Director of Biomaterial and Prosthodontic Laboratory and Assistant Professor, Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, N.J; Adjunct Assistant Professor, Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, Calif.
Instructor, Sector of Angiogenesis Regenerative Medicine, Dr. Hajar Afsar Lajevardi Research Cluster (DHAL), Hackensack, N.J.
J Prosthet Dent. 2020 Dec;124(6):801-807. doi: 10.1016/j.prosdent.2019.11.013. Epub 2020 Feb 7.
The release of titanium (Ti) particles from the surface of endosseous dental implants is not well understood.
The purpose of this in vitro study was to evaluate the effect of thermocycling on the surface texture and release of Ti particles from the surface of dental implants.
Three MSI dental implants and 3 Ti alloy (TiAlV) plates were divided into 6 subgroups (n=3). Specimens in each group were subjected to 0 (control group), 100, 200, 500, 1000, and 2000 thermocycles. After each cycling process, artificial saliva was collected, and the concentrations of released Ti particles were quantified by inductively coupled plasma-mass spectrophotometry (ICP-MS). The surfaces of the dental implants and Ti plates were evaluated before and after thermocycling by scanning electron microscopy (SEM), and SEM images were analyzed by using the ImageJ software program. Data were analyzed by mixed-model ANOVA and post hoc Tukey tests (α=.05).
The greatest Ti release was seen after 2000 thermocycles. After increasing the number of cycles, additional Ti particles were released. SEM images of the surfaces of the dental implants and Ti plates displayed significant changes in surface texture.
Thermocycling continuously removed the protective TiO layer on the surface of dental implants, resulting in the release of Ti particles. The surface treatment and texture did not affect the release of Ti particles.
目前人们对骨内牙种植体表面钛（Ti）颗粒的释放机制还不甚了解。
本体外研究旨在评估热循环对牙种植体表面纹理和 Ti 颗粒释放的影响。
将 3 个 MSI 牙种植体和 3 个钛合金（TiAlV）板分为 6 组（n=3）。每组试件分别经过 0（对照组）、100、200、500、1000 和 2000 次热循环。每次循环后，收集人工唾液，并用电感耦合等离子体质谱仪（ICP-MS）定量分析释放的 Ti 颗粒浓度。在热循环前后，通过扫描电子显微镜（SEM）对牙种植体和 Ti 板的表面进行评估，并使用 ImageJ 软件程序对 SEM 图像进行分析。采用混合模型方差分析和事后 Tukey 检验（α=.05）对数据进行分析。
经过 2000 次热循环后，Ti 的释放量最大。随着循环次数的增加，释放的 Ti 颗粒也随之增加。牙种植体和 Ti 板表面的 SEM 图像显示表面纹理发生了显著变化。
热循环持续去除了牙种植体表面的保护性 TiO 层，导致 Ti 颗粒的释放。表面处理和纹理并不影响 Ti 颗粒的释放。
