• The Journal of the Korean dental association
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• v.48 no.12
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• pp.893-918
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• 2010

This article is purposed of reviewing the development history of Japanese dental devices and instrument, and their related advertisement activities during the Japanese colonized period in Korea in early 20th century. Japanese dental devices and instrument were redesigned to accommodate their ergonomic shape above the simple imitation, and it implies the excessive desires brought them frustrations. The tragic earthquake on Sep. l, 1923, medical insurance law enforcement on Jan. 1, 1927, celebration of "Cavity prevention Day" started on Jun. 4, 1928, and the attack of Manchuria and China by Japan after 1931, all of these historical incidents become the preliminary requirement for the development of dental devices. On Nov. 1, 1937, Japanese government started to control dental materials, driving the campaigns for excluding foreign products and encourging the use of local products. In 1939, Nakajima dental manufacturers used this political and social atmosphere on their advertisement as saying "Our Nakajima's products have no compromise with the short raw materials, but only commitment to our quality". Since after 1940, the price and supply have been strongly under control, and the control group was appeared to manage all of supply and distribution of raw materials, regular price system, and specifications. At last, the Japanese national power were devastated in its production and distribution capacities, and get to the frustrated period. The main advertised dental devices and instruments in Korea during the Japanese colonized period were 1) dental chair, unit and cabinet, 2) dental x-ray, 3) compressors, 4) dental needles, 5) small instrument and carryon medical(emergency) kit, 6) oral hygiene and pyorrhea alveolaris, infrared rays, sunlight lamp, ultrashort wave treatment devices, 7)crown former, electric furnace, casting machine, articulator, electric lathe, and laboratory equipments, etc.

• The korean journal of orthodontics
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• v.17 no.2
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• pp.289-297
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• 1987

For the comparisons of dental archs and crowdings between musical wind instrument players groups and non-wind instrument players groups, 64 male wind instrument players and 31 non-wind instrument players group were selected. The results of the measurements were as follow. 1 Upper intercanine widths, upper basal arch widths, lower basal arch widths were statistically significant between musical wind instrument players groups (Class A, Class B) and non-wind musical instrument players group. 2 The mean value of upper intercanine width m Class A ($373{\pm}2.3mm$) was greater than than in Class B ($362{\pm}17mm$) and non-wind musical instrument players group($360{\pm}16mm$) 3 The mean value of lower basal arch width m Class B ($422{\pm}25mm$) was greater than that in non wind instrument players group ($395{\pm}28mm$). 4 The differences in the mean values of crowdings between Class A and Class Band non-wind instrument players group were not statistically significant.

• Journal of dental hygiene science
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• v.22 no.2
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• pp.108-114
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• 2022

Background: Students in the department of dental hygiene are exposed to injections and sharp instruments during clinical practice. Therefore, it is necessary to develop measures for a safe practice environment. This study aimed to investigate dental stabbing accidents caused by dental instruments during clinical practice among students in the department of dental hygiene and suggest appropriate preventative measures. Methods: This study was conducted from May 1 to June 30, 2016, with students in the department of dental hygiene located at several universities in Seoul and Gyeonggi area. The study included 339 participants. A frequency analysis was performed to determine the general characteristics of dental infection control. A cross-analysis was conducted to identify the relationship between dental infection control education, stabbing accident prevention education, and treatment after stabbing accidents with a dental instrument. Results: Among the participants, 81.1% received dental infection control education and 66.4% received stabbing accident prevention education. Only 50.9% received hepatitis B vaccinations. Conclusion: Dental infection control education and stabbing accident prevention education were shown to be effective in preventing dental instrument stabbing in students. However, post-accident processing, such as reporting to upper management and medical treatment after the accident, was insufficient. Therefore, it is necessary to present a treatment flowchart for dealing with stab accidents in clinical practice for students in the department of dental hygiene and strengthen education.

• Restorative Dentistry and Endodontics
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• v.38 no.2
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• pp.93-97
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• 2013

During root canal preparation procedures, the potential for instrument breakage is always present. When instrument breakage occurs, it leads to anxiety of the clinician and as well as a metallic obstruction of the canal which hinders further cleaning and shaping. Separated instruments must always be attempted for retrieval and if retrieval is not possible bypass should be tried. With the increased use of nickel-titanium (NiTi) instruments the incidence of separated instruments has increased. A considerable amount of research has been done to understand the various factors related to the fracture of NiTi instruments to minimize its occurrence. This paper presents a review of the literature regarding the fracture of NiTi instruments and also describes a case report showing the use of a modified 18-guage needle and cyanoacrylate glue to retrieve a separated NiTi instrument from the mesiolingual canal of a mandibular first molar.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.41
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• pp.21.1-21.3
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• 2019

