Liebermann Anja, Ilie Nicoleta, Roos Malgorzata, Stawarczyk Bogna
Department of Prosthodontics, Dental School, Ludwig-Maximilians University, Munich - Germany.
Department of Operative/Restorative Dentistry, Periodontology and Pedodontics, Dental School, Ludwig-Maximilians University, Munich - Germany.
J Appl Biomater Funct Mater. 2017 Jul 27;15(3):e206-e214. doi: 10.5301/jabfm.5000362.
The aim of this study was to investigate the effects of storage medium and aging duration on Martens hardness (HM) and indentation modulus (EIT) of self-adhesive resin-based cements (SARCs).
A total of 416 discs were fabricated from 8 SARCs (n = 52 per SARC): (i) BeautyCem (BEA), (ii) Bifix SE (BIF), (iii) Clearfil SA Cement Automix (CLE), (iv) RelyX Unicem2 Automix (RXU), (v) SeT (SET), (vi) SmartCem 2 (SMC), (vii) SoloCem (SOC) and (viii) SpeedCEM (SPC). The specimens were ground and stored in (a) physiological saliva, (b) artificial saliva, (c) sodium chloride and (d) distilled water, at 37°C for 1, 7, 14, 28, 90 and 180 days. Non-aged specimens (3 hours after photo-initiation) of each SARC acted as control groups. HM and EIT were assessed using a universal hardness testing machine. Data were analyzed using Kolmogorov-Smirnov and Kruskal-Wallis tests and paired t-test, and 3-, 2- and 1-way ANOVA with post hoc Scheffé test (p<0.05).
SARC materials exerted the highest influence on HM and EIT values (p<0.001, partial eta squared [ηP²] = 0.753 and 0.433, respectively), closely followed by aging duration (p<0.001, ηP² = 0.516 and 0.255) and storage medium (p<0.001, ηP² = 0.043 and 0.033). The interaction effect of the combinations of the 3 independent parameters was also significant (p<0.001, ηP² = 0.163 and 0.133). The lowest initial HM and EIT was presented by CLE, followed by SET and SPC; highest HM was for BIF, followed by RXU and SMC. SET gave a greater HM and EIT percentage decrease than SOC, SPC, BEA, SMC, RXU or CLE.
Aging duration is a major factor affecting the micromechanical properties of SARCs, while storage medium was shown to have a significant but minor role.
本研究旨在探讨储存介质和老化时间对自粘树脂基水门汀（SARC）的马氏硬度（HM）和压痕模量（EIT）的影响。
用8种SARC制备了总共416个圆盘（每种SARC有52个）：（i）美塑树脂水门汀（BEA），（ii）Bifix SE（BIF），（iii）Clearfil SA Cement Automix（CLE），（iv）RelyX Unicem2 Automix（RXU），（v）SeT（SET），（vi）SmartCem 2（SMC），（vii）SoloCem（SOC）和（viii）SpeedCEM（SPC）。将样本研磨后，在37°C下分别储存在（a）生理唾液、（b）人工唾液、（c）氯化钠和（d）蒸馏水中1、7、14、28、90和180天。每种SARC的未老化样本（光引发后3小时）作为对照组。使用万能硬度试验机评估HM和EIT。数据采用Kolmogorov-Smirnov检验、Kruskal-Wallis检验和配对t检验进行分析，并采用带有事后Scheffé检验的三因素、二因素和单因素方差分析（p<0.05）。
SARC材料对HM和EIT值的影响最大（p<0.001，偏η²分别为0.753和0.433），其次是老化时间（p<0.001，η²为0.516和0.255）和储存介质（p<0.001，η²为0.043和0.033）。这3个独立参数组合的交互作用也很显著（p<0.001，η²为0.163和0.133）。CLE的初始HM和EIT最低，其次是SET和SPC；BIF的HM最高，其次是RXU和SMC。与SOC、SPC、BEA、SMC、RXU或CLE相比，SET的HM和EIT百分比下降幅度更大。
老化时间是影响SARC微观力学性能的主要因素，而储存介质的作用虽显著但较小。
