3D 打印、CAD/CAM 技术和传统技术制作的临时修复材料标本经喷砂和激光表面处理后正畸托槽的抗剪粘结强度。
Shear bond strength of orthodontic brackets to specimens fabricated from temporary restorative materials by 3D-printing, CAD/CAM technology, and the conventional technique after surface treatment by sandblasting and laser.
机构信息
Department of Orthodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
Department of Prosthodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
出版信息
Int Orthod. 2023 Dec;21(4):100790. doi: 10.1016/j.ortho.2023.100790. Epub 2023 Jul 6.
OBJECTIVES
This study assessed the shear bond strength (SBS) of stainless steel (SS) orthodontic brackets to specimens fabricated from polymethyl methacrylate (PMMA) temporary restorative material by 3D-printing, computer-aided design/computer-aided manufacturing (CAD/CAM) technology, and the conventional technique, after surface treatment by sandblasting and laser.
MATERIAL AND METHODS
In this in vitro study, 60 disc-shaped specimens with 8mm diameter and 1mm height were fabricated from PMMA temporary restorative material by 3D-printing, CAD/CAM, and the conventional technique. In each group (n=20), half of the specimens were sandblasted while the other half underwent Er,Cr:YSGG laser irradiation. Brackets were bonded to the specimens and underwent thermocycling followed by SBS testing. Data were analysed by one-way ANOVA, independent t-test, and LSD test (alpha=0.05).
RESULTS
A significant difference existed among the three fabrication methods in SBS in both laser (P<0.001) and sandblasting (P<0.001) surface treatment groups. In laser group, the mean SBS of CAD/CAM (P=0.000) and conventional (P=0.000) groups was significantly lower than that of 3D-printing group. In sandblasting group, the SBS of CAD/CAM group was significantly lower than 3D-printing (P=0.000) and conventional (P=0.000) groups. The mean SBS of laser-treated specimens was significantly higher than sandblasted specimens in 3D-printing group (P=0.000), and significantly lower than sandblasted specimens in the conventional group (P=0.000). A significantly higher SBS was obtained by laser treatment compared with sandblasting irrespective of the fabrication method (P=0.000).
CONCLUSION
The highest SBS of SS orthodontic brackets to temporary restorative material was recorded for 3D-printed specimens treated by Er,Cr:YSGG laser irradiation.
目的
本研究评估了经喷砂和激光表面处理后，通过 3D 打印、计算机辅助设计/计算机辅助制造 (CAD/CAM) 技术和传统技术制造的聚甲基丙烯酸甲酯 (PMMA) 临时修复材料制成的不锈钢 (SS) 正畸托槽的剪切结合强度 (SBS)。
材料和方法
在这项体外研究中，通过 3D 打印、CAD/CAM 和传统技术从 PMMA 临时修复材料中制造了 60 个直径为 8mm、高度为 1mm 的圆盘状样本。在每组 (n=20) 中，一半的样本进行喷砂处理，另一半进行 Er,Cr:YSGG 激光照射。将托槽粘接到样本上，进行热循环后进行 SBS 测试。数据采用单因素方差分析、独立 t 检验和 LSD 检验 (alpha=0.05) 进行分析。
结果
在激光和喷砂表面处理组中，三种制造方法的 SBS 存在显著差异 (P<0.001)。在激光组中，CAD/CAM (P=0.000) 和传统 (P=0.000) 组的 SBS 均值明显低于 3D 打印组。在喷砂组中，CAD/CAM 组的 SBS 明显低于 3D 打印 (P=0.000) 和传统 (P=0.000) 组。激光处理组的 SBS 均值明显高于 3D 打印组的喷砂处理组 (P=0.000)，明显低于传统组的喷砂处理组 (P=0.000)。与喷砂处理相比，激光处理无论制造方法如何，均能获得更高的 SBS (P=0.000)。
结论
经 Er,Cr:YSGG 激光处理的 3D 打印 SS 正畸托槽与临时修复材料的最高 SBS。
Zotero 插件