Background: Treatment planning the correction of a transverse maxillary occlusal plane cant often involves a degree of qualitative "eyeballing", with the attendant possibility of error in the estimated judgement. A simple chair side technique permits quantification of the extent of asymmetry and thereby quantitative measurements for the correction of the occlusal plane cant. Methods: A measuring instrument may be constructed by soldering the edge of a stainless steel dental ruler at 90° to the flat surface of a similar ruler. With the patient either standing in natural head position, or alternatively seated upright in the dental chair, and a dental photographic retractor in situ, the flat under-surface of the horizontal part of this measuring instrument is placed on a unilateral segment of a bilateral structure, e.g. the higher maxillary canine orthodontic bracket hook. The vertical ruler is held next to the contralateral canine tooth, and the vertical distance measured directly from the canine bracket to the flat under-surface of the horizontal part of the measuring instrument. Results: This vertical distance quantifies the overall extent of movement required to level the maxillary occlusal plane. Conclusions: This measuring instrument and simple chair side technique helps to quantify the overall extent of surgical levelling required and may be a useful additional technique in our clinical diagnostic armamentarium.

• Journal of Korean society of Dental Hygiene
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• v.16 no.3
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• pp.401-407
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• 2016

Objectives: The purpose of the study was to investigate the correlation between critical thinking disposition and self-efficacy in dental hygiene students. Methods: This is a cross-sectional study. A self-reported questionnaire was completed by 486 dental hygiene students in for colleges Jellabukdo from March to June, 2016. The study instrument included general characteristics of the subjects, critical thinking disposition, and self-efficacy. The instrument for critical thinking disposition was adapted from Yoon and consisted of intellectual zeal/curiosity, prudence, self-confidence, systemicity, intellectual impartiality, sound skepticism, and objectivity. Each question was measured by Likert 5 point scale. Cronbach's alpha was 0.73 in the study. The instrument for self-efficacy was adapted from Kim and consisted of self-efficacy confidence, self-regulation efficacy, and task difficulty choice using Likert 5 point scale. Cronbach's alpha was 0.73 in the study. Results: The correlation between critical thinking disposition and details of each area showed a strong correlation. The strongest positive correlation in passion was 0.721 for curiosity and critical thinking disposition overall(p<0.01). Conclusions: It is necessary to develop the program for critical thinking disposition and self-efficacy in the dental hygiene students.

• Journal of Korean society of Dental Hygiene
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• v.15 no.1
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• pp.81-89
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• 2015

Objectives: The purpose of the study is to investigate the effect of values on major satisfaction in dental hygiene students. Methods: The subjects were 214 dental hygiene students in Seoul and Gyeonggi-do who filled out the self-reported questionnaire after receiving informed consents from January 20 to February 15, 2014. Except incomplete answers, 187 data were analyzed using PASW Statistics 18.0 for Scheffe post hoc test, Pearson correlation coefficient, hierarchical regression analysis, independent sample t-test, and one-way ANOVA. The questionnaire consisted of general characteristics of the subjects and values. General characteristics consisted of gender, age, grade, school record, major choice motivation, and the influencing person to choose the major. The instrument for values was modified from Shin based on MILOV(Multi-Item Measures Of Values) and two professors of dental hygiene verified the validity of the instrument. Instrument for values consisted of 7 questions of values for self-respect, 6 questions of relation oriented values, 5 questions of emotion oriented values, and 5 questions of values for others measured by Likert 5 scale. Cronbach's alpha was 0.769 in the study. The instrument for major satisfaction was modified from Na based on Program Evaluation Survey of Illinois University and two professors of dental hygiene verified the validity of the instrument. Major satisfaction consisted of 7 questions of general satisfaction, 5 questions of consciousness satisfaction, 5 questions of curriculum satisfaction and 3 questions of relation satisfaction measured by Likert 5 scale and Cronbach's alpha was 0.887 in the study. Results: Values of self-respect, relationship orientation and grade had significant influence on general satisfaction, while values of self-respect, relationship orientation and gender had significant influence on consciousness satisfaction. Values of relationship orientation, grade and school record had significant influence on curriculum satisfaction. Grade showed significant influence on relationship satisfaction. Conclusions: Values of self-respect and relationship orientation are the most important factors in dental hygiene students. The guidance for professional career and major satisfaction can be accomplished through the values of self-respect and relationship orientation.

