• 대한치과기공학회지
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• 제38권3호
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• pp.209-216
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• 2016

Purpose: The purpose of this study is to discover the recognition of dental technicians on MSDS and to research the furnishing rate of Material Safety Data Sheet (MSDS) in dental laboratories. Method: 104 dental technicians who were self-written questionnaire. The results were analyzed by SPSS 12.0. The answers to the questionnaire underwent frequency analysis, chi-square test were performed. Results: The result of cross analysis on the occurrence of occupational diseases according to whether MSDS is furnished showed that the group with MSDS furnished had 37.8% of damages due to their occupation, but the group with MSDS unfurnished had 65.7% of damages due to their occupation, which displayed a significant difference(p<0.05). The result of cross analysis on whether the education about chemicals according to whether MSDS is furnished showed there were relatively more responses of no education on the types and characteristics of chemicals, the effect on human body and its risk, emergency measure when exposed to risk, the treating and storing methods and the disposal methods. In addition, there were significant differences on whether all the above education was done between the group with MSDS furnished and the group without MSDS(p<0.000). Conclusion: In order to secure safe working environment of dental technicians and to reduce occurrence of damage caused by chemicals, the related education is necessary. The recognition of dental technicians on MSDS and furnishing rate is increasing but still insufficient, so the related organizations need to establish education and PR measures for prevention of damage.

• 한국병원경영학회지
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• 제26권2호
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• pp.17-26
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• 2021

Purposes: This study aims to identify factors affecting dental university hospitals' profitability and understand recent their business condition. Methodology: Data from 2016 to 2019 was collected from financial statement, public open data in 8 dental university hospitals. For the study, multiple regression test with stepwise selection was applied. Findings: First of all, 9 out of 19 independent variables were selected by stepwise selection. As a result of multiple regression test with selected independent variables and the dependent variable(operating profit margin ratio), the factors affecting hospitals' profitability were the number of dental unit chair, hospital location, debt ratio, total capital turnover ratio, employment cost rate, material cost rate, management expense rate, the number of patient per a dentist. Practical Implication: To improve dental university hospitals' profitability, hospitals specifically analysis and manage their cost such as employment, material and management cost and seek effectiveness by managing the proper number of patient per a dentist.

• 대한치과보철학회지
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• 제44권4호
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• pp.477-487
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• 2006

Purpose : this study was to evaluate the fitness of adjustable dental impression trays on the Koreans : the trays used in the previous study by Kim et al. as part of the dental adjustable tray development project were improved and modified. Material and method: The patterns of tray were made through CAD-CAM process, and a simple silicone-base molds were made from them. The trial products were reproduced by pouring polyurethane into these molds. 30 male students(Wonkwang University, Dental College) and 30 female students (Wonkwang Health Science College, Department of Dental Hygiene) were selected and Reversible hydrocolloid impression materials were used for this study. The fitness of the trays was evaluated by measuring the width and length of impression materials of each measurement sites. Results and conclusion : 1. In adapting the trays inside the mouth, a uniform width of impression material(3 $\sim$ 6mm) was obtained in most sites due to the tooth stops and the inclined planes accommodating the width of the tray 2. The thickness of impression material in the central part of the palate was a mean 9.8mm, which turned out to be somewhat thick. 3. In the mandible. the thickness of the impression material in the lingual side inferior to the contact point of the 1st and 2nd molars was 2.7mm, and the thickness of the material in the lingual side of the rearmost margin was 2.5 mm. The thickness of the impression material of these areas was relatively thin.

