• 대한치과기공학회지
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• 제30권1호
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• pp.17-23
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• 2008

Gypsum products are used for the preparation of stone casts of oral and maxillofacial structures and as important adjuncts to dental laboratory operations involved in the production of dental prosthesis. Accuracy and dimensional stability over time are properties of concern in fixed prothodontics. Gypsum products used in denstry are a form calcium sulfate hemihydrate and are classified as 1 of 5 types according to International Standard Organization(ISO) 6873. All die materials exhibit some dimensional change during setting, but expansion and contraction during setting and dimensional changes in response to varations in temperature and the water-powder ratio must be minimal. Although numerous investigators have studied the properties of die materials, several products have been introduced recently with manufacturer claims of superior dimensional stalility. The aim of this study was to determine the surface properties using various separating materials of dental gypsum products The results were as follows 1. In the comparison of first and second plaster distances before separation in different separating agent, there was no significant difference except using Trio separating agent. The interface using Trio separating agent forms like to pores. 2. In the comparison of first and second plaster distances after separation in different separating agent, there was significant difference. The interface of plasters using WD-40, Trio and Vaseline was showed some gaps. Each they were measured at average 7.97 $\pm$ 2.07 ${\mu}m$, 63.09 $\pm$ 23.25 ${\mu}m$, 27.59 $\pm$ 4.19 ${\mu}m$. 3. In the comparison of the surface, the surface of control sample(using none seperating agent) showed irregular properties and the surface using Trio and Vaseline become wrinkled. Specially the surface using Vaseline was showed shiny properties. But the surface using MAGIC SEP, Plaster seperating agent, WD-40 showed regular properties.

• 대한치과보철학회지
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• 제44권5호
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• pp.628-641
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• 2006

Statement of problem: Dental magnetic materials have been applied to removable prosthetic appliances, maxillofacial prostheses, obturator and dental implant but they still have some problems such as low corrosion resistance in oral environments. Purpose: To increase the corrosion resistance of dental magnetic materials, surfaces of Sm-Co and Nd-Fe-B based magnetic materials were plated with TiN and sealed with stainless steels. Materials and methods : Surfaces of Sm-Co and Nd-Fe-B based magnetic materials were plated with TiN and sealed with stainless steels, and then three kinds of electrochemical corrosion test were performed in 0.9% NaCl solution; potentiodynamic, potentiostatic, and electrochemical impedance test. From this study, corrosion behavior, amount of elements released, mean average surface roughness values, the changing of retention force, and magnetic force values were measured comparing with control group of non-coated magnetic materials. Results: The values of surface roughness of TiN coated Sm-Co and TiN coated Nd-Fe-B based magnetic materials were lower than those of non coated Sm-Co and Nd-Fe-B alloy. From results of potentiodynamic test, the passive current density of TiN coated Sm-Co alloy were smaller than those of TiN coated Nd-Fe-B alloy and non coated alloys in 0.9% NaCl solution. From results of potentiostatic and electrochemical impedance test, the surface stability of the TiN coated Sm-Co alloy was more drastically increased than that of the TiN coated Nd-Fe-B alloy and non-coated alloy. The retention and magnetic force after and before corrosion test did not change in the case of TiN coated magnetic alloy sealed with stainless steel. Conclusion: It is considered that the corrosion problem and improvement for surface stability of dental magnetic materials could be solved by ion plating with TiN on the surface of dental magnetic materials and by sealing with stainless steels.

• 대한치과의사협회지
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• 제15권11호
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• pp.745-752
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• 1977

• 대한치과의사협회지
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• 제17권2호통권117호
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• pp.146-151
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• 1979

• 대한치과의사협회지
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• 제11권3호
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• pp.177-184
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• 1973

• 대한치과의사협회지
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• 제17권3호통권118호
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• pp.203-213
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• 1979

• 대한치과의사협회지
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• 제29권3호통권262호
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• pp.190-194
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• 1991

• 대한치과의사협회지
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• 제9권9호
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• pp.530-534
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• 1971

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2015년도 춘계학술대회 논문집
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• pp.64-64
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• 2015

• 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.