Puskar Tatjana, Jevremovic Danimir, Williams Robert J, Eggbeer Dominic, Vukelic Djordje, Budak Igor
Department of Dentistry, Medical Faculty, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia.
Clinic for Prosthodontics, School of Dentistry, University Business Academy, Zarka Zrenjanina 179, 13000 Pancevo, Serbia.
Materials (Basel). 2014 Sep 11;7(9):6486-6501. doi: 10.3390/ma7096486.
Dental alloys for direct metal laser sintering (DMLS) are available on the market today, but there is little scientific evidence reported on their characteristics. One of them is the release of ions, as an indicator of the corrosion characteristics of a dental alloy. Within this research, the difference in the elution of metals from DMLS and cast (CM) samples of Co-Cr-Mo dental alloy in saliva-like medium of three different pH was examined by inductively-coupled plasma mass spectrometry (ICP-MS). The obtained results show that the metal elution in artificial saliva from the DMLS alloy was lower than the elution from the CM alloy. The release of all investigated metal ions was influenced by the acidity, both from the DMLS and CM alloy, throughout the investigated period of 30 days. The change in acidity from a pH of 6.8 to a pH of 2.3 for the cast alloy led to a higher increase of the elution of Co, Cr and Mo from CM than from the DMLS alloy. The greatest release out of Co, Cr and Mo was for Co for both tested alloys. Further, the greatest release of all ions was measured at pH 2.3. In saliva of pH 2.3 and pH 4.5, the longer the investigated period, the higher the difference between the total metal ion release from the CM and DMLS alloys. Both alloys showed a safe level of elution according to the ISO definition in all investigated acidic environments.
如今市场上有用于直接金属激光烧结（DMLS）的牙科合金，但关于其特性的科学证据报道较少。其中之一是离子释放，它可作为牙科合金腐蚀特性的一个指标。在本研究中，通过电感耦合等离子体质谱法（ICP-MS）检测了在三种不同pH值的唾液样介质中，Co-Cr-Mo牙科合金的DMLS样品和铸造（CM）样品中金属洗脱的差异。所得结果表明，DMLS合金在人工唾液中的金属洗脱量低于CM合金。在整个30天的研究期间，无论是DMLS合金还是CM合金，所有研究的金属离子的释放都受酸度影响。铸造合金的酸度从pH 6.8变为pH 2.3时，CM合金中Co、Cr和Mo的洗脱增加量高于DMLS合金。对于两种测试合金，Co、Cr和Mo中释放量最大的是Co。此外，所有离子在pH 2.3时释放量最大。在pH 2.3和pH 4.5的唾液中，研究时间越长，CM合金和DMLS合金总金属离子释放量的差异就越大。根据ISO定义，在所有研究的酸性环境中，两种合金的洗脱水平均处于安全范围。
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