of light even though same amount of accommodation and convergence is required when doing near work for certain period. Thus, it can be suggested that the adjustment of the near working environment which perception of various color was required, should be conducted according to the main wavelength.

• Progress in Medical Physics
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• v.17 no.1
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• pp.40-46
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• 2006

Hepatoma is one of 3 most common malignancies in Korea, the survival rate is not improved since last decades because of delayed diagnosis and limited treatment conditions. Radiation was one of treatment options but the impact on the survival is not remarkable. High dose exposure to target area was suggested for improved effect but low tolerance dose of normal liver tissue is the main limited factor. IMRT is the advanced form of 3DCRT, for focusing high dose on target with minimal dose to surrounding normal tissues. Motion of the tumor by respiration, cardiac pulsation and peristalsis is the main treatment harrier of IMRT for treatment of hepatoma patients. Development of QA technique for acceptable geometrical uncertainties and dose error on target volume is essential for IMRT in clinical treatment but proper QA technique is not yet developed. This study compared the verification film dosimetry with measured dose in phantom and calculated dose in planning computer on exactly same conditions of patient treatments. Within 3% dose differences between 3 groups were confirmed. We suggest that our verification QA technique is easy, economic, iterative and acceptable in clinical application for advanced hepatoma patients.