Tappe A, Kubisch V, Schneider S
Abteilung für Biomaterialforschung und medizinische Werkstoffkunde, Medizinische Fakultät (Charité), Humboldt-Universität, Berlin.
Schweiz Monatsschr Zahnmed. 1992;102(12):1467-72.
Resistance against abrasion of premolar plastic teeth on their chewing surfaces was determined using an in vitro test method which approximately simulated oral conditions, as well as contact between antagonists, chewing pressure, biting pressure and chewing motion. The humpy surface of commercially manufactured teeth was levelled by grinding, using the abrasion test machine itself, which resulted in two little plain surfaces. After measuring the size of these surfaces, wear due to abrasion was determined by loss of weight. The commercial products showed different resistances against abrasion, the teeth of Dens-Nobilis and Vitapan, which contain amorphous silica, appeared to be more resistant against abrasion than IPN (Artiplus) and PMMA (Keracryl-7, Planustar, SR-Orthotyp-PE) teeth. Unexpectedly, IPN teeth did not show a higher resistance against abrasion than the PMMA teeth, which were tested in this investigation. Only SR-Orthotyp-PE were significantly worse. Under the prevailing test conditions SR-Orthosit-PE teeth are very little resistant against abrasion, although they contain amorphous silica. Investigations with a raster electron microscope revealed that they are too brittle.
采用一种体外试验方法测定了前磨牙塑料牙咀嚼面的耐磨性，该方法大致模拟了口腔环境以及拮抗牙之间的接触、咀嚼压力、咬合力和咀嚼运动。使用磨损试验机本身通过研磨将市售牙齿的凹凸表面磨平，得到两个小的平整表面。在测量这些表面的尺寸后，通过重量损失确定磨损量。商业产品表现出不同的耐磨性，含有无定形二氧化硅的Dens-Nobilis和Vitapan牙齿似乎比IPN（Artiplus）和PMMA（Keracryl-7、Planustar、SR-Orthotyp-PE）牙齿更耐磨。出乎意料的是，在本研究中测试的IPN牙齿的耐磨性并不比PMMA牙齿高。只有SR-Orthotyp-PE明显更差。在当前的测试条件下，SR-Orthosit-PE牙齿尽管含有无定形二氧化硅，但耐磨性很差。用光栅电子显微镜进行的研究表明它们太脆了。
