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IV형 경석고와 경화처리된 IV형 경석고 그리고 폴리우레탄 수지 치형재의 표면경도와 미세구조 특성의 비교
이완선,김지환,김태석,김남식,유진호,Lee, Wan-Sun,Kim, Ji-Hwan,Kim, Tae-Suk,Kim, Nam-Sic,Yu, Chin-Ho 대한치과기공학회 2012 대한치과기공학회지 Vol.34 No.3
Purpose: This study compared the surface hardness (Vickers) and microstructural characteristics between a type IV stone with and without die hardening treatment, a polyurethane die material. Methods: Materials used were a type IV stone(MG Crystal Rock), two die hardeners (Hardening bath, Epox-it), and a polyurethane resin material(Polyluck). Six specimens per group were prepared according to manufacturer's directions. The prepared specimens were tested by means of hardness test, one-way ANOVA analysis, scanning electron microscopic(SEM) observations and energy dispersive spectroscopic(EDS) analysis. Results: In the hardness test and its statistical analysis, there was no significant difference in the surface hardness between a type IV stone and type IV stone with die hardener coating, type IV stone mixed with an epoxy like material instead of water. In contrast, polyurethane resin material exhibited significantly greater surface hardness than other specimen groups (p<0.05). Conclusion: By considering the results of the hardness test, SEM observations and EDS analysis, although the die hardeners on type IV stone did not show remarkable improvement in surface hardness, the die hardener coating on the surface of type IV stone material did show decrease of microporous and improvement of surface defects.
치기공용 금속의 고객 만족도 평가에 관한 연구 - 귀금속 합금을 중심으로
김웅철(Woong-Chul Kim),오세윤(Sae-Yoon Oh),김지환(Ji-Hwan Kim),이세훈(Se-Hoon Lee),유진호(Chin-Ho Yu),김태석(Tae-Suk Kim),현혜정(Hye-Jung Hyun) 고려대학교 보건과학연구소 2004 보건과학논집 Vol.30 No.1
A questionnaire tool was newly developed to assess customer satisfaction indexs with dental precious alloys. The questionnaire was mailed to randomly selected 388 dental laboratory technicians who were owners of dental laboratory.<BR> All the data obtained from 145 persons who filled out the questionnaire were coded and analyzed with PC/SAS 8.1 program. Qualities of the products and services of some dental precious alloys, presently available in Korean dental market, were assessed for customer satisfaction index.<BR> The results were as follows :<BR> Customer satisfaction index was highest in W Co.(69), A Co.(69), H Co.(69) and followed by S Co.(63) in descending order.<BR> Statistically significant factors by multiple regression analysis affecting the latent variables were customer expectation(R² = 0.6973), service quality (R² = 0.1458), perceived value(R² = 0.0494), and general satisfaction (R² = 0.0203).<BR> Mean values of measurement variables related to customer satisfaction were lower most in a rating of performance relative to customer"s ideal product or service quality(2.90 ± 0.96), quality given price(2.92 ± 0.94), and perceived reliability value(2.97 ± 0.99), while that was highest in customer complaints(4.19 ± 1.15).<BR> With the above results considerations in mind, customer satisfaction with those dental precious alloys was affected by many proxies. Therefore it was suggested that the manufacturers and distributors endeavor to improve the customer satisfaction barometers through the proper control for the variables affecting them.
오세윤,김웅철,김지환,이병기,유진호,김태석,이준석,이주호 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.2
Conflicts between individuals are quite natural and they can act as an positive contributing factor not only to the development of an individual but also to the organization to which one belongs. But too much conflicts will always induce dissatisfaction and stresses, which will be destructive and harmful to all of them, and that is why we are always tying to seek(find) out the causes for the origination of conflicts and remedies to cope with them effectively. The present study, as the first one in a series of studies which our researchers contemplate executing, was designed to develop a measure of job satisfaction for dental laboratory technicians. One job satisfaction measure and two job satisfaction related measures, one for faithfulness for the job and the other for environmental characteristics of dental laboratory were newly developed. The newly developed measures were comprised of a total of 38 items, which were each 12 items for job satisfaction and faithfulness for the job and 14 items for environmental characteristics of dental laboratory With the aid of factor analysis for principal components and categorization of items by panel of professionals, items of each measure were grouped into 2-4 subscales. Contribution to internal consistency was the fina) criterion for an item's inclusion in a subscale. Internal consistency reliability of each item was attested through the statistical analysis on the data obtained from 55 structured questionnaires. Reliability of internal consistency of subscales in each measure of job satisfaction and faithfulness for the job ranged from 0.74 to 0.79 and 0.90-0.91 respectively. The result from this research came to draw the following conclusions. 1. Validity and internal consistency reliability of all the items of each measure was attested. 2. The newly developed measure of job satisfaction was found to be appropriate for (measuring the degree of job satisfaction of) dental technicians, as well as for (other) dental office personnels.
김지환,오세윤,김웅철,유진호,김태석,이준석,이원철 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.2
This study was carried out to investigate psychiatric stress symptoms and stress- inducing factors, such as role overload, work demand, work procedure and so forth in korean dental laboratory technicians. Questionnaires were mailed to randomly selected 1000 dental technicians who were systematically selected. Among them, 786 dental technicians completed the questionnaires and returned them. Validity test and reliability test on the questionnaires were done prior to the main survey, using the SCL-90-R as a standard. Stress-inducing factors were identified with a multiple regression analysis on the continuous variables. To investigate stress-inducing factors on stress symptoms, analysis on distribution of characteristics was performed, and then correlation analysis and multiple regression analysis was carried out. The results of the study were as follows: According to multiple regression analysis, there was a statistical correlation between stress symptoms and role overload, work procedure, occupation conflict, interpersonal relationship, social support, personality traits in stress symptom(GSID). The stress symptoms in korean dental laboratory technicians seemed to be mostly job related ones, and considering the results obtained from the study, it is suggested that reducing work load and proper health promotion programs for dental technicians be necessary.