• The Journal of Advanced Prosthodontics
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• 제9권2호
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• pp.99-103
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• 2017

PURPOSE. The purpose of this study was to achieve more retention and stability and to delay or prevent screw loosening. MATERIALS AND METHODS. Twenty implants (Implantium 3.4 mm, Dentium, Seoul, Korea) were divided into 2 groups (n = 20). In the first group, an adhesive material was applied around the screw of the abutments (test group). In the second group, the screws are soaked in saliva (control group). All the screws were torqued under 30 N/cm, Then, the samples were gone through a cyclic fatigue loading process. After cyclic loading, we detorqued screws and calculated detorque value. RESULTS. In comparison with the control group, all the implant screws in the test group were smeared with the adhesive material, showing significant higher detorque value. CONCLUSION. There are significantly higher detorque values in the group with adhesive. It is recommended to make biocompatible adhesive to reduce screw loosening.

• 대한치과기공학회지
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• 제40권2호
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• pp.73-82
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• 2018

Purpose: The purpose of this study was to investigate the production environment of crown prosthesis for National Health Insurance(NHI) benefit. Methods: This study carried out self-administered questionnaire survey from September 1, 2016 to October 31 by having research subjects as 261 dental technician. Except 100 copies with incomplete response, 161 copies were used as the materials of final analysis. Results: Unlike gold crowns, the material cost of metal crowns was paid at the dental laboratory(86.3%). Total material consumption for making metal crown was more than gold crown(63.4%), especially for the finishing and polishing processes(78.3%). The subjects responded that a routine dental laboratory fee of crown prosthesis is unreasonable, and it is necessary to adjust and improve it(metal crown 96.2%, gold crown 96.9%). NHI coverage dental prosthesis was not marked on the order form(46.0%), and the dental laboratory fee of that was nor received(64.0%). Conclusion : It is necessary to estimate the NHI cost level of the crown prosthesis by reflecting the production environment and engineering process in dental laboratories. In addition, institutional arrangement should be backed up so that dental laboratories can receive appropriate dental laboratory fee.

• 디지털융복합연구
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• 제15권2호
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• pp.215-223
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• 2017

본 연구의 목적은 물질안전보건자료(MSDSs)의 인식정도와 영향을 미치는 근무환경특성이 무엇인지 분석함으로서 향후 치과재료에 대한 위험 유해성에 대한 인식을 개선하고자 대구 경북지역에 근무하는 치과위생사 238명을 조사하였다. 물질안전보건자료(MSDSs)의 항목별 중요도의 평균점수가 $3.98{\pm}0.59$점, 가장 높은 항목은 '유해 위험성'으로 나타났고 개선에 대한 필요도 평균점수는 $4.34{\pm}0.57$점으로 조사되었다. 개선필요도는 경력이 길어질수록 평균점수가 높아지고 항목별 중요도 차이는 치과 병원에 근무하는 대상자가 높은 점수를 보였다(p<0.01). 치과위생사들의 치과재료의 화학물질에 대한 안전을 확보하고 근로환경 질의 향상을 위하여 치과재료의 화학물질을 설명하고 있는 물질안전보건자료(MSDSs)에 대한 좀 더 적극적인 홍보 및 교육이 필요하며, 치과 병의원 근로자의 근로 안전을 위한 구체적인 정책 및 제도가 마련되어야 할 것이라 사료되어 진다.

• 디지털융복합연구
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• 제16권4호
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• pp.185-194
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• 2018

본 연구는 치과위생사들의 치과재료에 대한 물질안전보건자료(Material Safety Data Sheet, MSDS)의 인식도와 유해화학물질 취급 시 안전 실태에 대해 파악하고자 실시하였다. 연구는 광주광역시에 근무 중인 치과위생사 250명을 대상으로 2015년 1월부터 2월까지 조사하였고, 235명의 자료를 최종분석 대상으로 하였다. 그 결과 치과재료에 대한 MSDS 인지 정도는 연령이 높을수록 인지도가 높게 나왔으며(p<0.05), 치과병원에 근무하는 치과위생사(p<0.001)에서 유의하게 높았다. 치과재료의 유해화학물질위해성에 대한 인식도에 영향을 미치는 요인은 MSDS인식도(p<0.001)이었고, 유해화학물질 노출 시 응급처치에 대한 인식도에 영향을 미치는 요인은 유해위험성 교육을 받은 경험(p<0.001)으로 나타났다. 따라서 치과위생사들의 치과재료에 대한 MSDS 인식도와 유해화학물질 취급 시 안전 실태에 대해 파악함으로써 유해화학물질 취급 시 안전에 대한 올바른 인식 확립과 이로 인한 사고를 예방하기 위한 교육 프로그램 개발에 기초자료를 제공하고자 한다.

