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부가중합 실리콘 인상재 및 모형재의 젖음성에 관한 비교 연구
조리라,정경호,김경남,Cho, Lee-Ra,Chung, Kyung-Ho,Kim, Kyoung-Nam 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.2
Wettability of addition silicone impression material is very important property for making an accurate restoration. This study examined the impression quality in clinical condition and the wettability of impression and die material. Four commercially available addition silicone impression material (Express, Examix, Contrast, Perfect) and three die materials (Die-Keen, Vel-Mix, Fuji-Rock) were studied. A total of 50 putty/wash and heavy body/wash impressions of wet intact permanent molar teeth were examined for definition of the gingival sulcus reproduction and then classified in quality ranking. The percentage of the sulcus reproduction ability of each material was calculated from the sulcus depths of cross-sectioned epoxy resin casts from the impressions and clinically measured sulcus depths, The same impression materials were used to produce 3 groups of die stone casts form void entrapment die had been exposed to milk. Voids in the impression body and stone casts ere counted under a stereoscopic microscope. From the experiment, the following results were obtained : 1. Sulcus reproduction ability of additional silicone impression material were diminished in order of Express, Examix, Perfect, Contrast. The significant difference was found between Perfect and other material. Heavy body/wash combination was superior In putty/wash method n Perfect impression material. 2. In direct observation, Contrast showed least void in impression body but correlations ere not found between sulcus reproduction and void production. 3. In void entrapment laboratory test, wettability were diminished in order of Examix, Contrast, Express, Perfect. Clinical impression recording seems not to correlate with laboratory test. 4. The wettability of die material to impression material was not different in Express, Examix, Contrast. But, in Perfect, Die-Keen had superior wettability to others.
첨가성분에 따른 부가중합 실리콘 인상재의 세포독성에 관한 연구
조리라,고성희,정경호,김경남 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.3
The purpose of this study was to evaluate the biocompatibility of polyvinyl siloxane impression materials and it's components using cell culture techniques. In the cytotoxicity test, using the culture of L929 mouse fibroblast, the degree of gross cytotoxic effects on the cells by changes in the cell morphology was scored for each materials. And the changes in the cell membrane permeability was tested using the agar overlay test. The results were as follows: 1.The effect of Examix impression material had on cell viability by evaluating survival rates was more severe than any other materials and newly added surfactants. 2.NP-4, nonylphenoxy polyethylene ethanol homologs, showed some cytotoxicity than PC-550 and BYK066. 3.In the test of the changes in cell membrane permeability using the agar overlay method, any cytotoxicity was recorded in silicone base groups. 3.In agar overlay test, Examix and NP-4 showed most response index and lysis index. 4.The application of surfactant such as PC-550, NP-4, and BYK066 might be considered relatively biocompatible.
Microwave 처리가 폴리비닐실록산 인상재의 물리적 성질에 미치는 영향
최유리(Yu-Ri Choi),양송이(Song-Yi Yang),이용근(Yong-keun Lee),김경남(Kyoung-Nam Kim),김광만(Kwang-Mahn Kim) 대한치과재료학회 2012 대한치과재료학회지 Vol.39 No.1
Infection control of dental impression has become an important issue for dental technician. Dental impressions may be contaminated with microorganisms from patient’s saliva and blood. A microwave treatment can be used as a method to disinfect dental prosthesis. The aim of this study was to evaluate the physical properties of polyvinyl siloxane impression materials after microwave treatment. We performed microwave treatments using electrical microwave oven with and without hydrogen peroxide. Detail reproduction, compatibility with gypsum, linear dimensional change, contact angle, strain-in-compression and elastic recovery were evaluated before and after microwave treatment. Experimental groups were composed with 6 groups by irradiated conditions such as 1, 2 and 3 minutes with and without hydrogen peroxide solution of 3 wt% in microwave chamber. Control group was no treatment group. The results of all tests showed that there were no significant differences between before and after microwave treatment(p>0.05). So we recommend that the microwave treatments for polyvinyl siloxane impressions would be used in clinical field.