• Restorative Dentistry and Endodontics
• /
• v.40 no.1
• /
• pp.44-49
• /
• 2015

Objectives: This study compared the ability of several techniques to remove calcium hydroxide (CH) from the root canal and determined the influence of CH residues on the accuracy of the electronic apex locator. Materials and Methods: Root canals of 90 human maxillary lateral incisors with confirmed true working length (TWL) were prepared and filled with CH. The teeth were randomly assigned to one of the experimental groups according to the CH removal technique (n = 14): 0.9% saline; 0.9% saline + master apical file (MAF); 17% ethylenediamine tetraacetic acid (EDTA); 17% EDTA + MAF; 5.25% sodium hypochlorite (NaOCl); 5.25% NaOCl + MAF. Six teeth were used as negative control. After CH removal, the electronic working length was measured using Root-ZX (Morita Corp.) and compared with TWL to evaluate Root-ZX accuracy. All specimens were sectioned longitudinally, and the area of remaining CH (CH) and total canal area were measured using imaging software. Results: The EDTA + MAF and NaOCl + MAF groups showed better CH removal than other groups (p < 0.05). Root-ZX reliability to prevent overestimated working length to be > 85% within a tolerance of ${\pm}1.0mm$ (p < 0.05). There was strong negative correlation between amount of CH residues and EAL accuracy (r = -0.800 for ${\pm}0.5mm$; r = -0.940 for ${\pm}1.0mm$). Conclusions: The mechanical instrumentation improves the CH removal of irrigation solutions although none of the techniques removed the dressing completely. Residues of CH medication in root canals affected the accuracy of Root-ZX adversely.

• The Journal of Advanced Prosthodontics
• /
• v.16 no.3
• /
• pp.139-150
• /
• 2024

PURPOSE. The purpose of this diagnostic study was to assess the accuracy and time efficiency of a digital method to draw the denture foundation extension outline on preliminary casts compared with the conventional technique. MATERIALS AND METHODS. A total of 28 preliminary edentulous casts with no anatomical landmarks were digitized using a laboratory scanner. The outlining of the entire basal seat of the denture was performed on preliminary casts and digitized. Casts with no extension outline were digitized and outlines were drawn using software (DWOS, Straumann). The accuracy of the extension outlined between both techniques was evaluated in the software (GOM Inspect; GOM GmbH) by file superimposition. Specificity and sensitivity tests were applied to measure accuracy. The paired t-test (95% CI) was used to compare the mean total area and the working time. RESULTS. The accuracy ranged from 0.57 to 0.92. The buccal and labial frenulum showed a lower value in the maxilla (0.57); while the area between the retromolar pad and buccal frenulum (0.64) showed a lower score in the mandible. The maxillary denture foundation and the working time for both arches were significantly longer for the digital method (P < .001). CONCLUSION. The denture foundation extension outline exhibited a sufficiently excellent accuracy for the digital method, except for the maxillary anterior region. However, the digital method required a longer working time.

• Journal of rehabilitation welfare engineering & assistive technology
• /
• v.6 no.2
• /
• pp.71-76
• /
• 2012

The purpose of the present study was to compare and analyze differences in job satisfaction and quality of life in relation to the use of movement assisters among workers with severe and slight external physical disabilities and to analyze the effect of job satisfaction on the quality of life of disabled persons who use movement assisters. First, severely disabled persons who used movement assisters showed higher degrees of satisfaction with their work content, working environments, working hours, possibilities for development, communication, and human relations. On the other hand, slightly disabled persons who used movement assisters showed higher degrees of satisfaction only with their working environments. Second, severely disabled persons who used movement assisters perceived a higher quality of life in the areas of family, residence, and work. Slightly disabled persons who used movement assisters perceived a higher quality of life only in the area of family. Third, workers with external physical disabilities who used movement assisters had positive effects on their quality of life arising from job satisfaction in relation to income, job stability, working environments, working hours, possibilities for job development, communication, and human relations that is, a higher job satisfaction was correlated with a higher perceived quality of life.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.29 no.2
• /
• pp.109-126
• /
• 2018

