Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Faculty of Dentistry, Dalhousie University, Halifax, NS, Canada.
Eur J Oral Sci. 2024 Aug;132(4):e12990. doi: 10.1111/eos.12990. Epub 2024 May 2.
This study examined the effect of high irradiance and short exposure times on the depth of cure of six resin-based composites (RBCs). Bluephase PowerCure and the Valo X light-curing units (LCUs) were used to photocure bulk-fill RBCs for their recommended exposure times: Admira Fusion x-tra (AFX/20s), Aura Bulk Fill (ABF/20s), Filtek One Bulk Fill (FOB/20s), Opus Bulk Fill APS (OBF/30s), Tetric EvoCeram Bulk Fill (TEC/10s) and Tetric PowerFill (TPF/10s). In addition, all bulk-fill RBCs were tested for depth of cure with one short 3 s exposure time from the Bluephase PowerCure or the Valo X in the Xtra Power mode. The RBCs (n = 10 per RBC) were inserted into a 4 mm diameter metal mold and covered by a polyester strip before being photocured. After 24 h of storage, uncured RBC was scraped away to determine the depth of cure of the RBCs. None of the RBCs achieved a 4 mm depth of cure. The depth of cure of TEC and TPF was unaffected by the exposure times (recommended or short) when using the Valo X. The depth of cure of AFX/20s, AFX/Xtra Power, ABF/Xtra Power, FOB/Xtra Power, and OBF/30s RBCs was greater when using Valo X compared to the Bluephase PowerCure. It was concluded that short exposure times can reduce depth of cure and should only be used for some RBCs.
本研究探讨了高光照度和短曝光时间对六种树脂基复合材料（RBC）固化深度的影响。Bluephase PowerCure 和 Valo X 光固化机（LCU）用于按照推荐的曝光时间对块状充填 RBC 进行光固化：Admira Fusion x-tra（AFX/20s）、Aura Bulk Fill（ABF/20s）、Filtek One Bulk Fill（FOB/20s）、Opus Bulk Fill APS（OBF/30s）、Tetric EvoCeram Bulk Fill（TEC/10s）和 Tetric PowerFill（TPF/10s）。此外，所有块状充填 RBC 均用 Bluephase PowerCure 或 Valo X 的 Xtra Power 模式进行一次 3 秒的短曝光时间测试，以检测其固化深度。将（n=每个 RBC 10 个）RBC 插入直径为 4 毫米的金属模具中，并用聚酯带覆盖，然后进行光固化。储存 24 小时后，刮去未固化的 RBC 以确定 RBC 的固化深度。没有一种 RBC 达到 4 毫米的固化深度。当使用 Valo X 时，TEC 和 TPF 的固化深度不受曝光时间（推荐或短）的影响。与 Bluephase PowerCure 相比，AFX/20s、AFX/Xtra Power、ABF/Xtra Power、FOB/Xtra Power 和 OBF/30s RBC 的固化深度在使用 Valo X 时更大。因此得出结论，短曝光时间会降低固化深度，只能用于某些 RBC。
