Oguz Ahmet Serra, Mutluay M Murat, Seyfioglu Polat Zelal, Seseogullari Dirihan Roda, Bek Bulent, Tezvergil-Mutluay Arzu
Medipol University, Faculty of Dentistry, Department of Prosthodontics , Turkey.
Acta Odontol Scand. 2014 Nov;72(8):831-8. doi: 10.3109/00016357.2014.913307. Epub 2014 May 14.
The clinical survival rates of the adhesive restorations are limited due to the deterioration of resin-dentin bonds over time, partly due to the endogenous enzymatic activity of dentin. Recently, benzalkonium chloride (BAC) has been shown to effectively inhibit endogenous protease activity of dentin. This study evaluated the effect of different concentrations of benzalkonium chloride (BAC) on the degree of conversion (DC), vickers hardness (VH), setting time (ST) and biaxial flexural strength (FS) of two self-adhesive resin luting cements (RC).
Two RC SpeedCEM (Ivoclar-Vivadent) and BisCem (Bisco) were modified by addition of 0.1, 0.5, 1, 1.5, 2 wt% BAC. The luting cements without the addition of BAC served as control. The DC (FT-IR/ATR from the bottom of the resin disc), vickers hardness (from top and bottom of the light-cured specimen), setting time (ISO 4049) and biaxial flexural strength (0.6 × 6 mm discs) of the specimens were tested. Data were analyzed using ANOVA and Tukeys HSD.
DC results were in the range of 70-80%, with some significant changes in BisCem (p < 0.05). VH values of both materials increased significantly compared to control, with no significant change as the BAC percentage increases. BAC addition influenced the ST differently for both materials. For BisCem, a gradual decrease (p < 0.05) was observed whereas, for SpeedCEM, a gradual increase was observed until 1% BAC (p < 0.05). For FS values, a gradual decrease was observed for both materials with increased amounts of BAC (p < 0.05), compared to the control group.
BAC addition of up to 1% seems to be acceptable considering the properties tested. Clinical significance. Incorporation of benzalkonium chloride to self-adhesive resin luting cements during the mixing procedure does not significantly affect the degree of conversion or flexural strength of the luting agent and may be a good option to improve the durability of adhesive interface.
由于树脂 - 牙本质粘结随着时间推移而恶化，部分原因是牙本质的内源性酶活性，粘结修复体的临床存活率有限。最近，已证明苯扎氯铵（BAC）可有效抑制牙本质的内源性蛋白酶活性。本研究评估了不同浓度的苯扎氯铵（BAC）对两种自粘结树脂水门汀（RC）的转化率（DC）、维氏硬度（VH）、凝固时间（ST）和双轴弯曲强度（FS）的影响。
通过添加0.1、0.5、1、1.5、2 wt%的BAC对两种RC（SpeedCEM（义获嘉 - 伟瓦登特公司）和BisCem（必思科公司））进行改性。未添加BAC的水门汀用作对照。测试了样本的DC（从树脂盘底部进行傅里叶变换红外光谱/衰减全反射法）、维氏硬度（从光固化样本的顶部和底部）、凝固时间（ISO 4049）和双轴弯曲强度（0.6×6毫米圆盘）。使用方差分析和Tukey's HSD检验对数据进行分析。
DC结果在70 - 80%范围内，BisCem中有一些显著变化（p < 0.05）。与对照相比，两种材料的VH值均显著增加，随着BAC百分比增加无显著变化。添加BAC对两种材料的ST影响不同。对于BisCem，观察到逐渐降低（p < 0.05），而对于SpeedCEM，观察到直到1% BAC时逐渐增加（p < 0.05）。对于FS值，与对照组相比，随着BAC含量增加，两种材料均观察到逐渐降低（p < 0.05）。
考虑到所测试的性能，添加高达1%的BAC似乎是可接受的。临床意义。在混合过程中将苯扎氯铵加入自粘结树脂水门汀中不会显著影响水门汀的转化率或弯曲强度，并且可能是提高粘结界面耐久性的一个良好选择。
