• TITLE: INVESTIGATION OF LIGHT INTENSITY OF WIRELESS LED LIGHT CURING UNITS
• AUTHOR(S): G. Georgiev, Ts. Dikova, V. Panov
• ABSTRACT: In recent years, LED light curing units (LCUs) have become the main source of light for the polymerization of resin based composites (RBCs). Various factors can affect the normal functioning of LCUs, one of which is the battery charge of the wireless models. The aim of this study is to evaluate the stability of the light intensity of different brands of wireless LED LCUs by measuring it from a fully charged to a fully discharged battery. For this purpose 10 new different fully-charged wireless LED LCUs are used. Light intensity is measured with a digital radiometer. For each unit, the number of curing cycles of 20 s until full battery drop is determined as well as the change in light intensity with increasing the number of cycles (N) and decreasing the battery life (%). It has been found that for some devices (LY-C240, SK-L029A, CV-215, OSA-F686C, Xlite4, D-Light Duo) the light intensity is lower than specified by the manufacturer, which may cause incorrect determining of the optimal polymerization time. In six of the examined models - Bluephase N, D-Light Duo, LY- C240, Demi Plus, I-LED 2500 and Elipar Deep Cure S, the light intensity is stable and independent of the battery life. In the other devices (SK-L029A, CV-215, Xlite4, OSA-F686C), the battery discharge causes a decrease in light intensity. It can be concluded that dentists have to periodically measure the light intensity of their LCUs and regularly recharge them, especially in battery- dependent models
• PAGES: 40-
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