• Maxillofacial Plastic and Reconstructive Surgery
• /
• v.32 no.6
• /
• pp.567-572
• /
• 2010

Intraoperative breakage of instruments can be occurred unexpectedly. To prevent damage of neighboring important anatomic structures and consequent complications, broken instruments should be removed as soon as possible. There have been several methods to remove broken instruments. One of them is the Carm fluoroscopy which is commonly used for locating metal foreign bodies. However, its application for removal of broken instruments in the oral and maxillofacial area is not common. In our experiences with the removal of two broken instruments in mandibular area, the newly developed dental mini C-arm was used to find broken instrument in soft tissue, because it gives real-time in situ information for the intraoperative location. We report two cases with broken instruments, a broken dental needle in the pterygomandibular space and a broken straight bur in the mandibular angle area. They were identified and could be removed safely using a dental mini C-arm.

• Restorative Dentistry and Endodontics
• /
• v.48 no.4
• /
• pp.38.1-38.10
• /
• 2023

Objectives: The aim of this study was to examine the use of hand or rotary files by pre-graduation (fourth- and fifth-year) and postgraduate students in endodontic treatments and to determine the incidence of file fracture and the management of cases with broken instruments. Materials and Methods: A total of 2,168 teeth undergoing primary endodontic treatment were included in this study. It was determined that 79 of these teeth resulted in broken tools. In the case of broken tools, the education level of the treating clinician, the tooth that was being treated, the canal and fracture level, the curvature of the tooth and the management of the broken instrument were recorded. Periapical radiographs of the patients were used to calculate curvature following the Schneider method. Results: There was no significant difference in the incidence of broken tools according to education level (p > 0.05). The incidence of file fracture in molar teeth (73.4%) was higher than in other teeth (p < 0.05). More files were broken in the mandibular molar MB canal (20.25%) and in the apical third of the canals (72.1%). The risk of instrument fracture was high in teeth with moderate (44.3%) and severe (38%) curvature canals. The management of apically broken (80%) files mostly involved lefting (p < 0.05). Conclusions: There was no statistically significant difference between fourth-year students, fifth-year students and postgraduate students in terms of instrument fracture.

• Korean Journal of Child Studies
• /
• v.13 no.1
• /
• pp.99-111
• /
• 1992

The purpose of this study is to investigate how the broken home influence the personality development. in comparison of the personal characters of the child of broken home with those of the child of normal home. The subjects of this study were III broken homes children and 183 normal homes children of 5th grade. sampled from elementary schools in Busan. The instrument used in this study was the character inventory prepared by Lee Sang Rho. etc. The result of the personality test was compared according to each variable(as follws)and the mean(M) standard deviation(SD) and T -test were obtained. The result of the analysis are as follows: 1. The child of normal homes is superior in superiority than the child of broken homes 2. The boys of mormal homes are superior in sociability than the boys of broken homes, boys of broken homes, but there was no outstanding difference between the girls of normal homes and the girls of broken homes. 3. In the case of extended family. there was no outstanding difference between the child of normal homes and the child of broken homes, but in the case of nuclear family. the child of normal homes is superior in sociability and superiority than the child of broken homes. 4. In the case of only child homes, there was no outstanding difference between the child of normal homes and the child of broken homes, but in the case of sibling child homes. the child of normal homes is superior in sociability and superiority than the child of broken homes.

• Journal of Korean Foot and Ankle Society
• /
• v.19 no.4
• /
• pp.181-187
• /
• 2015

