Medical Care Facility A2 Dental, Trogir, Croatia.
Department of Endodontics and Restorative Stomatology, School of Dental Medicine, University of Zagreb, Zagreb, Croatia.
Med Glas (Zenica). 2021 Aug 1;18(2):505-509. doi: 10.17392/1323-21.
Aim To determine irradiance of light-curing units (LCUs) in dental offices in three Croatian cities and to compare irradiance values with the age and model of LCUs. Methods Private and public dental offices in three most prominent cities in Croatia (Rijeka, Split and Zagreb) were included in this study. In total, 195 LCUs were tested, using radiometer Ivoclar Bluephase Meter 2 for irradiance (mW/cm2 ). The minimum acceptable value was set at 400 mW/cm2 . The age, model and difference between declared and measured irradiance of the LCUs were also determined. Of the total of 195 LCUs, 190 (98%) were LED (light-emitting diode) and 5 (2%) were QTH (quartz-tungsten - halogen). Results The mean age of tested LCUs was 4.43±3.4 years; the oldest was in Rijeka, 5.2±3.8 years. The overall mean irradiance for all three cities was 806.4 mW/cm2 (p=0.0004). Of all LCUs, 11.3% were considered clinically unacceptable with irradiance of less than 400 mW/cm2 . Of all tested LCUs 42% (p=0.0005) had a 30% lower value of irradiance than the manufacturer of the LCU declared. In 73% tested LCUs, there was a matching between measured and declared irradiance. The age and model of LCUs had the most significant impact on irradiance. Conclusion The most commonly used LCU included in dental offices was LED. Mean irradiance was good enough to secure adequate polymerization of resin-based materials. Irradiance decreases with usage time of LCU.
确定克罗地亚三个城市牙科诊室中的光固化机（LCU）的辐照度，并将辐照度值与 LCU 的年龄和型号进行比较。
本研究纳入了克罗地亚三个最大城市（里耶卡、斯普利特和萨格勒布）的私人和公共牙科诊室。使用 Ivoclar Bluephase Meter 2 型辐射计（辐照度，mW/cm2）测试了总共 195 个 LCU。将最小可接受值设定为 400 mW/cm2。还确定了 LCU 的年龄、型号以及宣称和测量辐照度之间的差异。在总共 195 个 LCU 中，有 190 个（98%）为 LED（发光二极管），5 个（2%）为 QTH（石英钨-卤素）。
测试的 LCU 的平均年龄为 4.43±3.4 年；最老的是在里耶卡，为 5.2±3.8 年。所有三个城市的总体平均辐照度为 806.4 mW/cm2（p=0.0004）。在所有 LCU 中，有 11.3%的辐照度低于 400 mW/cm2，被认为在临床不可接受。在所有测试的 LCU 中，有 42%（p=0.0005）的辐照度比 LCU 制造商宣称的低 30%。在 73%的测试 LCU 中，测量和宣称的辐照度相匹配。LCU 的年龄和型号对辐照度有最显著的影响。
牙科诊室中最常用的 LCU 为 LED。平均辐照度足以确保树脂基材料的充分聚合。LCU 的使用时间会导致辐照度下降。