Librarians, who provide the public with library services at public libraries, are employees whose jobs are often require emotional labor. The emotional labor of librarians working at public libraries can result in stresses caused by the discrepancy between the library's emotional requirements and the librarian's personal emotions, which may influence organizational effectiveness, such as organizational commitment and job satisfaction. In that, this study intends to examine the influence of emotional labor on the organizational commitment and job satisfaction of librarians working at public libraries. To do so, based upon the conceptual underpinning through literature reviews of librarians working at public libraries and emotional labor, this study constructs a theoretical framework of organizational commitment and job satisfaction of librarians. Using a questionnaire survey method, this study surveys 238 public library staff from 33 public libraries in the Seoul metropolitan area, statistically examines the response through the SPSS20 statistical package, and analyzes the relationship between and among the variables. Based on the analysis, discussion on the influence of the emotional labor on organizational commitment and job satisfaction of librarians working at public libraries follows.

• Journal of Ocean Engineering and Technology
• /
• v.34 no.3
• /
• pp.217-226
• /
• 2020

An offshore plant is an offshore platform that can process oil and gas resources in rough seas with a poor working environment. Moreover, it is a complex structure with different types of offshore facilities and a large amount of outfitting that connects different offshore installations. In particular, an enormous amount of various piping materials is installed in a relatively narrow space, and thus, the difficulty of working is relatively high compared to working in ships or ground plants. Generally, when the 3D detailed design is completed, an offshore plant piping process is carried out at the shipyard with ISO 2D fabrication drawings and ISO 2D installation drawings. If a worker wants to understand the three-dimensional piping composition in the working area, he can only use three-dimensional viewers that provide limited functionality. As offshore plant construction progresses, correlating work with predecessors becomes more complicated and rework occurs because of frequent design changes. This viewer function makes it difficult to identify the 3D piping structure of the urgently needed part. This study deals with the process support method based on a system using a 3D simulator to improve the efficiency of the piping process. The 3D simulator is based on the Unity3D engine and can be simulated by considering the classification and priority of 3D models by the piping process in the system. Further, it makes it possible to visualize progress information of the process. In addition, the punch content can be displayed on the 3D model after the pipe inspection. Finally, in supporting the data in relation to the piping process, it is considered that 3D-simulator-supported piping installing could improve the work efficiency by more than 99% compared to the existing method.

• Restorative Dentistry and Endodontics
• /
• v.37 no.1
• /
• pp.24-28
• /
• 2012

Objectives: The aim of this study was to test the hypothesis, that the effectiveness of irrigation in removing smear layer in the apical third of root canal system is dependent on the depth of placement of the irrigation needle into the root canal and the enlargement size of the canal. Materials and Methods: Eighty sound human lower incisors were divided into eight groups according to the enlargement size (#25, #30, #35 and #40) and the needle penetration depth (3 mm from working length, WL-3 mm and 9 mm from working length, WL-9 mm). Each canal was enlarged to working length with Profile.06 Rotary Ni-Ti files and irrigated with 5.25% NaOCl. Then, each canal received a final irrigation with 3 mL of 3% EDTA for 4 min, followed by 5 mL of 5.25% NaOCl at different level (WL-3 mm and WL-9 mm) from working length. Each specimen was prepared for the scanning electron microscope (SEM). Photographs of the 3mm area from the apical constriction of each canal with a magnification of ${\times}250$, ${\times}500$, ${\times}1,000$, ${\times}2,500$ were taken for the final evaluation. Results: Removal of smear layer in WL-3 mm group showed a significantly different effect when the canal was enlarged to larger than #30. There was a significant difference in removing apical smear layer between the needle penetration depth of WL-3 mm and WL-9 mm. Conclusions: Removal of smear layer from the apical portion of root canals was effectively accomplished with apical instrumentation to #35/40 06 taper file and 3 mm needle penetration from the working length.

• Journal of Korean Public Health Nursing
• /
• v.29 no.3
• /
• pp.551-564
• /
• 2015

Purpose: Th study is to explore the working conditions and factors related to job satisfaction of nurses in long-term care facilities for the elderly. Methods: A total of 127 nurses working long-term care facilities, from June to November 2014, completed questionnaires. Face to face interviews were conducted. The questionnaire consists of a total of 32 questions, including 5 questions related to general characteristics, 15 questions related to working conditions, and 12 questions related to job satisfaction(likert scale of 1 to 5). Results: The majority of nurses were employed in institutional care facilities, in urban area, and in privately owned facilities. On average, employed nurses worked 170.7 hours per month. Only 40.9% of them got more than two million won for their monthly salary. They were satisfied with the nature and worth of their work and the workplace relationship, but not with their wages and promotion opportunity 40.2% of nurses reported satisfaction with job. In multiple logistic regression analysis, age was a statistically significant influencing factor on general job satisfaction. Conclusion: The findings suggest that policies must be to improve nurses' working conditions, for wages, and to support them with education and training for skills development.