Purpose: The purpose of this study is to retrospectively analyze the clinical results of screws and Kirschner wire (K-wire) fixation in patients with fracture dislocation of Lisfranc joint and the consequence of screw breakage. Materials and Methods: Sixty patients underwent Lisfranc joint open reduction and removal of internal fixators from January 2007 to December 2011. Forty-nine cases (81.7%) underwent operations with screw alone, and 11 cases (18.3%) underwent operations with both screws and K-wires. Type of internal fixators, duration of internal fixator removal, breakage of internal fixators and satisfaction with reduction were investigated. Additionally, American Orthopaedic Foot and Ankle Society (AOFAS) midfoot scales were analyzed. Results: The internal fixator was broken in 5 cases (8.3%). The average duration of instrument removal was 154 days in the non-broken screw group and 268.6 days in the broken screw group (p<0.05). The average AOFAS midfoot scale was 77.4 in the non-broken screw group and 74.2 in the broken screw group. The most commonly damaged portion was the first tarsometatarsal (Lisfranc) joint. Conclusion: Treatment with screws and K-wires was effective in patients with fracture dislocation of Lisfranc joint. The appropriate time for screw removal should be considered.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2002.07b
• /
• pp.853-856
• /
• 2002

Present. direct method x-ray conversion detector is studied by abroad medical instrument and country with amorphous Selenium. And we search the method for large area x-ray detector. Amorphous-Selenium based photoreceptor is widely used on the X-ray conversion materials. But amorphous-selenium based x-ray conversion detector is broken by high voltage and leakage defect point. In this paper, We investigated top-electrode distance rate to improve defect point and high voltage broken. The result to appoint to made large area x-ray conversion detector with base data.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.9 no.4
• /
• pp.219-227
• /
• 2014

Natural disasters such as a ground collapse and a landslide have broken out due to the climate change of the Korea and the reckless expansion of cities and roads. The climate changes and the reckless urbanization have made the ground weak. Thus, it is important to keep a close eye on the highly weakened landslide and to prevent its natural disasters. In order to prevent these disasters, this paper presents a system of recognizing the road slide condition by measuring the displacements using laser scanner instrument. The previous system of monitoring the road slide has some problems as inaccurate recognition due to using only images from a camera, or expensive system such as artificial satellites and aircraft systems. To solve this problem, our proposed system uses the 3D range data from the laser scanner for measuring the accurate displacement of the road slide and optical flows from the Lucas-Kanade algorithm for recognizing the road slide in the image.

• Restorative Dentistry and Endodontics
• /
• v.45 no.2
• /
• pp.14.1-14.7
• /
• 2020

Objective: The aim of this study was to perform a comparative evaluation of the effectiveness of ultrasonic tips versus the Terauchi file retrieval kit (TFRK) for the removal of broken endodontic instruments. Materials and Methods: A total of 80 extracted human first mandibular molars with moderate root canal curvature were selected. Following access cavity preparation canal patency was established with a size 10/15 K-file in the mesiobuccal canals of all teeth. The teeth were divided into 2 groups of 40 teeth each: the P group (ProUltra tips) and the T group (TFRK). Each group was further subdivided into 2 smaller groups of 20 teeth each according to whether ProTaper F1 rotary instruments were fractured in either the coronal third (C constituting the PC and TC groups) or the middle third (M constituting the PM and TM groups). Instrument retrieval was performed using either ProUltra tips or the TFRK. Results: The overall success rate at removing the separated instrument was 90% in group P and 95% in group T (p > 0.05) The mean time for instrument removal was higher with the ultrasonic tips than with the TFRK (p > 0.05). Conclusion: Both systems are acceptable clinical tools for instrument retrieval but the loop device in the TFRK requires slightly more dexterity than is needed for the ProUltra tips.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.54 no.4
• /
• pp.366-374
• /
• 2009

