| THERMAL CHANGE AND MICROHARDNESS IN CURING COMPOSITE RESIN ACCORDING TO VARIOUS CURING LIGHT SYSTEM |
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| 광중합기에 따른 복합레진 중합시 온도 변화와 미세경도에 관한 연구 |
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이동진, 김대업, 양영숙, 이광희 |
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원광대학교 치과대학 소아치과학교실.원광치의학연구소 |
Correspondence:
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| Abstract |
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The purpose of this study was to compare curing efficiency of newly developed curing units to traditional halogen curing unit by measuring thermal change and surface microhardness according to curing light system. Materials and mathods : The types of curing units were traditional low intensity halogen light(Optilux 360), plasma arc light(Flipo), low heat plasma arc light(Aurys), low intensity LED(Starlight), and high intensity LED(Freelight2). Temperature at the tip of light guide was measured by a digital thermometer using K-type thermocouple. And after resin was filled to 2, 3, 4mm teflon mold, bottom temperature measured during curing. After 24 hours, microhardness of top surface and bottom surface of each resin specimen were measured. Results : The result of this study can be summarized as follows, 1. As measuring temperature of curing unit tips, Flipo is the highest as 52.4℃,Freelight2(37.86℃),Optilux360(32.68℃),Aurys(32.34℃),and Starlight(26.14℃) were followed. 2. Flipo and Freelight2 were the highest similarly and Optilux360 and Aurys were similarly next and Starlight was lowest in temperature of bottom surface of resin mold. 3. Microhardness of top surface were generally similar, and Aurys was relatively low. 4. Optilux 360 and Freelight2 were the highest, and Flipo, Starlight, and Aurys were followed in microhardness of bottom surface. Conclusions : The results suggest that careful use of Flipo and Freelight2 might be able to cure greater depth of resin composite and do not cause thermal problems than other curing units. |
| Key Words:
Curing light, Thermal change, Microhardness |
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