Lim Ho-Kyung, Keerthana Subramanian, Song So-Yeon, Li Chongyang, Shim Ji Suk, Ryu Jae Jun
Department of Oral and Maxillofacial Surgery, Korea University Guro Hospital, 148, Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea.
Graduate School of Clinical Dentistry, Korea University, 46, Gaeunsa 2-gil, Seongbuk-gu, Seoul 02842, Republic of Korea.
Materials (Basel). 2024 Sep 2;17(17):4342. doi: 10.3390/ma17174342.
(1) Background: To compare the degree of conversion of resin cores in various types of cavities and determine an effective irradiation method for achieving a higher degree of conversion. (2) Methods: Four different-sized cavities (narrow-shallow, narrow-deep, wide-shallow, and wide-deep) were simulated using a Teflon mold. The light irradiance reaching the bottom of each mold was measured by positioning a radiometer. The degree of conversion of the dual-cure resin core after irradiation (400 mW/cm for 20 s, 400 mW/cm for 40 s, and 800 mW/cm for 20 s) was measured using Fourier-transform near-infrared spectroscopy. (3) Results: The highest light irradiance was found at the bottom of wide-shallow cavities, followed by wide-deep, narrow-shallow, and narrow-deep ones ( < 0.001). In narrow cavities, irradiation at 800 mW/cm for 20 s led to a significantly higher degree of conversion ( < 0.001). In wide cavities, irradiation at 400 mW/cm for 40 s and 800 mW/cm for 20 s both led to a significantly higher degree of conversion ( < 0.001). (4) Conclusions: Less curing light reaches the bottom of cavities with a smaller diameter and greater depth. Providing a higher irradiance of light can induce a higher degree of conversion of resin composites in narrower cavities.
(1) 背景：比较不同类型窝洞中树脂核的固化程度，并确定一种能实现更高固化程度的有效照射方法。(2) 方法：使用聚四氟乙烯模具模拟四种不同尺寸的窝洞（窄浅、窄深、宽浅和宽深）。通过放置辐射计测量到达每个模具底部的光辐照度。使用傅里叶变换近红外光谱法测量照射后（400 mW/cm 照射 20 秒、400 mW/cm 照射 40 秒和 800 mW/cm 照射 20 秒）双固化树脂核的固化程度。(3) 结果：在宽浅窝洞底部发现的光辐照度最高，其次是宽深、窄浅和窄深窝洞（<0.001）。在窄窝洞中，800 mW/cm 照射 20 秒导致固化程度显著更高（<0.001）。在宽窝洞中，400 mW/cm 照射 40 秒和 800 mW/cm 照射 20 秒均导致固化程度显著更高（<0.001）。(4) 结论：直径较小且深度较大的窝洞底部接收到的固化光较少。提供更高的光辐照度可诱导较窄窝洞中树脂复合材料的固化程度更高。
