Faraji Foad, Heshmat Haleh, Banava Sepideh
Department of Restorative, School of Dentistry, Islamic Azad University, Tehran, Iran.
J Conserv Dent. 2017 Jul-Aug;20(4):260-263. doi: 10.4103/JCD.JCD_83_16.
EQUIA is a new gastrointestinal (GI) system with high compressive strength, surface microhardness (MH), and fluoride release potential. This study aimed to assess the effect of aging and type of protective coating on the MH of EQUIA GI cement.
A total of 30 disc-shaped specimens measuring 9 mm in diameter and 2 mm in thickness were fabricated of EQUIA GI and divided into three groups of G-Coat nanofilled coating (a), no coating (b) and margin bond (c). The Vickers MH value of specimens was measured before (baseline) and at 3 and 6 months after water storage. Data were analyzed using repeated measures ANOVA.
Group B had significantly higher MH than the other two groups at baseline. Both G-Coat and margin bond increased the surface MH of GI at 3 and 6 months. The MH values of G-Coat and margin bond groups did not significantly increase or decrease between 3 and 6 months.
The increase in MH was greater in the G-Coat compared to the margin bond group in the long-term. Clinically, margin bond may be a suitable alternative when G-Coat is not available.
EQUIA是一种新型胃肠（GI）系统，具有较高的抗压强度、表面显微硬度（MH）和氟释放潜力。本研究旨在评估老化和保护涂层类型对EQUIA GI水门汀显微硬度的影响。
用EQUIA GI制作了30个直径9 mm、厚度2 mm的圆盘形试件，并分为三组：G-Coat纳米填料涂层组（a）、无涂层组（b）和边缘粘结组（c）。在试件储存水之前（基线）以及储存3个月和6个月后测量其维氏显微硬度值。使用重复测量方差分析对数据进行分析。
在基线时，B组的显微硬度显著高于其他两组。G-Coat组和边缘粘结组在3个月和6个月时均提高了GI的表面显微硬度。G-Coat组和边缘粘结组的显微硬度值在3个月至6个月之间没有显著增加或减少。
从长期来看，G-Coat组的显微硬度增加幅度大于边缘粘结组。临床上，当没有G-Coat时，边缘粘结可能是一种合适的替代方法。
