Department of Restorative Dental Science, Center of Dental Biomaterials College of Dentistry, University of Florida, Gainesville, FL, United States.
Department of Dental Clinical Sciences, Faculty of Dentistry, Dalhousie University, 5981 University Ave., Halifax, Nova Scotia B3H 4R2, Canada; Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Parana, Brazil.
J Dent. 2022 Jul;122:104141. doi: 10.1016/j.jdent.2022.104141. Epub 2022 Apr 25.
To evaluate the depth of cure (DOC) of ten contemporary resin-based composites (RBCs), light-cured using different LCUs and exposure times.
The power, radiant emittance, irradiance, radiant exposure (RE), and beam profiles from a laser (M, Monet), a multi-peak (V, Valo Grand), and single-peak (S, SmartLite Pro) LCU were measured. The DOC was measured using a 6-mm diameter metal mold and a solvent dissolution method to remove the uncured RBC. The length of the remaining RBC was divided by 2. The exposure times were: 1 s and 3 s for M, 10 s and 20 s for V, and 10 s and 20 s for S. Data were analyzed using: Bland-Altman distribution, Pearson's Correlation, and an artificial neural network (ANN) to establish the relative importance of the factors on the DOC (α=0.05; β=0.2).
Significant differences were found in the DOC achieved by the different LCUs and composites. The laser LCU emitted the highest power, radiant emittance is used above and in the tables and delivered the highest irradiance. However, this LCU used for 1 s delivered the lowest RE and produced the shortest DOC in all ten RBCs. The ANN demonstrated that the RE is the most critical factor for the DOC. Bland-Altman comparisons showed that the DOCs achieved with the laser LCU used for 1 s were between 17 and 34% shorter than the other conditions.
Although the laser LCU cured all 10 RBCs when used for 1 s, it produced the shallowest DOC, and some RBCs did not achieve their minimum DOC threshold. The RE and not the irradiance was the most important factor in determining the DOC of these 10 RBCs.
Despite delivering high power and irradiance, the laser used for l s delivered a lower radiant exposure than the conventional LCUs used for 10 s. This resulted in a shorter DOC.
评估十种当代树脂基复合材料（RBC）的深层固化（DOC），使用不同的 LCU 和曝光时间进行光固化。
测量了激光（M，Monet）、多峰（V，Valo Grand）和单峰（S，SmartLite Pro） LCU 的功率、辐射发射率、辐照度、辐射量（RE）和光束分布。使用 6 毫米直径的金属模具和溶剂溶解方法测量 DOC，以去除未固化的 RBC。剩余 RBC 的长度除以 2。曝光时间为：M 为 1 秒和 3 秒，V 为 10 秒和 20 秒，S 为 10 秒和 20 秒。使用 Bland-Altman 分布、Pearson 相关和人工神经网络（ANN）分析数据，以确定因素对 DOC 的相对重要性（α=0.05；β=0.2）。
不同 LCU 和复合材料的 DOC 存在显著差异。激光 LCU 发射的功率最高，辐射发射率在表中和表格上方使用，并提供最高的辐照度。然而，这种 LCU 用于 1 秒时，在所有十种 RBC 中产生的 RE 最低，从而产生的 DOC 最短。ANN 表明，RE 是 DOC 的最关键因素。Bland-Altman 比较表明，激光 LCU 用于 1 秒时的 DOC 比其他条件短 17%至 34%。
尽管激光 LCU 在用于 1 秒时可以固化所有 10 种 RBC，但它产生的 DOC 最浅，有些 RBC 未达到其最小 DOC 阈值。RE 而不是辐照度是决定这 10 种 RBC 的 DOC 的最重要因素。
尽管激光发射的功率和辐照度很高，但在 1 秒时的辐射量却低于传统 LCU 在 10 秒时的辐射量。这导致了较短的 DOC。
