Zinelis Spiros, Eliades Theodore, Eliades George, Makou Margarita, Silikas Nikolaos
Department of Biomaterials, Section of Basic Sciences and Oral Biology, School of Dentistry, University of Athens, Athens, Greece.
Dent Mater. 2005 Sep;21(9):890-4. doi: 10.1016/j.dental.2005.03.007.
The purpose of this study was to assess critical properties of orthodontic aesthetic bracket materials.
Samples of polycarbonate, poly(oxy)methylene, ultra high molecular weight polyethylene (UHMWPE), and polycrystalline alumina raw material used from bracket manufacturing were subjected to: (a) profilometry for the determination of Ra, Rq, Rmax and Rz roughness parameters; (b) Vickers hardness (HV50) testing; and (c) wear resistance determined by the scratch test. The results were analyzed with one-way ANOVA and Tukey multiple comparisons test at alpha=0.05 level of significance.
The UHMWP and alumina specimens showed the highest roughness values for all parameters. The highest hardness, amongst the polymeric raw materials, was obtained from the poly(oxy)methylene appliances. Differences were also noted between the polycarbonate raw material of different manufacturers implying an effect from the manufacturing process. With the exception of alumina, the highest wear resistance was found for the poly(oxy)methylene specimens.
The results of this study reveal the variability among aesthetic plastic bracket raw materials, their reduced hardness and wear resistance relative to alumina as well as the inappropriateness of UHMWPE as alternative bracket material.
本研究旨在评估正畸美学托槽材料的关键性能。
对托槽制造中使用的聚碳酸酯、聚甲醛、超高分子量聚乙烯（UHMWPE）和多晶氧化铝原材料样本进行以下测试：（a）轮廓仪测量以确定Ra、Rq、Rmax和Rz粗糙度参数；（b）维氏硬度（HV50）测试；（c）通过划痕试验测定耐磨性。结果采用单因素方差分析和Tukey多重比较检验进行分析，显著性水平α = 0.05。
UHMWP和氧化铝样本在所有参数上显示出最高的粗糙度值。在聚合物原材料中，聚甲醛器具的硬度最高。不同制造商的聚碳酸酯原材料之间也存在差异，这意味着制造工艺有影响。除氧化铝外，聚甲醛样本的耐磨性最高。
本研究结果揭示了美学塑料托槽原材料之间的变异性、它们相对于氧化铝的硬度和耐磨性降低，以及UHMWPE作为替代托槽材料的不合适性。