• Journal of Technologic Dentistry
• /
• v.12 no.1
• /
• pp.15-21
• /
• 1990

This research was to investigate and study on 92 Dental Technicians who had had some experience of working or being employed at dental craft-shops or craft-rooms in Seoul area and had transferred to other types of occupation, with regard to their reasons for changing their profession. For an approach to the study, some questionnaires and interview including 3 aspects of in quiriesmental, economic and social backgrounds-were administered, and major findings are as follows ; 1. The ages in which transferring to other kinds of job happened occurred mostly from 20 to 30(78.26%) an a group of subjects whose ages ranged from 20 to 30 years old. And, with regard to their experience of working or being employed at dental craft-shops or craftrooms, the transfer of their profession to the other kinds mosty happened in a group of subjects(94.56%) whose experience of working in the dental field is less than 4 years. 2. The reason of transfer with reference to the mental background was mostly mattered in a group that expressed "Excessive Work Duties"(34.78%), and most lowly mattered in a group of subjets who had "Certain Relations with Dentists"(8.70%). Thus, it appeared that the biggest reason of transfer by the mental background was, due to the excessive duty work, not to have Sufficient time to be usualized by dental technicians for their own purpose. 3. With reference to the economical background, a group that declared there was "No Wage Standards in Ratio to Their Labor" was the most in the separation rate as shown 45.56%. And, a group suspecting "No Guarantee for Their Living after Retirement" Showed a separation rate, 9.78%. In other words, the reason for transfer was that they did not receive due wage according to their amount of labor. 4. With reference to the social background, a group making a subject for no good working environments or conditions had a separation rate, 41.30%, which was the most among others, and a group with a subject of "The Rarity of Employment because of Excessive Supply of Dental Technicians" had the rate, 10.87%, which was the lowest. This meant that the major cause of transfer by the social background was a phenomenon for dental technicans to escape from unclean working places.

• Korean Journal of Occupational Health Nursing
• /
• v.23 no.3
• /
• pp.123-133
• /
• 2014

Purpose: The purpose of this study was to investigate the relationships among self-efficacy, collective efficacy, job satisfaction, and organizational commitment of nurses working in general hospitals. Methods: Data were collected from 239 nurses working in five general hospitals of a local area by self-reported questionnaires. The collected data were analyzed with descriptive statistics, t-test, ANOVA, Pearson's correlation, and hierarchial multiple regression. Results: Self-efficacy, collective efficacy, job satisfaction, and organizational commitment showed significantly positive correlations. Hierarchial multiple regression analysis showed that self-efficacy was the main factor of affecting job satisfaction, which explained 14.3% of the variance for the nurses' job satisfaction together with collective efficacy and weekly working time. In addition, the primary factor of affecting organization commitment was self-efficacy, which accounted for 17.2% of the variance for the nurses' organizational commitment together with hospital size and shift work. Conclusion: Self-efficacy and nursing working condition such as working time or hospital size contributed to the job satisfaction and organizational commitment and collective efficacy contributed to the job satisfaction. Therefore, the strategies for improving self and collective efficacy should be considered. Further study is also needed to investigate the concept of collective efficacy and its' measurement, and the relationship between collective efficacy and organizational commitment.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.9
• /
• pp.2471-2477
• /
• 2009

The purpose of this study was to analyze dental technician's job environment and job stress level and to examine its correlation. 180 dental technicians in Seoul, Incheon, and Chungnam area were selected. Survey was carried out from April 6, 2009 to May 20, 2009 by using self-administered questionnaire. The following are the analytical results in the collected data. 1. As a result of analyzing the research subjects' working environment level, there was significant difference in the item of health(P<0.05). The average in the working environment was indicated to be high with 1.53. 2. As a result of analyzing the research subjects' job-stress causing level, there was no significant item in all the variables. The average of job stress was indicated to be high with 3.44. 3. As for correlation between working environment and job stress, most of variables were indicated to have reverse correlation, thereby having been shown that the worse working environment leads to the more job stress.