• The Journal of Korean Academy of Prosthodontics
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• v.37 no.6
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• pp.825-834
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• 1999

Recently, various implant cylinders were supplied. especially received gold cylinders, cast cylinders produced from premade gold and plastic cylinders and plastic cylinders. This study measured and compared precise fit produced when using conventional gold and plastic cylinders. The comparative fit of lapped and non-lapped castings made from plastic pattern was examined. The implant/abutment interface fit was evaluated by scanning electron microscopy(SEM) for each of four cylinders. The following results were obtained: 1. The case of plastic cylinder showed $9.67{\pm}1.50{\mu}m$ gap when Steri-Oss fixture was connected. 2. The case of lapped casting made from plastic cylinder showed $3.01{\pm}2.81{\mu}m$ gap when Steri-Oss fixture was connected. 3 The case of gold/plastic cylinder showed $9.80{\pm}1.68{\mu}m$ gap when Steri-Oss fixture was connected. 4. The case of gold cylinder showed ${5.47{\pm}2.43\mu}m$ gap when Steri-Oss fixture was connected. 5. In case of each cylinder which was connected with Steri-Oss fixture, the size of gap was showed less in the order of the case of gold/plastic cylinder, the case of plastic cylinder, the case of gold cylinder and the case of lapped casting made from plastic cylinder As results of this study, the use of premade gold cylinder offers an advantage over plastic pat-terns in precise fit. When plastic patterns are used, polishing of implant cylinder components should provide precise fit.

• Archives of Plastic Surgery
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• v.50 no.5
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• pp.463-467
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• 2023

Madelung's disease (MD) is a rare disease characterized by diffuse, nonencapsulated, multiple fat masses in different areas of the body. In this case report, we present a case of MD in Asia and its management. A 66-year-old man with a history of hypertension presented with massive growth of soft tissue around the neck, breasts, upper back, and lower abdomen. Preoperative magnetic resonance imaging revealed remarkably hypertrophic fat tissue around the neck and anterior chest was wall, which consistent with the diagnosis of MD. Multiple linear incisions were made on the neck and 763, 186, 635 g of posterior, right, and left fat tissues were excised, respectively. A single wide, transverse incision was done to excise 1,072 g of fat from the upper back. Masses of both breasts were excised, preserving the inferior pedicle, weighing 1,086 (right) and 1,164 g (left). The recovery was optimal and the patient was discharged without complications. In this case, we excised the adipose masses as much as possible and improved contour and symmetry. However, the fat infiltrations in the patient were diffusely distributed, making total fat excision difficult. This rare case report may help in managing patients with MD.

• Archives of Plastic Surgery
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• v.33 no.2
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• pp.225-232
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• 2006

The aim of this study is to evaluate the clinical competence of medical student using short case test items. Development of short case test items with definition of an assessment of subject, choice of clinical stations sampling, identification of components of clinical competence to be evaluated, and assessment of practicability and results exploitation. For the last three years 28, 48 and 30 topics were developed annually. Among them 20, 23 and 23 topics were selected. About 50 students were examined annually. The mean score was 72.7, 57.1, 64.3 respectively. The mean preparation time of the students for the examination was 9.8 hours. About 60% of the students prepared the test in small group activity. Our experience suggests that short case test items be feasible for evaluation of student learning in Plastic Surgery. This method should be considered as a useful tool to assess medical student's competence or even an examination for board certification.

• Archives of Plastic Surgery
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• v.38 no.5
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• pp.663-668
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• 2011

Purpose: A modified free thenar flap was designed for coverage of volar finger defect with constant innervation using the palmar cutaneous branch of the median nerve. After clinical application of this flap, sensory results were evaluated in 6 cases. Methods: Patients were selected who have volar soft tissue defect with or without fingertip defect. The six cases of the innervated free thenar flap were performed since September 2009, and sensory outcomes were evaluated by the Semmes-Weinstein monofilament and two-point discriminator at four and half month after the surgery. Results: The Semmes-Weinstein Monofilament test revealed 3 cases showed 2.83, 1 case showed 3.61, 1 case showed 4.31 and 1 case showed 4.56. The static two-point discrimination test revealed 1 case showed 4 mm, 1 case showed 6 mm, 2 cases showed 9 mm, and 2 cases showed over 15 mm. The moving two-point discrimination test revealed 1 case showed 3 mm, 1 case showed 4 mm, 1 case showed 5 mm, 1 case showed 7 mm, and 2 cases showed over 15 mm. The donor sites showed no significant limitation of the thumb and neuroma formation. Conclusion: The innervated free thenar flap showed good sensory outcomes as a sensate free flap in a short time after surgery. It can be an option for coverage of volar finger defects that requires sensation.

