| COMPENSATION EFFECT OF EXPOSURE TIME INCREASE TO DECREASED LIGHT INTENSITY OF VISIBLE-LIGHT CURING UNIT |
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| 가시광선 중합기의 조사강도 감소에 대한 조사시간 증가의 보상효과 |
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윤태원, 이창섭, 이상호 |
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조선대학교 치과대학 소아치과학교실 |
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| Abstract |
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The purpose of this study was to evaluate the compensation effect of exposure duration increase to decreased light intensity of visible-light curing unit. The specimen with 2mm thickness was made of Restorative Z-100TM (A2 shade, 3M Dental Products, U.S.A.) and cured with OptiluxTM (Demetron Research Co. U.S.A.). The light intensity was controlled to 420 mW/cm2, 540 mW/cm2, 630 mW/cm2 and curing time, also, controlled to 40, 60, 80 seconds. Cured specimen was stored in a light-proof container for 24 hours to post-irradation was completed. Microhardness of top and bottom surface of specimen were measured to evaluate the depth of cure. The obtained results were as follows: 1. The microhardness of top and bottom surface of the composite resin specimen was increased significantly as light intensity and exposure time was increased (P<0.01). 2. Light intensity was more correlated with bottom microhardness(γ≥0.438) than top microhardness(γ≥0.213), and exposure time was more correlated with top microhardness (γ≥0.424) than bottom microhardness(γ≥0.335). 3. The regressive equation was obtained in this study as follows : H=0.07×D+0.012×I+76 (H : Microhardness(KHN), D : Exposure time, I : Light intensity) |
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