背景:与牙髓封闭剂结合的Gutta-percha(GP)仍然是最广泛用于三维闭塞的核心材料。密封剂充当GP和牙根牙本质壁之间的粘合剂。然而,GP芯材料的主要缺点之一是缺乏对密封剂的粘附性。ZnO薄膜由于其相当大的结合强度而具有许多显著的特性,良好的光学质量,和优秀的压电,抗菌,和抗真菌特性,在各个领域提供许多潜在的应用。本研究旨在探讨纳米结构ZnO薄膜的GP表面功能化对其与牙髓密封剂粘附性的影响。
方法:将常规GP样品随机分成三组:(a)未处理的GP(对照);(b)用氩等离子体(PT)处理的GP;(c)官能化的GP(PT,随后是ZnO薄膜沉积)。GP的表面功能化包括一个多步骤的过程。首先,低压氩气PT用于修饰GP表面,然后通过磁控溅射沉积ZnO薄膜。使用SEM和水接触角分析评估表面形态。进一步的综合测试包括拉伸粘合强度评估,评估Endoresin和AHPlus生物陶瓷密封剂对GP的附着力。使用ANOVA程序进行数据统计分析。
结果:ZnO薄膜再现了PT产生的下层表面形貌。与对照相比,ZnO薄膜沉积降低了水接触角(p<0.001)。内皮树脂显示出统计学上高于AH+生物陶瓷的平均粘结强度值(p<0.001)。对照和ZnO官能化GP之间存在统计学上的显着差异(p=0.006),后者表现出最高的平均粘结强度值。
结论:纳米结构ZnO薄膜在GP表面上的沉积诱导了向亲水性的转变以及GP对Endoresin和AH生物陶瓷密封剂的粘附性增加。
BACKGROUND: Gutta-percha (GP) combined with an endodontic sealer is still the core material most widely used for tridimensional obturation. The sealer acts as a bonding agent between the GP and the root dentinal walls. However, one of the main drawbacks of GP core material is the lack of adhesiveness to the sealer. ZnO thin films have many remarkable features due to their considerable bond strength, good optical quality, and excellent piezoelectric, antibacterial, and antifungal properties, offering many potential applications in various fields. This study aimed to explore the influence of GP surface\'s functionalization with a nanostructured ZnO thin film on its adhesiveness to endodontic sealers.
METHODS: Conventional GP samples were divided randomly into three groups: (a) Untreated GP (control); (b) GP treated with argon plasma (PT); (c) Functionalized GP (PT followed by ZnO thin film deposition). GP\'s surface functionalization encompassed a multi-step process. First, a low-pressure argon PT was applied to modify the GP surface, followed by a ZnO thin film deposition via magnetron sputtering. The surface morphology was assessed using SEM and water contact angle analysis. Further comprehensive testing included tensile bond strength assessment evaluating Endoresin and AH Plus Bioceramic sealers\' adhesion to GP. ANOVA procedures were used for data statistical analysis.
RESULTS: The ZnO thin film reproduced the underlying surface topography produced by PT. ZnO thin film deposition decreased the water contact angle compared to the control (p < 0.001). Endoresin showed a statistically higher mean bond strength value than AH Plus Bioceramic (p < 0.001). There was a statistically significant difference between the control and the ZnO-functionalized GP (p = 0.006), with the latter presenting the highest mean bond strength value.
CONCLUSIONS: The deposition of a nanostructured ZnO thin film on GP surface induced a shift towards hydrophilicity and an increased GP\'s adhesion to Endoresin and AH Bioceramic sealers.