• Restorative Dentistry and Endodontics
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• v.46 no.4
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• pp.49.1-49.8
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• 2021

Objectives: To evaluate the fracture incidence of Reciproc R25 instruments (VDW) used during non-surgical root canal retreatments performed by students in a postgraduate endodontic program. Materials and Methods: From the analysis of clinical record cards and periapical radiographs of root canal retreatments performed by postgraduate students using the Reciproc R25, a total of 1,016 teeth (2,544 root canals) were selected. The instruments were discarded after a single use. The general incidence of instrument fractures and its frequency was analyzed considering the group of teeth and the root thirds where the fractures occurred. Statistical analysis was performed using the χ² test (p < 0.01). Results: Seven instruments were separated during the procedures. The percentage of fracture in relation to the number of instrumented canals was 0.27% and 0.68% in relation to the number of instrumented teeth. Four fractures occurred in maxillary molars, 1 in a mandibular molar, 1 in a mandibular premolar and 1 in a maxillary incisor. A greater number of fractures was observed in molars when compared with the number of fractures observed in the other dental groups (p < 0.01). Considering all of the instrument fractures, 71.43% were located in the apical third and 28.57% in the middle third (p < 0.01). One instrument fragment was removed, one bypassed, while in 5 cases, the instrument fragment remained inside the root canal. Conclusions: The use of Reciproc R25 instruments in root canal retreatments carried out by postgraduate students was associated with a low incidence of fractures.

• Journal of Technologic Dentistry
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• v.13 no.1
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• pp.99-122
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• 1991

This study was conducted to investigate the job satisfaction of the dental technicians and evalate the relationship between it’s scores and certain variables. One hundred eighty dental technicians were sampled from 300 among the 2552 dental technicians by wide distribution method, in September 1990. Data were collected by administering the instrument, the researcher developed for measuring the independent and dependent variables. The statistical methods utilized in this study were one-way analysis of variance, correlation and multiple regression analysis. The data were analyzed by SPSS(Statistical Package for Social Science), utilizing PC. The statistical significance was tested at 0.05 level. The major findings of the study were as follows : 1. The job satisfaction measuring instrument, the researcher developed, could measured the job satisfaction of dental technicians. The Maximum score of the instrument was 125, the highest score of dental technicians was 106, the lowest score was obtained 38, the mean score was 72.228 and standard deviation was 12.804. 2. The personal variables of dental technicians were related with the job satisfaction scores. The job satisfaction scores were positively correlated, at 0.01 level, with the scores of age(r=0.379), year(r=0.218), aptitude(r=0.415), marry(r=0.202), income(r=0.381), career(r=0.316). 3. The family variables scores of dental technicians were not correlated with the job satisfaction scores. 4. The personal characteristics of dental technicians were related with the job satisfaction. The job satisfaction score were positively correlated beyond the significant level, with the cheerfulness scores(r=0.398) and stability scores(r=0.224). 5. The job-related variables of the dental technicians were related with the job satisfaction scores. The correlation coefficient between job satisfaction scores and turnover scores was r=0.23, and quantity scores was r=0.300.

• Journal of Korean society of Dental Hygiene
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• v.15 no.1
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• pp.1-9
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• 2015

Objectives: The purpose of this study is to investigate the use of happiness index in dental hygienists. This study can be used to improve the quality of life and the turnover intention in the dental hygienists. Methods: The subjects were 281 dental hygienists in Seoul, Gyeonggi-do, and Chungcheong province. A self-reported questionnaire was completed by the subjects. The questionnaire consisted of 7 questions of general characteristics of the subjects, 7 questions of dental hygiene performance, and 9 questions of happiness index. The instrument for happiness index was modified from Suh and Koo. Cronbach's alpha was 0.850 in the happiness index measure by Likert 7 scale. The instrument for professionalism was modified from Baek and consisted of 25 questions measure by Likert 5 scale. Cronbach's alpha was 0.694 in the professionalism. The instrument for turnover intention was modified from Lee and consisted of 5 questions measured by Likert 5 scale. Cronbach's alpha was 0.712 in turnover intention. Data were analyzed using SPSS 18.0. for one way ANOVA, Duncan posthoc test, Pearson correlation coefficients and hierarchical regression. Results: The means of happiness index, professionalism and turnover intention of subjects were 4.44, 3.06 and 3.05, respectively. The happiness index was higher in those who are married(4.66), those who have high income, and those who have careers in dental hygienists(4.61). There were significant differences in the happiness index by the average daily working hours, place of treatment, work intensity and off duty hours. Conclusions: This study suggests that improvement of the happiness index in clinical dental hygienists requires the continuing and systematic education program and administrative support that can reduce the turnover intention.