To determine the optimum operating conditions of the indented cylinder length grader based on varietal characteristics, broken rice removal capabilities were measured on the milled rice of 41 varieties at different conditions consisted of 3 types of indented cylinders with different indent-opening diameters and 3 different collecting-angles of broken rice. The broken rice removal capabilities were swayed by the indent's opening diameter and depth as well as the angle of the collecting trough of broken rice on the point of instrument, and by the kernel length and width as well as 1000 grain weight of milled rice on the point of rice variety. When the angle of broken rice collecting-trough reached to near the horizontal center line of the indented cylinder on the direction of upward turning side, which was referred $0^{\circ}$ in this paper, the amount of rice collected in trough increased, whereas the loss of head rice also increased. Considering the removal rate of broken rice as well as loss of head rice, it was thought that the suitable angle of trough for broken rice collecting was located $5^{\circ}$ to $15^{\circ}$ depending on varietal characteristic and indent opening diameter. It was thought that 4.2 mm or more of indent opening diameter was recommendable for the rice varieties having heavier 1000 grain weight than 22.3g, as well as larger sizes than 2.9 and 5.2 mm in width and length of rice kernel, respectively; 3.8 mm for the small-sized thin kernels, and a proper diameter between 3.8 and 4.2 mm for short to middle kernels. The varieties with relatively shorter length compared to width of kernel were more difficult to separate the broken rice than the opposite ones. For effective separation of that, it seems that some specific indent shapes such as wider opening and shallow depth etc. are required. When the broken rice content were excessively high, wider diameters of indent openings than specified sizes were thought to be the better.

• The Korean Nurse
• /
• v.29 no.4
• /
• pp.73-88
• /
• 1990

This study was done in order to identify symptoms of grief and patterns of coping in mothers of chronically ill children. Nurses, as health professionals, must understand helpful coping methods for mothers who have chronically ill children. Based on this knowledge, nurses can develop appropriate nursing intervention strategies, and so help the mothers to develop effective ways of coping and give support to mothers with chronically ill children in process of coping with this grief. The research questions guiding this research were: 1. what type of grief does the mother have at the time of child's diagnosis and at present\ulcorner 2. what are the problems confronting the mother 3. what are the coping patterns of the mother\ulcorner 4. is there a difference according to child's diagnosis in the mother's grief and coping pattern\ulcorner The subject for this study were obtained by taking a convenience sample of 120 mothers with a chronically ill child. Interviews took place in four medical school hospitals and one medical center in Seoul from March 19th to May 16th 1990. The tools used in this study were Mcfarlan's(1983), Grief contents, Folkman & Lazarus(1983), Ways of Coping and Hymovich's (1983) the Chronicity Impact and Coping Instrument. The findings were as follows; 1. Grief items had a maximum score of three points. The highest item scrores at the time of diagnosis, were in order, heart broken, talkative, and could not do anything, at the present, 'talkative', 'heart broken' and 'busy myself with other things'. 2. The problems confronting the mothers were 'worry about ill child's future', 'her responsibilities in taking care of the ill child.' 3. Most of the mothers used similar ways of coping, that is 'problem focused coping', 'detachment', 'wishful thinking', 'seeking social support" and 'focusing on the positive and hardly any of them used 'tension reduction'. 4. There was a sinificant difference in coping methods according to the childs diagnosis, leukemia, cancer hemophillia and nephrotic syndrome. The most frequently used coping method was detachment, especially for the mother of the child with. 5. At the time of diagnosis there was a positive correlation between the level of grief and the coping method of detachment and seeking social support.

• Journal of the Korean Society for Library and Information Science
• /
• v.46 no.2
• /
• pp.5-28
• /
• 2012

Great Books of the Western World(GBWW) is a series of books published in 1952 by Encyclopaedia Britannica to present the famous works in 54 volumes. The series is now in its second edition and contains 60 volumes. A syntopicon compiled by M. Adler is a two-volume index, published as volumes 2 and 3 of GBWW. The syntopicon was coined specifically for this undertaking, which means a collection of topics. Syntopicon lists, under each idea, is where every occurrence of the concept can be located in the collection's famous works. This study aims to analyze the structure and utility of topic index, syntopicon in GBWW. The syntopicon consists of 102 chapters on the 102 ideas. Each chapter is broken down into five distinct sections: the introduction, an outline of topics, references, cross-references, and additional readings. The syntopicon can serve as a reference book, as a selection tool of book to be read, instrument of liberal education, instrument of discovery and research, syntopical reading of other reading material, development tool of convergent education, and analysis tool of works.