Department of Orthodontics, Bezmialem Vakif University, Istanbul, Turkey.
Department of Pediatric Dentistry, Bezmialem Vakif University, Istanbul, Turkey.
J Appl Biomater Funct Mater. 2020 Jan-Dec;18:2280800020901716. doi: 10.1177/2280800020901716.
To evaluate the effects of three different curing units on the physical and mechanical features of three different orthodontic adhesive resin materials.
45 specimens (5 mm in diameter, and 2 mm in thickness) of each of the three different adhesive composite resin materials (Transbond XT, Grēngloo™ Adhesive and Light Bond Paste) were cured with three different light units (a polywave third generation (Valo), a monowave (DemiUltra), and a second-generation LED (Optima 10)). To quantify degree of conversion (DC), the Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy was used in transmission mode (ALPHA FT-IR Spectrometer, Bruker Optics, Germany). Vickers hardness value was recorded under constant load 100 g for 10 s with a microhardness tester (HMV M-1, Shimadzu Corp., Kyoto, Japan). The data were statistically analyzed using Kruskal-Wallis and chi-square tests. The level of significance was considered < 0.05.
The highest DC values were obtained as a result of curing with Optima 10. This rate was followed by Demi Ultra and Valo, respectively. Transbond XT samples showed a lower level of conversion than the samples of Light Bond Paste and Grēngloo™ Adhesive. The top surfaces of each material showed higher hardness values than the bottom surfaces ( < 0.05). The Light Bond Paste showed the highest hardness values both on the top and bottom surfaces among the three materials, followed by Grēngloo™ Adhesive. While the hardness values of the top surfaces of the samples cured with Demi Ultra and Valo light units were similar, higher hardness values are recorded with Valo on the bottom surfaces (Valo; 85.200/75.200 (top/bottom) versus Demi Ultra; 86.100/66.000 (top/bottom)).
The different DC and the surface hardness properties were recorded for the resin as orthodontic adhesives depending on different light units. Shorter radiation time caused lower DC and surface hardness values.
评估三种不同光固化机对三种不同正畸粘接树脂材料的物理和机械性能的影响。
用三种不同的光固化机（polywave 第三代（Valo）、monowave（DemiUltra）和第二代 LED（Optima 10））分别固化三种不同的粘接复合树脂材料（Transbond XT、Grēngloo™Adhesive 和 Light Bond Paste）的 45 个样本（直径 5 毫米，厚度 2 毫米）。为了量化转化率（DC），采用衰减全反射傅里叶变换红外光谱法（ALPHA FT-IR 光谱仪，Bruker Optics，德国）进行透射模式测量。用显微硬度计（HMV M-1，岛津公司，京都，日本）在恒定负载 100 克下记录维氏硬度值，持续 10 秒。使用 Kruskal-Wallis 和卡方检验对数据进行统计分析。显著性水平设为 < 0.05。
Optima 10 光固化后获得的 DC 值最高。其次分别是 Demi Ultra 和 Valo。Transbond XT 样本的转化率低于 Light Bond Paste 和 Grēngloo™Adhesive 样本。各材料的顶面硬度值高于底面（ < 0.05）。三种材料中，Light Bond Paste 的顶面和底面硬度值均最高，其次是 Grēngloo™Adhesive。虽然用 Demi Ultra 和 Valo 光固化机固化的样本的顶面硬度值相似，但 Valo 光固化机固化的样本底面硬度值较高（Valo：85.200/75.200（顶面/底面）比 Demi Ultra：86.100/66.000（顶面/底面））。
不同的光固化机对正畸粘接树脂的 DC 和表面硬度性能有不同的影响。辐射时间越短，DC 和表面硬度值越低。
