Department of Fixed and Removable Prosthodontics, School of Dentistry, The University of Jordan, Amman, 11942, Jordan.
Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Sci Rep. 2023 Sep 15;13(1):15341. doi: 10.1038/s41598-023-42415-4.
In-office bleaching, using hydrogen peroxide, is effective to remove dental enamel stains. However, bleaching agents can deteriorate surface properties of CAD-CAM materials. This in vitro study aimed to investigate the effect of in-office bleaching agents on Vickers hardness and surface topography of polished and unpolished dental CAD-CAM composite materials (Grandio blocs, Lava Ultimate, BRILLIANT Crios, Cerasmart), and a polymer-infiltrated ceramic network block (Vita Enamic). The specimens were randomly divided into two groups: unpolished or polished. The micro-hardness and surface topography of each group were measured before bleaching, after a 60 min bleaching period, and 24-h and one-month post-bleaching. In-office bleaching significantly influenced the Vickers hardness of both the polished and unpolished CAD/CAM composite blocks, with Vita Enamic exhibiting the least hardness stability among all groups. Furthermore, in-office bleaching significantly influenced the surface roughness of unpolished CAD/CAM composite blocks. There was a significant difference in hardness reduction between the polished and unpolished specimens for most of the investigated materials at different time points. The bleaching did not influence the surface roughness of the investigated polished group, except for Vita Enamic and Lava Ultimate. However, it did influence the surface roughness of the investigated materials in the unpolished group.
诊室漂白（使用过氧化氢）可有效去除牙釉质色斑。然而，漂白剂可能会降低 CAD-CAM 材料的表面性能。本体外研究旨在探讨诊室漂白剂对抛光和未抛光牙科 CAD-CAM 复合材料（Grandio 块、Lava Ultimate、BRILLIANT Crios、Cerasmart）和聚合物渗透陶瓷网络块（Vita Enamic）的维氏硬度和表面形貌的影响。将样本随机分为两组：抛光组和未抛光组。每组的显微硬度和表面形貌在漂白前、漂白 60 分钟后、漂白后 24 小时和 1 个月进行测量。诊室漂白显著影响抛光和未抛光 CAD/CAM 复合块的维氏硬度，所有组中 Vita Enamic 的硬度稳定性最低。此外，诊室漂白显著影响未抛光 CAD/CAM 复合块的表面粗糙度。在不同时间点，大多数研究材料的抛光和未抛光样本的硬度降低存在显著差异。漂白对研究中抛光组的表面粗糙度没有影响，除了 Vita Enamic 和 Lava Ultimate。然而，它确实影响了未抛光组中研究材料的表面粗糙度。