• 대한치과의사협회지
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• 제53권3호
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• pp.195-200
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• 2015

Cementation is the last procedure and an important factor to access successful fixed prosthodontic treatment. Even though there are many kinds of luting materials in dental field, the resin cements are popularly used in now. Metals, polymers and ceramics are used as a material of fixed dental prosthesis. The bonding mechanisms between teeth and fixed restorations are composed of mechanical and chemical mechanism. In dentistry, we are relying on mechanical bonding, but we tried to get chemical bonding and many ways are introduced. So, we have to approach luting procedure differently by the materials of prosthesis for clinical success. In this article, let us think the proper cementation ways according to each prosthesis material.

• The Journal of Advanced Prosthodontics
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• 제7권4호
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• pp.323-328
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• 2015

PURPOSE. This in-vitro study was designed to evaluate retention forces, microleakage and plastic deformation of a prefabricated 2-implant bar attachment system (SFI-Bar, Cendres+$M{\acute{e}}taux$, Switzerland). MATERIALS AND METHODS. Two SFI implant-adapters were torqued with 35 Ncm into two implant analogues. Before the tube bars were finally sealed, the inner cavity of the tube bar was filled with liquid red dye to evaluate microleakage. As tube bar sealing agents three different materials were used (AGC Cem (AGC, resin based), Cervitec Plus (CP; varnish) and Gapseal (GS; silicone based). Four groups with eight specimens each were tested (GS, GS+AGC, AGC, CP). For cyclic loading, the attachment system was assembled parallel to the female counterparts in a chewing simulator. The mean retention forces of the initial and final ten cycles were statistically evaluated (ANOVA, ${\alpha}{\leq}.05$). RESULTS. All groups showed a significant loss of retention forces. Their means differed between 30-39 N initially and 22-28 N after 50,000 loading cycles. No significant statistical differences could be found between the groups at the beginning (P=.224), at the end (P=.257) or between the loss of retention forces (P=.288). Microleakage occurred initially only in some groups but after 10,000 loading cycles all groups exhibited microleakage. CONCLUSION. Long-term retention forces of the SFI-Bar remained above 20 N which can be considered clinically sufficient. The sealing agents in this study are not suitable to prevent microleakage.

• 치위생과학회지
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• 제14권3호
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• pp.349-355
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• 2014

본 연구는 최근 치의학계 전반적으로 치과용 캐드캠 시스템의 사용이 증가함에 따라 새로운 재료의 개발도 활발히 이루어지고 있는 현실을 반영하였다. 최근 새롭게 개발된 고정성 보철물의 제작 재료인 연질금속재료를 이용하여 제작된 고정성 보철물의 변연 간격을 평가하여 봄으로써 신재료의 임상적 허용 가능성을 변연 간격을 기준으로 가늠하여보고자 하였으며, 나아가서는 치과의사, 치과위생사 및 치과기공사 등 해당 분야 임상가들에게 참고자료를 제시하고자 하였다. 연구 결과에 따르면 연질금속블록을 가공하여 제작된 집단이 전통적인 방식에 의해 제작된 집단보다 우수한 변연간격을 보였으나, 통계적으로 유의하지 않았다. 또한 연질금속블록을 가공하여 제작된 보철물들의 변연 간격이 임상적 허용 수치로 제시되고 있는 $120{\mu}m$를 넘지 않는 것으로 보아 변연 간격을 기준으로 하였을 때 임상적으로 허용이 가능할 것으로 생각된다.