Hassan Manar A, Zinelis Spiros, Hersberger-Zurfluh Monika, Eliades Theodore
Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece.
Materials (Basel). 2019 Feb 21;12(4):646. doi: 10.3390/ma12040646.
The aims of this study were twofold: a) to characterize a wide array of time-independent and -dependent properties and b) to find possible correlations among the properties tested. Seven commercially available orthodontic adhesives were included in this study and ten cylindrical specimens were prepared from each material. Five specimens from each material were used for the characterization of Martens Hardness (HM), indentation modulus (E), and elastic index (η), and the remaining five for the determination of indentation creep (C). Al the aforementioned properties were identified by employing an Instrumented Indentations Testing (IIT) device with a Vickers indenter. The results of HM, E, η, and C were statistically analyzed by one way ANOVA and Tukey post hoc test, while the possible correlations among the aforementioned properties were determined by Spearman correlation test. Statistical significant differences were identified for all properties among the materials tested. Spearman correlation reveals that HM has a positive correlation with E. Both properties demonstrated a negative correlation with η and C, while no correlation was identified between η and C. Significant differences in the mechanical properties tested may also imply differences in their clinical behavior and efficacy.
a）表征一系列与时间无关和与时间有关的特性；b）找出所测试特性之间可能存在的相关性。本研究纳入了七种市售正畸粘合剂，每种材料制备了十个圆柱形试样。每种材料的五个试样用于表征马氏硬度（HM）、压痕模量（E）和弹性指数（η），其余五个用于测定压痕蠕变（C）。所有上述特性均通过使用配备维氏压头的仪器化压痕测试（IIT）装置来确定。通过单因素方差分析和Tukey事后检验对HM、E、η和C的结果进行统计学分析，同时通过Spearman相关检验确定上述特性之间可能存在的相关性。在所测试的材料之间，所有特性均存在统计学显著差异。Spearman相关性表明，HM与E呈正相关。这两个特性均与η和C呈负相关，而η和C之间未发现相关性。所测试机械性能的显著差异也可能意味着它们在临床行为和疗效方面存在差异。