• Archives of Plastic Surgery
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• v.32 no.6
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• pp.773-776
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• 2005

An unusual case is presented as bilateral, complete digital duplication of the hand in a 32-year-old man. Radiographic evaluation showed complete duplication of intact phalanges and metacarpal bones in both hands. Although polydactyly of the hand is reported to occur among approximately 1 in 1000 live births, most of these malformations are rudimentary skin tags. Complete postaxial polydactyly is uncommon; it occurs in approximately 0.014% of all live births. The main goal of the surgical treatment is to establish adequate function and appearance. This case reports the preoperative evaluation and management of bilateral postaxial type III duplication of the fingers.

• Journal of Welding and Joining
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• v.10 no.1
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• pp.43-51
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• 1992

The plastic zone formed around a notch tip is important in analyzing the fracture toughness of structures and particularly weld cracks existed in the weld HAZ (heat affected zone) which produces local plastic deformation at the crack tip. Therefore, in order to analyze the fracture toughness in weld HAZ, it is necessary to investigate the new fracture toughness parameter $K_{c}$ $^{*}$ and critical plastic strain energy $W_{p}$ $^{c}$ according to the shape and size of the plastic zone. 1) If the temperature corresponding to $K_{c}$ $^{*}$=130kg-m $m^{-3}$ 2/ is determined, transition temperature $T_{tr}$ the magnitude of plastic zone size, and heat input change depending on the fracture toughness. The blunted amounts of the parent and weld HAZ show mild linear variation until .delta.=0.4mm and then increase very steeply there after. 2) The relation between the plastic strain energy( $W^{p}$ ) and transition temperature( $T_{*}$tr) in parent metal is more sensitive than that of weld HAZ. However, the plastic strain energy depends on the transition temperature, and thus the yield stress, .sigma.$_{ys}$ becomes an important parameter for plastic strain energy. 3) The critical plastic strain energy( $W_{p}$ $^{c}$ ) absorbed by the plastic zone at the notch tip indicated in case of parent metal: 60J/mm, in case of heat input(20KJ/cm): 75J/mm, in case of heat input(30KJ/cm); 50J/mmJ/mm.

• Archives of Craniofacial Surgery
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• v.13 no.1
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• pp.1-3
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• 2012

The case series is a descriptive study that follows a group of patients who have a similar diagnosis or who are undergoing the same procedure and is the most prevalent type of research in the field of plastic surgery. Results of case series can generate hypotheses that are useful in designing further studies, including randomized controlled trials or a prospective cohort study. However, no causal inferences should be made from case series regarding the efficacy of the investigated treatment. The authors provide a guide to the design and report on the case series.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.5
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• pp.1158-1167
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• 1995

In this study, the dynamic instabilities of a beam, subjected to periodic short impulsive loading, are investigated using simple 2-DoF beam model. The behaviors of beam model whose axial motions are constrained are studied for the case of elastic and elastic-plastic behavior. In the case of elastic behavior, the chaotic responses due to the periodic pulse are identified, and the characteristics of the behavior are analysed by investigating the fractal attractors in the Poincare map. The short-term and long-term responses of the beam are unpredictable because of the extreme sensitivities to parameters, a hallmark of chaotic response. In the case of elastic-plastic behavior, the responses are governed by the plastic strains which occur continuously and irregularly as time increases. Thus the characteristics of the response behavior change continuously due to the plastic strain increments, and are unpredictable as well as the elastic case.

• Archives of Plastic Surgery
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• v.51 no.4
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• pp.423-431
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• 2024

Proteus syndrome (PS) is an exceptionally uncommon genetic disorder that has been documented in only approximately 250 cases in the literature spanning the past four decades. It is characterized by a disproportionate, asymmetric overgrowth of all types of tissues, provoked by a somatic activating mutation in serine/threonine protein kinase 1. We report a case of PS in a two-year-old female patient with the following clinical features: unilateral overgrowth of connective tissue in the right buttock and right foot, where multiple surgeries were performed to achieve a desirable aesthetic outcome and ensure psychological comfort of the young patient. The insights provided by this case underscore the pivotal role of obtaining pleasing aesthetic outcomes in the surgical management of untreatable genetic disorders, with the aim of nurturing psychological contentment in affected children.

• Archives of Plastic Surgery
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• v.51 no.3
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• pp.290-294
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• 2024

Giant congenital nevi, especially on the head and neck, pose a challenge for plastic surgeons. This requires extensive experience in detailed planning, combining different techniques, and selecting appropriate materials for reconstruction. There have been reports of using a tissue expander, serial resection method, and full-thickness skin grafts for this type of nevus. However, the best way to completely remove a giant congenital nevus is endless. In this article, we would like to present a case of a left hemifacial giant congenital nevus in which we used multiple tissue expansion to fully replace the nevus, along with some of our modification techniques.